| [ftir spectroscopic studies of the photo-discoloration of chinese fir]. | wood or wood products undergo rapid degradation of surface characteristics and quality indicated by changes in wood color during outdoor exposure owing to a combination of various weathering factors, which may result in significant reduction in utilization values of wood. in the present study, photodegradation of wood surfaces of chinese fir (cunninghamia lanceolata) was carried out by a xenon test chamber which can simulate sunlight irradiation. a fourier transform infrared (ftir) spectroscopy ... | 2009 | 19650469 |
| the regulation of cambial activity in chinese fir (cunninghamia lanceolata) involves extensive transcriptome remodeling. | chinese fir (cunninghamia lanceolata), a commercially important tree for the timber and pulp industry, is widely distributed in southern china and northern vietnam, but its large and complex genome has hindered the development of genomic resources. few efforts have focused on analysis of the modulation of transcriptional networks in vascular cambium during the transition from active growth to dormancy in conifers. here, we used illumina sequencing to analyze the global transcriptome alterations ... | 2013 | 23638988 |
| stand diameter distribution modelling and prediction based on richards function. | the objective of this study was to introduce application of the richards equation on modelling and prediction of stand diameter distribution. the long-term repeated measurement data sets, consisted of 309 diameter frequency distributions from chinese fir (cunninghamia lanceolata) plantations in the southern china, were used. also, 150 stands were used as fitting data, the other 159 stands were used for testing. nonlinear regression method (nrm) or maximum likelihood estimates method (mlem) were ... | 2013 | 23638124 |
| effects of increased nitrogen deposition and rotation length on long-term productivity of cunninghamia lanceolata plantation in southern china. | cunninghamia lanceolata (lamb.) hook. has been widely planted in subtropical china to meet increasing timber demands, leading to short-rotation practices that deplete soil nutrients. however, increased nitrogen (n) deposition offsets soil n depletion. while long-term experimental data investigating the coupled effects related to short rotation practices and increasing n deposition are scarce, applying model simulations may yield insights. in this study, the cenw3.1 model was validated and parame ... | 2013 | 23390533 |
| bicunningines a and b, two new dimeric diterpenes from cunninghamia lanceolata. | two unprecedented dimeric diterpenoids, with a 2,3-dihydrofuran ring fusing an abietane and a 4,5-seco-abietane diterpene, were isolated from cunninghamia lanceolata. their structures were elucidated by spectroscopic measurements, and their absolute configurations were determined by quantum chemical tddft ecd calculations, chemical transformations, and mosher's method. the mosher method carried out with mpa and mtpa esters of the sterically hindered sec-hydroxyl group gave contradictory results, ... | 2012 | 22201421 |
| [effects of uv-b radiation on the decomposition of cunninghamia lanceolata leaf litter]. | a litterbag experiment was conducted to study the decomposition of cunninghamia lanceolata leaf litter under ambient and reduced uv-b radiation (22.1% below ambient). comparing with ambient treatment, the reduced treatment decreased the decomposition rate of c. lanceolata leaf litter by 69.6% (p<0.001), making the relative contents of nitrogen (n), phosphorus (p), and lignin in the litter increased by 150%, 83.3%, and 13.8%, respectively, and the release of potassium (k) and carbon (c) slowed do ... | 2011 | 21774302 |
| [litter fall production and carbon return in cunninghamia lanceolata, schima superba, and their mixed plantations]. | from march 2005 to april 2007, an investigation was made on the litter fall production and carbon return of cunninghamia lanceolata, schima superba, and their mixed plantations in the jian' ou science and education park of soil and water conservation, fujian. in these three plantations, the mean annual litter fall production was from 2470.85 kg x hm(-2) x a(-1) to 4285.99 kg x hm(-2) x a(-1), and dominated by leaf litter, accounting for 68.62%-87.26% of the total production. in c. lanceolata pla ... | 2010 | 21265143 |
| allelochemicals and activities in a replanted chinese fir (cunninghamia lanceolata (lamb.) hook) tree ecosystem. | autotoxicity is a major reason for replant problems in managed tree ecosystems. studies have related phenolics-based allelochemicals to autotoxicity. we selected a 20-year-old replanted chinese fir [cunninghamia lancealata (lamb.) hook] tree ecosystem to isolate, identify, determine the biological activity of, and quantify soil phytotoxins. eight common phenolics (coumarin, vanillin, isovanillin, and p-hydroxybenzoic, vanillic, benzoic, cinnamic, and ferulic acids), friedelin, and a novel cyclic ... | 2008 | 19053367 |
| determination of reactive oxygen species generated in laccase catalyzed oxidation of wood fibers from chinese fir (cunninghamia lanceolata) by electron spin resonance spectrometry. | the aim of the present study was to determine whether the radical reaction intermediates--reactive oxygen species (ros) were formed during the laccase-catalyzed oxidation of wood fibers from chinese fir (cunninghamia lanceolata) and to quantify tentatively its production with electron spin resonance (esr) spectrometry. to investigate the activation pathways triggered by laccase, esr spin-trapping techniques using n-tert-butyl-alpha-phenylnitrone (pbn) as spin trap followed by ethyl acetate extra ... | 2009 | 18650080 |
