| [effect of magnetic field on peroxidase activation and isozyme in leymus chinensis]. | this paper studied the effect of extra magnetic field and saline-alkali stress on the seedling growth of leymus chinensis. the results showed that magnetic field treatment not only improved the seedling growth of l. chinensis, but also enhanced its saline-alkali tolerance. this treatment also increased its peroxidase(pod) activity, and induced an extra pod isozymic band on electropherogram. according to a comprehensive analysis, 300 mt and 200 mt for 10 minutes were determined as the optimum mag ... | 2000 | 11767524 |
| [effects of ca2+, aba and h3po4 on relaxing stress of na2co3 and nacl]. | two groups of aneurolepidium chinense seedlings were stressed by 300 mmol.l-1 nacl and 100 mmol.l-1 na2co3, respectively and the effect of aba, ca2+ and h3po4 on relaxing their stress was studied. the results show that external ca2+, aba and h3po4 could obviously mitigat the inhibitory effect of nacl and naco3 on seedling growth. in the treatment of na2co3, praying it on leaves had a better effect than root-irrigating, while in the treatment of nacl, there was no significant difference. the effe ... | 2000 | 11767566 |
| [effect of grazing on reproduction in leymus chinensis population]. | the experiment on the effect of grazing on the asexual and sexual reproduction and biomass allocation in leymus chinensis population was conducted in songnen grassland. the results show that animal grazing reduced both asexual and sexual reproductive channels. with the increase of grazing intensity, the densities of asexual shoots and rhizome tillers, seed biomass, numbers of seeds per inflorescence and sexual shoot ratio decreased significantly, especially after heavy grazing. the rates of biom ... | 2000 | 11767641 |
| [comparative study on clonal and sexual reproductive traits of leymus chinensis populations in different habitats]. | the variations of clonal and reproductive traits between four leymus chinensis populations in different habitats were studied on northeast grasslands of china. the results showed that significant differences existed among leymus chinensis populations in both clone traits (vegetative shoot densities and tiller densities) and sexual reproduction traits (reproductive shoot densities, reproductive shoot differentiation and reproductive effects), primarily due to the habitat heterogeneity of sites, e ... | 2001 | 11758417 |
| [effect of grazing rate on biomass and element composition of xanthoparmelia camtschadalis]. | xanthoparmelia camtschadalis is widely distributed in grassland area of mongolian plateau. there are few studies on the relationships between biomass, element composition and stocking rate. the relationships of biomass and element composition of xanthoparmelia camtschadalis to grazing rates in leymus chinensis steppe in inner mongolia were investigated. the results indicated that the biomass of the lichen was highest under light grazing, while the lowest under extremely overgrazing treatment. th ... | 2001 | 11758415 |
| [characteristics and quantitative simulation of stomatal conductance of aneurolepidium chinense]. | based on field measurements of stomatal conductance and photosynthesis of aneurolepidium chinense, the dynamic characteristics and the relationship between stomatal conductance and environmental conditions were examined to develop a leaf stomatal conductance model for a. chinense. the results showed that the variation of stomatal conductance of a. chinense was closely correlated with environmental factors, such as physiologically active radiation (par), vapor pressure deficit (vpd) and air tempe ... | 2001 | 11758373 |
| [energy allocation to growth and reproduction in leymus chinensis population]. | studies on energy allocation to growth and reproduction in leymus chinensis population show that the average calorific value of modulus was decreased in the order of ear > leaf sheath of vegetative shoot > leaf sheath of sexual shoot > leaf of vegetative shoot > stem of vegetative shoot > stem of sexual shoot > leaf of sexual shoot > litter, and the energy allocation rate of vegetative and reproductive growth was in the order of vegetative shoot > rhizome > litter > sexual shoot. the dynamics of ... | 2000 | 11767684 |
| [analysis on ecophysiological characteristics of leaf photosynthesis of aneurolepidium chinense in songnen grassland]. | a series of physiological characteristics of leaf photosynthesis and environmental factors are measured on aneurolepidium chinense in songnen salinized grassland during the growth season. the results showed that the daily change pattern of net photosynthetic rate (pn) of aneurolepidium chinense could be expressed as a two-humped curve, the daily change pattern of transpiration rate is one-humped curve. in addition, net photosynthetic rate (pn), transpiration rate (e) and stomatal resistance (rs) ... | 2001 | 11813438 |
| intra-specific variations of two leymus chinensis divergence populations in songnen plain, northeast china. | population demography, seed production, biomass allocation, net photosynthesis and transpiration of two leymus chinensis divergent populations and between two years in songnen plain, northeast china were compared. strong differences between the dry 1997 and moist 1998 occurred in vegetative shoot and sexual shoot densities, sexual differentiation and tiller densities, as well as in the lengths of inflorescence, seed numbers per inflorescence, seed weights and biomass allocation in each populatio ... | 2002 | 11887313 |
| [analysis on competition and coexistence patterns of aneurolepidium chinense and its main companion species]. | in this study, transects were set in areas where aneurolepidium chinense and its companion species grew together. competition and coexistence patterns of these species in the ecotone were analyzed using the following measures:frequency distribution, spatial pattern, and pattern intensity. patterns of a. chinense and its main companion species were diverse. aggregation was the tactics for a. chinense to defend the foreign species' invading or disperse itself. there existed competition and coexist ... | 2002 | 11962319 |
| [comparison of leaf tissue turnover for leymus chinensis and phragmites communis after grazing]. | leaf tissue turnover of leymus chinensis and phragmites communis after grazing was studied by application of theory and method of tissue turnover in this paper. the results showed that the number of living leaf of p. communis was larger than that of l. chinensis, but the length of living leaf of l. chinensis was larger than that of p. communis during the whole growth period. both of the leaf appearance rate and the leaf elongation rate of l. chinensis and p. communis were largest at first, and t ... | 2002 | 12181899 |
| [soil catalase activity of main plant communities in leymus chinensis grassland in northeast china]. | the seasonal dynamics of soil catalase activity of three different plants communities in leymus chinensis grassland in northeast china were in a parabolas shape. the seasonal variation of chloris virgata community was greater than those of leymus chinensis community and puccinellia tenuiflora community, and "seed effect" might be the main reason. the correlation between the activity of soil catalase in different soil layers and environmental factors were analyzed. the results showed that the act ... | 2002 | 12216391 |
| [rapd method for the identification of intergeneric asymmetric somatic hybrid plants of wheat]. | randomly amplified polymorphic dna (rapd) method was used to identify the hybrid nature of three kinds of intergeneric asymmetric somatic hybrid plants of wheat: wheat (triticum aestivum) + haynaldia villosa, wheat + leymus chinensis and wheat + agropyron elongatum. it was shown from the electrophoresis profiles that the genome of somatic hybrid plants contained specific section genome of both parents after dna amplification with arbitrary primers. a specific rapd product (dna fragment of 0.77 k ... | 1999 | 12548808 |
| [physiological response of two divergent leymus chinensis types to drought stress in the songnen plain]. | the physiological response of two divergent leymus chinensis types (grey-green type and yellow-green type) to drought stress was studied by pot experiment. at seedling stage, some physiological indexes of the plants and leaves were measured by taking the divergent types under stress of polyethylene glycol (peg). quantitative analyses showed that under drought stress, the electrolyte leakage rate, proline content, water content, fresh weight, and so(4)2- and no3- contents of two divergent types v ... | 2002 | 12561172 |
| [biomass allocation and growth analysis on the ramets of phragmites communis populations in different habitats in the songnen plains of china]. | in the songnen plains of china, the reeds grow fastest in middle august. in this experiment, four research plots were chosen in the arid habitats. the first plot was dominated by reed, and in which, there was some stagnant water in july and august. the ramets of reeds grew singly, and most of them could turn into reproductive growth. its community coverage was more than 95% after the fast growing season of july. the second plot was leymus chinensis + phragmites communis community, where soil was ... | 2003 | 12722434 |
| [relationship between modular growth characteristics of five plant species and water and heat combination in warm-temperate and moderate-temperate steppes]. | applying comparative study on the characteristics of modular growth of five mutual species such as stipa grandis, leymus chinensis, cleistogenes squorrosa, lespedeza dahurica and heteropappus altaicus, the grey-correlative analyses between the demographic growth analysis indexes and average temperature, precipitation and moisture had been carried out during months of the growth seasons from 1999 to 2000 in research stations of warm-temperate and moderate-temperate steppes of inner mongolia. the ... | 2003 | 12722436 |
| [structure of the clone populations of leymus chinensis under different utilization conditions in the xiliao river plains]. | according to the field investigation in the natural grassland of the xiliao river plains, the tillers belonged to four or three age classes, and the rhizomes belonged to four age classes under different disturbance habitats. the numbers of the potential populations composed of winterness seedlings and buds were dominant in the first age class. winterness seedlings belonged to three age classes, while buds belonged to four age classes under all disturbance habitats. the age structure of the poten ... | 2003 | 12836563 |
| [biogeochemical characteristics of nutrient elements in ungrazed grassland ecosystem in xilin river basin]. | the biogeochemical characteristics of nutrient elements in leymus chinensis community and stipa grandis community, which were both scarcely disturbed by human activities, in xilin river basin, inner mongolia were studied. the results showed that the storage of n, p, k, s, ca, mg, and si in the soil compartment of soil-plant system was higher than that in the plant subsystem of two communities, and their storage in the live shoots compartment was lower than that in the litter compartment. the dis ... | 2003 | 12827874 |
| [effect of prescribed burning on grassland nitrogen gross mineralization and nitrification]. | the seasonal dynamics of nitrogen gross mineralization, nitrification, and mineral nitrogen consumption rates in burned and unburned leymus chinensis grasslands were studied with 15n pool dilution technique. the results indicated that the gross mineralization and nitrification rates in burned area were higher than those in unburned area in april and may, and lower than those in unburned area in september. nh4(+)-n consumption rates were higher than unburned area in april and may, and lower in se ... | 2003 | 12827875 |
| [energy accumulation and allocation of main plant populations in aneurolepidium chinense grassland in songnen plain]. | the calorific value of plants is dependent on their biological characteristics and energy-containing materials. the allocation of calorific value in different organs of aneurolepidium chinese, calamagrostic epigejos, puccinellia tenuiflora and chloris virgata was inflorescence > leaf > stem > dead standing. the seasonal dynamics of standing crop energy of aboveground part of four plant populations showed single-peak curve, and the energy production was aneurolepidium chinense > calamagrostic epi ... | 2003 | 12924118 |
| [responses of interspecific relationships among main herbaceous plants to flooding disturbance in songnen plain, northeastern china]. | to investigate the effects of flooding disturbance on the interspecific relationships among grassland plant species, a comparatively thorough study was conducted on sanjiadian national rangeland in the territory of da'an city, jilin province, which was partly flooded in 1998. the study site was located in the south of songnen plain, northeastern china, dominated by leymus chinensis grassland. along the flooding gradients (from un-flooded to heavily flooded) formed on an extensive mild slope take ... | 2003 | 12973991 |
| pollen dispersion, pollen viability and pistil receptivity in leymus chinensis. | leymus chinensis is an economically and ecologically important grass that is widely distributed across eastern areas of the eurasian steppe. a major problem facing its propagation by man is its low sexual reproductivity. the causes of low fecundity are uncertain, largely because many aspects of the reproductive biology of this species remained unknown or incomplete. this study aims to address some of these issues. | 2004 | 14744707 |
| [effect of flooding disturbance on aboveground biomass of leymus chinensis grassland--a preliminary study]. | to investigate the effect of flooding disturbance on the net primary productivity of songnen steppe, a comparatively thorough study was conducted on sanjiadian state-owned rangeland in da'an city, jilin province, which was partly flooded in 1998. the study site was located in the south songnen plain of northeastern china, dominated by leymus chinensis grassland. an extensively mild slope with flooding gradients (from un-flooded to heavily flooded) was taken as the study site. two flooded transec ... | 2003 | 15031908 |
| [module structure of leymus chinensis clones under cultivated condition in songnen plains of china]. | leymus chinensis is a perennial rhizome grass, a species of typical clonal plant. in the songnen plains of china, the ramets of the clone consist of tillers and seedlings under cultivated condition during the last stage of growing season. the tillering nodes of the ramets could propagate four generations, with enough growing space and no interspecies competition in the sandy soil habitats during a growing season. according to the vegetative reproductive generations of tillering nodes, the age sp ... | 2003 | 14997630 |
| [variations of water-soluble carbohydrate and nitrogen contents in leymus chinensis and phragmites communis under different stocking rates]. | the variations of the contents of water-soluble carbohydrate and nitrogen in l. chinensis and ph. communis under different stocking rates were studied by fencing grazing experiment on l. chinensis grassland. the results indicated that the water-soluble carbohydrate content in the base stem of l. chinensis and ph. communis was the lowest (7.12% and 3.95%, respectively) at the beginning of growth period, and then increased gradually with seasons. there was no significant variation in the content o ... | 2003 | 15031909 |
| [physiological response to salt-alkali stress in experimental populations in two ecotypes of leymus chinensis in the songnen plains of china]. | the comparative study of physiological reaction to salt, alkali and mixed salt stresses in two ecotypes of grey-green and yellow-green of leymus chinensis were made. at the stage of seedling, the content of chlorophyll and the leakage rate of electrolyte of leaves, free proline, na/k of tillers were determined in planting containers with sands in two ecotypes by stress of salt, alkali and mixed salt of different concentrations. the results of quantitative analysis showed that the relationships b ... | 2003 | 14997629 |
| [analyses of the correlation between the fluxes of co2 and the distribution of c & n in grassland soils]. | using static dark enclosed chamber technique, the emissions of co2 from typical temperate grasslands such as stipa baicalensis, leymus chinensis, stipa grandis and stipa krylovii in xilin river basin of inner mongolia were measured. and the contents of organic carbon and total nitrogen in different soil layers were also studied to analyze the correlation between the emissions of co2 and the contents of c & n. the results showed that the emissions of co2 from the 4 grassland communities were sign ... | 2004 | 15202225 |
| [effect of restorative measures on quantitative characters of reproduction for leynrus chinensis population in the degenerated grassland]. | studies on the reproductive characters of leymus chinensis population in two plots showed that the density of l. chinensis population declined significantly in plowing plot, while the density of reproductive tillers varied insignificantly. the reproductive tiller had longer ear, longer inter-node, higher ratio of reproductive growth, higher seeding percentage, more ear-nodes, more spikelets, more florets and grains in plowing plot than in enclosing plot. the grain yield, net weight of grain, and ... | 2004 | 15320401 |
| responses of chlorophyll fluorescence and nitrogen level of leymus chinensis seedling to changes of soil moisture and temperature. | controlled experiment of leymus chinensis seedlings grown in the environmental growth chambers at 3 soil moisture levels and 3 temperature levels was conducted in order to improve the understanding how leaf photosynthetic parameters will respond to climatic change. the results indicated that soil drought and high temperature decreased the photochemical efficiency of photosystem (fv/fm), the overall photochemical quantum yield of psii(yield), the coefficient of photochemical fluorescence quenchin ... | 2004 | 15495977 |
| effects of environmental factors on n2o emission from and ch4 uptake by the typical grasslands in the inner mongolia. | the fluxes of n2o emission from and ch4 uptake by the typical semi-arid grasslands in the inner mongolia, china were measured in 1998-1999. three steppes, i.e. the ungrazed leymus chinensis (lc), the moderately grazed leymus chinensis (lc) and the ungrazed stipa grandis (sg), were investigated, at a measurement frequency of once per week in the growing seasons and once per month in the non-growing seasons of the lc steppes. in addition, four diurnal-cycles of the growing seasons of the lc steppe ... | 2005 | 15571752 |
| a stress-inducible plasma membrane protein 3 (acpmp3) in a monocotyledonous halophyte, aneurolepidium chinense, regulates cellular na(+) and k(+) accumulation under salt stress. | regulation of ion homeostasis is fundamental to physiological activities in plants. here, we report on the functional characterization of acpmp3 [aneurolepidium chinense (a monocotyledonous halophyte) plasma membrane protein 3] under salt stress. expression of acpmp3-1 and acpmp3-2 genes was highly induced by various abiotic stresses, such as salt, cold and drought. furthermore, abscisic acid, h(2)o(2) and salicylic acid also triggered expression of acpmp3 genes. in the deltanha1 deltapmr2 delta ... | 2004 | 15580528 |
| [nuclear and cytoplasmic genome analysis of somatic hybrid of triticum aestivum l. and leymus chinensis (trin.) tzvel]. | intergeneric somatic hybrids were obtained by fusion between protoplasts of triticum aestivum l. cv. jinan 177 and leymus chinensis (trin.) tzvel. protoplasts of l. chinensis were exposed to uv (300 microw/cm(2)) for 30 s, 45 s and 1 min before fusion. the results of morphological and chromosomal observation, isozyme pattern as well as rapd analysis and the 5s rdna space sequence analysis showed the hybrid nature of the regenerated colonies of fusion combination t (+) l (uv 30 s). restriction fr ... | 2004 | 15627685 |
| genetic transformation of leymus chinensis with the pat gene through microprojectile bombardment to improve resistance to the herbicide basta. | chinese leymus [leymus chinensis (trin.) tzvel.] is a perennial grass (tribe gramineae) that is widely distributed throughout northern china and mongolia where it is produced as a forage product. severe production losses due to weed growth have serious economic consequences, and as non-selective herbicides not only kill the weeds but are also harmful to this forage grass, the introduction of a foreign gene for resistance to the herbicide basta is necessary since this species lacks herbicide resi ... | 2005 | 15657763 |
| [changes of four common plant populations growth and their anti-oxidative enzymatic system in desertification process]. | this paper studied the changes of the growth and anti-oxidative enzymatic system of four common plant populations during the desertification process of sandy grassland. the results showed that in the process of desertification, the individual height and density and the density percentage of the populations all had a decreasing trend. the growth of melilotoides ruthenica was more vigorous before moderate desertification (md) stage, but restricted after that. in md stage, the growth of leymus chin ... | 2004 | 15825438 |
| [comparison of clonal architecture between two divergent leymus chinensis types in songnen grassland]. | this paper studied the clonal architecture of two divergent leymus chinensis types (grey-green type and yellow-green type) in songnen grassland, and compared their internode length, spacer length, interbranching length, interbranching angle, and ramet population density and height under the same habitat. the results showed that there was no significant difference in these clonal characteristics except spacer length and ramet population density between the two types of l. chinensis, and yellow-gr ... | 2004 | 15825463 |
| [a comparative study on soil respiration between grazing and fenced typical leymus chinensis steppe, inner mongolia]. | with enclosed chamber method, this paper studied the soil respiration in grazing and fenced typical leymus chinensis steppes, inner mongolia, and its relationships with environmental factors. the results showed that the daily pattern of soil respiration could be expressed as a one-humped curve, and the highest values appeared at 13:00-15:00 in the fenced and grazing plots. the diurnal dynamics of soil respiration mainly depended on the surface temperature at the fenced plots and the soil tempera ... | 2004 | 15669495 |
| [dynamics of nutrient element iron in soil-plant ecosystem of the songnen plain leymus chinensis grassland]. | the study showed that in the soil-plant ecosystem of the songnen plain leymus chinensis grassland, the contents of total and available iron in soil were relatively low, while leymus chinensis was abundant in iron. the concentrations of soil total and available iron decreased with soil depth. soil available iron positively correlated with soil organic matter, while negatively correlated with soil ph. the dynamics of soil total iron showed a "v" curve during the growth season, with the lowest in j ... | 2004 | 15825436 |
| [soil c and n dynamics during desertification of grassland in northern china]. | this paper investigated the aboveground vegetations and the soil texture and total c and n at 75 sites of duolun county in xilinguole league of inner mongolia. the results showed that different types of vegetation community could be used to describe different stages of desertification process. during desertification, the community types were changed in the series of leymus chinensis + cleistogenes squarrosa --> artemisia frigida --> artemisia intramongolia --> corispermum staunyonii, chenopodium ... | 2004 | 15669493 |
| differences in the compensatory growth of two co-occurring grass species in relation to water availability. | we compared the potential for compensatory growth of two grass species from the mongolian steppe that differ in their ability to persist under grazing: the rhizomatous leymus chinensis and the caespitose stipa krylovii, and investigated how this ability might be affected by drought. plants were grown in a greenhouse under wet and dry conditions and subjected to a clipping treatment (biweekly removal of 75-90% of the aerial mass). leymus exhibited a much stronger compensatory growth after clippin ... | 2005 | 16133192 |
| photosynthetic responses of c3 and c4 species to seasonal water variability and competition. | this study examined the impacts of seasonal water variability and interspecific competition on the photosynthetic characteristics of a c3 (leymus chinensis) and a c4 (chloris virgata) grass species. plants received the same amount of water but in three seasonal patterns, i.e. the one-peak model (more water in the summer than in the spring and autumn), the two-peak model (more water in the spring and autumn than in the summer), and the average model (water evenly distributed over the growing seas ... | 2005 | 16203757 |
| [effects of alkali-stress on aneurolepidium chinense and helianthus annuus]. | employing monocotyledon aneurolepidium chinense and dicotyledon helianthus annuus, the two species with high alkali-saline resistance as test materials, and stressing them with neutral, alkalic, and mixed salts, this paper studied the characteristics of various stresses and their interrelations, with relative growth rate (rgr) as the main strain index. the results showed that under the same concentration, alkalic salt had a stronger effect than neutral salt, and the rgr of a. chinense and h. ann ... | 2005 | 16262066 |
| [soil respiration and its influencing factors at grazing and fenced typical leymus chinensis steppe, nei monggol]. | based on two-year soil respiration observing data at fenced and grazing typical leymus chinensis steppe, nei monggol by the enclosed chamber method, soil respiration and its relationships with various affecting factors were analyzed. the major results include: (1) the diurnal and seasonal dynamics of soil respiration are similar at fenced and grazing typical leymus chinensis steppe, but soil respiration rate is larger at the fenced plots than that at the grazing plots, and their values were 219. ... | 2005 | 16447419 |
| [matter production and storage of leymus chinensis clonal populations in restoration succession process of flooded meadow in songnen plain of china]. | in this paper, the tiller matter production and the rhizome matter storage of leymus chinensis clonal populations in the patches with radius of 0.5, 1, 3, 5 and 10 m were studied in the restoration succession process of flooded meadow in songnen plain. the results indicated that in each patch, 1 and 2 age classes had the most tiller matter production, while in the patches except in the center of 10 m patch, the rhizome matter storage of 1 age class was predominant. the proportion of the matter p ... | 2005 | 16515183 |
| combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass leymus chinensis. | drought and high-temperature stresses have been extensively studied; however, little is known about their combined impact on plants. in the present study, we determined the photosynthetic gas exchange, chlorophyll fluorescence, nitrogen level, and lipid peroxidation of the leaves of a perennial grass (leymus chinensis (trin.) tzvel.) subjected to three constant temperatures (23, 29 and 32 degrees c), and five soil-moisture levels (75-80%, 60-65%, 50-55%, 35-40% and 25-30% of field capacity, resp ... | 2006 | 16685524 |
| [growth mechanisms of two ecotype leymus chinensis populations in songnen plain]. | the study showed that there was a power function relationship between weight per tiller and density of two ecotype leymus chinensis populations in songnen plain, and the b value in the function (-0.098 approximately -0.272) was bigger than -1. the biomass and weight per tiller of the two populations increased with their increasing density and height, and the relationships between biomass and density, and between weight per tiller and height were significantly accorded with power or liner functio ... | 2006 | 16689233 |
| [dynamics of soluble sugar and endogenous hormone contents in several steppe grass species during their germination period in spring]. | the study on the dynamics of soluble sugar and endogenous hormone contents in steppe grass species elymus sibiricus, e. rectisetus, leymus chinensis, l. racemosu and stipa krylovii during their germination period in spring showed that high content ga and low content aba played an important role for l. chinensis and l. racemosus germination, and the abundant soluble sugar storage in root made the rhizome grasses germinate earlier and grow stronger. the dynamics of ribosylzeatin was similar with t ... | 2006 | 16706040 |
| [study on the free-grazed steppes root respiration of growing season in the xilin river basin, china]. | in order to determine the proportion of the root respiration to the total soil respiration, field experiments were condusted to measured soil respiration in three temperate grassland communities including leymus chinensis free-grazed steppe, stipa grandis free-grazed steppe and leymus chinensis degenerated free-grazed steppe using root biomass ratiocination method in the growing season, 2005. at the same time, seasonal variation including root respiration, total soil respiration and proportion o ... | 2006 | 17304826 |
| [growth patterns of leymus chinensis clones under different habitat conditions in songnen plain of china]. | a tracking investigation was conducted in the songnen plain of china on the experimental clones of leymus chinensis under cultivation, and the natural clones of this grass in the succession process of vegetation restoration after meadow flooding. the results showed that on aeolian sandy soil where existed enough growth space but no interspecific competition, there was a month interval between the transplanting of two experimental clones, and the sizes of these clones had a one-fold difference by ... | 2006 | 17066695 |
| contribution of root to soil respiration and carbon balance in disturbed and undisturbed grassland communities, northeast china. | changes in the composition of plant species induced by grassland degradation may alter soil respiration rates and decrease carbon sequestration; however, few studies in this area have been conducted. we used net primary productivity (npp),microbial biomass carbon (mbc), and soil organic carbon (soc)to examine the changes in soil respiration and carbon balance in two chinese temperate grassland communities dominated by leymus chinensis (undisturbed community; community 1)and puccinellia tenuiflor ... | 2007 | 17435328 |
| [the application of two-dimensional liquid phase chromatography to separation of total protein of leymus chinensis shoot]. | the total proteins of leymus chinensis were extracted from eight-week-old seedlings grown in the greenhouse by tca-acetone precipitation method. after the lysis buffer was replaced by the start buffer, proteins were fractionated along the first dimension using chromatofocusing (cf). subsequently the fractions with pi values between 8.5 and 4.0 collected after the first dimension separation were further fractionated by nonporous silica reverse-phase high-performance liquid chromatography (nps-rp- ... | 2007 | 17556814 |
| [study of distinguish root respiration from total soil respiration by root exclusion method in the temperate semi-arid grassland in inner mongolia, china]. | in order to determine the possibility of measuring the root respiration by using root exclusion method, we conducted field experiments to measured total soil respiration and net soil respiration in three temperate grassland communities including leymus chinensis free-grazed steppe, stipa grandis free-grazed steppe and leymus chinensis degenerated free-grazed steppe in the growing season, 2005. at the same time, the proportion of the root respiration to the total soil respiration was estimated in ... | 2007 | 17639922 |
| [effects of storage conditions and sowing methods on seed germination of leymus chinensis]. | this paper studied the effects of four storage conditions (dry storage at 4 degrees c, dry storage at room temperature, storage in moist non-saline-alkali soil at 4 degrees c, and storage in moist saline-alkali soil at 4 degrees c), three germination substrates (filter paper, non-saline-alkali soil, and saline-alkali soil), and two sowing methods (sowing on and in the substrates) on the seed germination of leymus chinensis. the results showed that compared with the dry storage at room temperatur ... | 2007 | 17650847 |
| plant nitrogen dynamics and nitrogen-use strategies under altered nitrogen seasonality and competition. | numerous studies have examined the effects of climatic factors on the distribution of c(3) and c(4) grasses in various regions throughout the world, but the role of seasonal fluctuations in temperature, precipitation and soil n availability in regulating growth and competition of these two functional types is still not well understood. this report is about the effects of seasonality of soil n availability and competition on plant n dynamics and n-use strategies of one c(3) (leymus chinensis) and ... | 2007 | 17704500 |
| [seed flows of restoration succession series communities in alkaline meadow of northeast china songnen plain]. | after compared the source seed bank, soil seed bank, and seedling bank of the dominant species in four communities of restoration succession series in alkaline meadow of songnen plain, the model of seed flows was established. at early succession stage, the density of dominant source seed bank in choris virgata community arrived its maximal value 446,182 +/- 180,455 seeds x m(-2) being 7.2 times of that in puccinellia tenuiflora community at intermediate succession stage, 11.4 times of that in p. ... | 2007 | 18062309 |
| different growth responses of c3 and c4 grasses to seasonal water and nitrogen regimes and competition in a pot experiment. | understanding temporal niche separation between c(3) and c(4) species (e.g. c(3) species flourishing in a cool spring and autumn while c(4) species being more active in a hot summer) is essential for exploring the mechanism for their co-existence. two parallel pot experiments were conducted, with one focusing on water and the other on nitrogen (n), to examine growth responses to water or nitrogen (n) seasonality and competition of two co-existing species leymus chinensis (c(3) grass) and chloris ... | 2008 | 18356144 |
| [biomass allocation of leymus chinensis population: a dynamic simulation study]. | based on a greenhouse simulation experiment, this paper studied the dynamics of the above- and below-ground biomass of leymus chinensis populations with four planting densities (120, 240, 360 and 480 plants x m(-2)). the results showed that the above- and below-ground biomass of l. chinensis populations had an increasing trend with the growth, and increased with increasing planting density. however, the relative growth rates (rgrs) of the above- and below-ground biomass did not show significant ... | 2007 | 18333442 |
| [ecohydrological functions of litter in three main plant communities on songnen grassland]. | with the litter layers of leymus chinensis, chloria virgata and puccinellia tenuiflora communities on songnen grassland as test objects, this paper studied their litter storage, water holding capacity, rainfall interception, and restraining effect on soil evaporation. the results showed that in the litter layers of l. chinensis, c. virgata and p. tenuiflora communities, the litter storage was 4.7, 3.0 and 2.6 t x hm(-2), maximum water holding capacity was 9.6, 7.4 and 5.0 t x hm(-2), maximum wat ... | 2007 | 17974235 |
| storage and dynamics of carbon and nitrogen in soil after grazing exclusion in leymus chinensis grasslands of northern china. | land-use change can lead to changes in soil carbon (c) and nitrogen (n) storage. this study aimed to determine the impact of long-term grazing exclusion (ge) on soil organic c and total n (tn) storage in the leymus chinensis grasslands of northern china and to estimate the dynamics of recovery after ge. we investigated the aboveground biomass and soil organic c and tn storage in six contiguous plots along a ge chronosequence comprising free grazing, 3-yr ge, 8-yr ge, 20-yr ge, 24-yr ge, and 28-y ... | 2008 | 18396553 |
| responses of leaf stomatal density to water status and its relationship with photosynthesis in a grass. | responses of plant leaf stomatal conductance and photosynthesis to water deficit have been extensively reported; however, little is known concerning the relationships of stomatal density with regard to water status and gas exchange. the responses of stomatal density to leaf water status were determined, and correlation with specific leaf area (sla) in a photosynthetic study of a perennial grass, leymus chinensis, subjected to different soil moisture contents. moderate water deficits had positive ... | 2008 | 18648104 |
| species-specific response of photosynthesis to burning and nitrogen fertilization. | the present study was conducted to examine photosynthetic characteristics of three dominant grass species (agropyron cristatum, leymus chinensis, and cleistogenes squarrosa) and their responses to burning and nitrogen fertilization in a semiarid grassland in northern china. photosynthetic rate (p(n)), stomatal conductance (g(s)), and water use efficiency (wue) showed strong temporal variability over the growing season. c. squarrosa showed a significantly higher p(n) and wue than a. cristatum and ... | 2008 | 18713424 |
| [effect of red and blue spectrum on photosynthesis physiological characteristics of two ecotypes of leymus chinensis]. | photosynthesis physiological characteristics of two ecotypes of leymus chinensis were studied under different red and blue light excitation by led red and blue lamp-house. photosynthesis did not carry on under red and blue light of 50 micromol x m(-2) x s(-1). when red and blue light intensity was increased, photosynthesis rate, stoma limit value and transpiration rate of the two ecotypes of leymus chinensis were all increased. but photosynthesis rate stopped increasing under red and blue light ... | 2008 | 18844135 |
| enhanced drought tolerance in transgenic leymus chinensis plants with constitutively expressed wheat talea3. | leymus chinensis is an important grassland perennial grass. however, its drought tolerance requires to be improved. lea (late embryogenesis abundant) genes are believed to confer resistance to drought and water deficiency. using agrobacterium-mediated transformation, a wheat lea gene, talea(3), was integrated into l. chinensis. the transgenic lines showed enhanced growth ability under drought stress during which transgenic lines had increased the relative water content, leaf water potential, rel ... | 2009 | 18936880 |
| [net primary productivity of leymus chinensis steppe in xilin river basin of inner mongolia and its responses to global climate change]. | century model was utilized to simulate the annual aboveground net primary production (anpp) of leymus chinensis steppe, a dominant community type in xilin river basin of inner mongolia steppe region. the results showed that the model performed reasonably well in predicting the dynamics of the anpp. the scenario-based simulations indicated that though the variations of air temperature and precipitation due to global climate change as well as the elevated co2 would significantly affect the dynamic ... | 2008 | 19123351 |
| [study on hyper-spectral remote sensing models for monitoring damage of oedaleus asiaticus (orthoptera : acrididae)]. | in the present paper, the asd field spec pro frtm spectroradiometer was used for measuring damages of o. asiaticus in xilin golleague, inner mongolia. first, the hyper-spectral data were analyzed and the canopy reflectance spectral data were compared between the healthy leaves and the infected leaves of leymus chinensis. second, the regression models between the leaf area index (lai) and the hyper-spectral parameters were built, and different varieties of the o. asiaticus damage were used to tes ... | 2009 | 19455813 |
| are plant growth and photosynthesis limited by pre-drought following rewatering in grass? | although the relationship between grassland productivity and soil water status has been extensively researched, the responses of plant growth and photosynthetic physiological processes to long-term drought and rewatering are not fully understood. here, the perennial grass (leymus chinensis), predominantly distributed in the euro-asia steppe, was used as an experimental plant for an irrigation manipulation experiment involving five soil moisture levels [75-80, 60-75, 50-60, 35-50, and 25-35% of s ... | 2009 | 19596698 |
| [effects of plant functional groups removal on the soil carbon, nitrogen pools in a leymus chinensis community of typical steppe in inner mongolia]. | a field plant functional groups (pfgs) removal experiment was conducted in 2005-2007 to study the effects of plant diversity in a leymus chinensis community of typical steppe in inner mongolia on the topsoil (0-10 cm) carbon (c) and nitrogen (n) pools. in the three successive years, the topsoil total c and n contents had a slight change (< 15%). they changed little in 2005, but were significantly higher in 2006 than in 2007 (p < 0.05). the topsoil nh4(+)-n content had a greater inter-annual chan ... | 2009 | 19795637 |
| effect of aridification on the replacement of zonic species, stipa baicalensis roshev., by azonic species, leymus chinensis tzvel., in the steppe of china. | the perennial grass stipa baicalensis is the zonic species in the steppe of china, but is currently being replaced by the azonic species of leymus chinensis. in this area, aridification is on the increase; therefore, we hypothesize that water competition plays a significant role in this succession. the limit of osmotic adjustment in s. baicalensis (13.94%-16.30% peg) was much lower than that in l. chinensis (17.20%-24.50% peg) in response to drought. the synoptic causal model accounted for most ... | 2009 | 19471848 |
| [effects of different managements on soil humic acid structural features in chestnut soil on typical leymus chinensis steppe, inner mongolia, china]. | grazing has a lot of effects on grassland soil properties. the objective of the present study is to investigate the effects of different managements on soil humic acids. soil samples were collected from the surface soil of four adjacent plots ( i , ii , iii and iv) at a long-term experiment site of the inner mongolia grassland ecosystem research station (imgers), the chinese academy of sciences. the structure features of humic acids were investigated by cross-polarization magic angle spinning 13 ... | 2009 | 19810519 |
| water supply changes n and p conservation in a perennial grass leymus chinensis. | changes in precipitation can influence soil water and nutrient availability, and thus affect plant nutrient conservation strategies. better understanding of how nutrient conservation changes with variations in water availability is crucial for predicting the potential influence of global climate change on plant nutrient-use strategy. here, green-leaf nitrogen (n) and phosphorus (p) concentrations, n- and p-resorption proficiency (the terminal n and p concentration in senescent leaves, nrp and pr ... | 2009 | 19903226 |
| [response of phytolith in leymus chinensis to the simulation of global warming and nitrogen deposition on songnen grassland, china]. | using infrared radiator and applying nitrogen on leymus chinensis community on songnen grassland to simulate global warming and nitrogen deposition, phytolith was extracted from l. chinensis, the morphology and content of phytolith were analyzed. phytolith in l. chinensis were classified into 4 main classes and 12 subclasses, as well as some small phytolith fragments. of all the phytolith types, the hat-shaped take as much as 70%. the hat-shaped with spire and hat-shaped with flat peak may have ... | 2010 | 21090283 |
| [hyperspectral remote sensing monitoring of grassland degradation]. | the distributing of china's grassland is abroad and the status of grassland degradation is in serious condition. so achieving real-time and exactly grassland ecological monitoring is significant for the carbon cycle, as well as for climate and on regional economies. with the field measured spectra data as data source, hyperspectral remote sensing monitoring of grassland degradation was researched in the present article. the warm meadow grassland in hulunbeier was chosen as a study object. reflec ... | 2010 | 21137410 |
| [analysis of difference between ecosystem respirations of leymus chinensis steppe and stipa baicalensis steppe]. | static opaque chamber-chromatographic technique was applied to measure the ecosystem respirations of leymus chinensis steppe and stipa baicalensis steppe. the affecting factors of ecosystem respiration were analyzed. the difference between ecosystem respirations of the two grasslands was compared and the reasons resulting in the difference were analyzed. ecosystem respiration of leymus chinensis steppe [averaged (12.03 +/- 2.10) mg x (m2 x min)(-1)] was significantly smaller than that of stipa b ... | 2010 | 21250459 |
| responses of photosynthetic capacity to soil moisture gradient in perennial rhizome grass and perennial bunchgrass. | changing water condition represents a dramatic impact on global terrestrial ecosystem productivity, mainly by limiting plant functions, including growth and photosynthesis, particularly in arid and semiarid areas. however, responses of the potential photosynthetic capacity to soil water status in a wide range of soil moisture levels, and determination of their thresholds are poorly understood. this study examined the response patterns of plant photosynthetic capacity and their thresholds to a so ... | 2011 | 21266062 |
| absorption and translocation of nitrogen in rhizomes of leymus chinensis. | leymus chinensis is a dominant species in the inner mongolia steppe, northern china. plant growth in northern china grassland is often limited by low soil nitrogen availability. the objective of this study is to investigate whether rhizomes of leymus chinensis are involved in the contribution of n uptake. the n concentration, (15)n concentration and (15)n proportion in roots, rhizomes and shoots after 48 h exposure of roots (l(root)) and rhizomes (l(rhizo)) separately and roots and rhizomes toge ... | 2011 | 21290454 |
| improved drought and salt tolerance of arabidopsis thaliana by transgenic expression of a novel dreb gene from leymus chinensis. | dehydration-responsive element-binding (dreb) proteins are important transcription factors in plant stress responses and signal transduction. based on high-throughput sequencing results, a new cdna sequence encoding an lcdreb3a transcription factor from the drought-resistant forage grass, leymus chinensis, was isolated by race pcr. sequence similarity analysis indicates that the gene product is active in the aba-responsive pathway, and real-time pcr-based expression analysis shows the transcript ... | 2011 | 21509473 |
| assessment of effects of the rising atmospheric nitrogen deposition on nitrogen uptake and long-term water-use efficiency of plants using nitrogen and carbon stable isotopes. | this study assesses the effects of the atmospheric nitrogen (n) deposition on the n uptake and the long-term water-use efficiency of two c(3) plants (agropyron cristatum and leymus chinensis) and two c(4) plants (amaranthus retroflexus and setaria viridis) using n and c stable isotopes. in addition, this study explores the potential correlation between leaf n isotope (δ(15) n) values and leaf c isotope (δ(13) c) values. this experiment shows that the atmospheric n deposition has significant effe ... | 2011 | 21638358 |
| [diversity and community structure of soil ammonia-oxidizing bacteria in hulunbeier grassland, inner mongolia]. | by the methods of polymerase chain reaction-denaturing gradient gel electrophoresis and sequence analysis, a comparative study was conducted on the diversity and community structure of soil ammonia-oxidizing bacteria in the filifolium sibiricum steppe, stipa baicalensis steppe, leymus chinensis steppe, stipa grandis steppe, and stipa kryrowi steppe in hulunbeier grassland, inner mongolia. a significant difference was observed in the community structure of soil ammonia-oxidizing bacteria among th ... | 2011 | 21774314 |
| short communication: effects of replacing part of corn silage and alfalfa hay with leymus chinensis hay on milk production and composition. | the objective of this research was to investigate the effects of replacing part of corn silage (cs) and alfalfa hay (ah) with leymus chinensis hay on milk production and composition. twenty multiparous holstein dairy cows were used in a randomized block design for a 14-week period and 2 treatments. treatments were (dry matter basis): (1) non-leymus chinensis hay diet (nlc; 35% cs, 15% ah) and (2) added leymus chinensis hay diet (alc; 30% cs, 10% ah, 10% leymus chinensis hay). adding leymus chine ... | 2011 | 21700048 |
| Anatomical and physiological plasticity in Leymus chinensis (Poaceae) along large-scale longitudinal gradient in northeast China. | Although it has been widely accepted that global changes will pose the most important constrains to plant survival and distribution, our knowledge of the adaptive mechanism for plant with large-scale environmental changes (e.g. drought and high temperature) remains limited. | 2011 | 22087223 |
| Divergent changes in plant community composition under 3-decade grazing exclusion in continental steppe. | An understanding of the factors controlling plant community composition will allow improved prediction of the responses of plant communities to natural and anthropogenic environmental change. Using monitoring data from 1980 to 2009, we quantified the changes in community composition in Leymus chinensis and Stipa grandis dominated grasslands in Inner Mongolia under long-term grazing-exclusion and free-grazing conditions, respectively. We demonstrated that the practice of long-term grazing exclusi ... | 2011 | 22073169 |
| [salinization-alkalization of leymus chinensis grassland in songnen plain of northeast china]. | field survey and site study were conducted to approach the process and causes of salinization-alkalization of leymus chinensis grassland in songnen plain, and to examine the hypothesis of soil disturbance-bareness. in the grassland, surface soil (0-30 cm) had a lower salt content, while deeper soil (> 30 cm) was in adverse. thereby, the grassland was defined as soil-salted grassland. there was an increasing salt content in surface soil. this process was called as soil salinization-alkalization, ... | 2011 | 21941740 |
| the fluxes of co2 from grazed and fenced temperate steppe during two drought years on the inner mongolia plateau, china. | the co(2) flux was measured by the eddy covariance method on a temperate leymus chinensis steppe over a period of 17 months spanning two consecutive growing seasons. the amount of precipitation was nearly normal, but it was low in the early and high in the late growing period in 2006. in the 2007 growing season, the amount of precipitation was about 45% less than the multi-year average and more evenly distributed. comparisons were made between a moderately grazed site and a 28-year-old fenced si ... | 2011 | 22024234 |
| responses of a dominant temperate grassland plant (leymus chinensis) to elevated carbon dioxide and nitrogen addition in china. | the impact of elevated atmospheric co(2) concentration on plant communities is varied and strongly dependent on the dominant species response, as well as nutrient conditions. responses of a dominant species (leymus chinensis) to elevated co(2) and n application were examined with open-top chambers in a typical temperate grassland in northern china for 3 yr. the significant effect of elevated co(2) on l. chinensis growth was mainly reflected in the higher photosynthetic rates, increased leaf numb ... | 2010 | 20048313 |
| [allelopathic effects of artemisia frigida on three poaceae plants seed germination and seedling growth]. | aqueous extracts of artemisia frigida leaf and stem and soils beneath a. frigida were used to test their allelopathic effects on the seed germination and seedling growth of three poaceae plants (leymus chinensis, stipa krylovii, and cleistogenes squarrosa) on leymus chinensis grassland. the aqueous extracts of a. frigida leaf and stem decreased the seed germination index of test plants and prolonged their seed germination time, and inhibited the shoot growth of the three plants and the root grow ... | 2010 | 20879526 |
| [determination of leymus chinensis quality by near infrared reflectance spectroscopy]. | one hundred fifty leymus chinensis samples with different growth stage, areas, and preparing method (oven-drying and shading natural dry), were selected to study the potential of determination of crude protein (cp), neutral detergent fiber (ndf) and acid detergent fiber (adf) in the present research. the quality parameters of leymus chinensis were firstly predicted using the near infrared reflectance spectroscopy in china. the three models were validated by cross-validation and external-validati ... | 2011 | 22250545 |
| rhizome severing increases root lifespan of leymus chinensis in a typical steppe of inner mongolia. | root lifespan is an important trait that determines plants' ability to acquire and conserve soil resources. there have been several studies investigating characteristics of root lifespan of both woody and herbaceous species. however, most of the studies have focused on non-clonal plants, and there have been little data on root lifespan for clonal plants that occur widely in temperate grasslands. | 2010 | 20711343 |
| isolation and characterization of a novel plasma membrane intrinsic protein gene, lcpip1, in leymus chinensis that enhances salt stress tolerance in saccharomyces cerevisiae. | a novel plasma membrane intrinsic, lcpip1, was isolated from leymus chinensis using race method. the lcpip1 has 288 amino acids with an estimated molecular mass of 30.6 kda. semi rt-pcr analysis indicated that the expression level of lcpip1 was obviously higher in leaf than root. the lcpip1 was also found to be induced by salt stress. in addition, transformed with the lcpip1, saccharomyces cerevisiae could increase tolerance to salt stress. these results indicate that the lcpip1 gene seems to pl ... | 2011 | 22072142 |
| plants can benefit from herbivory: stimulatory effects of sheep saliva on growth of leymus chinensis. | plants and herbivores can evolve beneficial interactions. growth factors found in animal saliva are probably key factors underlying plant compensatory responses to herbivory. however, there is still a lack of knowledge about how animal saliva interacts with herbivory intensities and how saliva can mobilize photosynthate reserves in damaged plants. | 2012 | 22235277 |
| foliar δ(13)c response patterns along a moisture gradient arising from genetic variation and phenotypic plasticity in grassland species of inner mongolia. | plants depend upon both genetic differences and phenotypic plasticity to cope with environmental variation over different timescales. the spatial variation in foliar δ(13)c levels along a moisture gradient represents an overlay of genetic and plastic responses. we hypothesized that such a spatial variation would be more obvious than the variation arising purely from a plastic response to moisture change. leymus chinensis and stipa spp. were sampled from inner mongolia along a dry-wet transect, a ... | 2012 | 23467429 |