| [dynamics of biomass- and nutrient accumulation in a chinese-fir plantation]. | based on the over 30 years observation data in huitong national research station of forest ecosystem under chinese academy of sciences and related literatures, this paper analyzed the dynamics of the biomass- and nutrient accumulation and allocation in a chinese-fir (cunninghamia lanceolata) plantation, and the effects of rotation length and harvest intensity on the nutrient input/output. the results showed that stand age was the main factor affecting the biomass- and nutrient accumulation and a ... | 2010 | 20879522 |
| [soil respiration in subtropical forests and model simulation of its relationships with soil temperature and moisture content]. | by using li-6400-09 system, an in situ measurement on the soil respiration, soil temperature, and soil moisture content in three main forest types (evergreen broadleaved forest, cunninghamia lanceolata plantation, and phyllostachys pubescens forest) in subtropical area of china was conducted, with the relationships between soil respiration and soil temperature and moisture content simulated by several models. the c flux of soil respiration in p. pubescens forest, evergreen broadleaved forest, an ... | 2010 | 20879518 |
| [characteristics of soil microbial community structure in cunninghamia lanceolata plantation]. | by using dilution plate, fumigation extraction, and phospholipid fatty acid (plfa) methods, this paper studied the quantities of soil microbial populations and the characteristics of soil microbial community structure in a chinese fir (cunninghamia lanceolata) plantation converted from an evergreen broadleaved forest. the results showed that, during the vegetation change from evergreen broadleaved forest to chinese fir plantation, the microbial biomass carbon and the quantities of culturable bac ... | 2012 | 23189690 |
| de novo characterization of the chinese fir (cunninghamia lanceolata) transcriptome and analysis of candidate genes involved in cellulose and lignin biosynthesis. | chinese fir (cunninghamia lanceolata) is an important timber species that accounts for 20-30% of the total commercial timber production in china. however, the available genomic information of chinese fir is limited, and this severely encumbers functional genomic analysis and molecular breeding in chinese fir. recently, major advances in transcriptome sequencing have provided fast and cost-effective approaches to generate large expression datasets that have proven to be powerful tools to profile ... | 2012 | 23171398 |
| identification and characterization of small non-coding rnas from chinese fir by high throughput sequencing. | small non-coding rnas (srnas) play key roles in plant development, growth and responses to biotic and abiotic stresses. at least four classes of srnas have been well characterized in plants, including repeat-associated sirnas (rasirnas), micrornas (mirnas), trans-acting sirnas (tasirnas) and natural antisense transcript-derived sirnas. chinese fir (cunninghamia lanceolata) is one of the most important coniferous evergreen tree species in china. no srna from chinese fir has been described to date ... | 2012 | 22894611 |
| anti-inflammatory and analgesic activity of total flavone of cunninghamia lanceolata. | the present study was undertaken to investigate the anti-inflammatory and analgesic activity of total flavone of branches and leaves of cunninghamia lanceolata (tfc) to provide a scientific basis for its clinical use and resource development. tfc was evaluated for anti-inflammatory and analgesic activity in mice or rats using chemical and thermal models of nociception, including acetic acid-induced writhing test, hot plate latency test, formalin test and carrageenan induced paw oedema test. resu ... | 2012 | 22832885 |
| identification and analysis of differentially expressed genes in differentiating xylem of chinese fir (cunninghamia lanceolata) by suppression subtractive hybridization. | wood is an important raw material for global industries with rapidly increasing demand. to isolate the genes differentially expressed during xylogenesis of chinese fir (cunninghamia lanceolata (lamb.) hook.), we used a novel system. forward and reverse subtracted cdna libraries were constructed using the suppression subtractive hybridization method; for the forward library we used cdna from the mutant dugansha as the tester and cdna from the wild-type clone jurong 0 as the driver, and for the re ... | 2007 | 18059541 |
| [effects of cunninghamia lanceolata-broadleaved tree species mixed leaf litters on active soil organic matter]. | with incubation test, this paper studied the effects of cunninghamia lanceolata leaf litter and its mixture with the litters of main broadleaved tree species in subtropical china, such as alnus cremastogyne, kalopanax septemlobus and michelia macclurei on active soil organic matter. the results showed that adding leaf litters into soil could significantly increase soil microbial biomass c and n, respiration rate and dissolved organic c, and mixed leaf litters were more effective than c. lanceola ... | 2007 | 17763716 |
| [effects of tree species fine root decomposition on soil active organic carbon]. | with incubation test, this paper studied the effects of fine root decomposition of alnus cremastogyne, cunninghamia lanceolata and michelia macclurei on the content of soil active organic carbon at 9 degrees c , 14 degrees c , 24 degrees c and 28 degrees c. the results showed that the decomposition rate of fine root differed significantly with test tree species, which was decreased in the order of m. macclurei > a. cremastogyne > c. lanceolata. the decomposition rate was increased with increasin ... | 2007 | 17552179 |
| [identification and analysis of differentially expressed genes during wood formation in chinese fir by ssh]. | wood is an important raw material for the global industry with rapidly increasing demand. to isolate the differentially expressed genes in xylogenesis of chinese fir [cunninghamia lanceolata (lamb.) hook], a forward subtractive cdna library was constructed using suppression subtractive hybridization (ssh) method, which was performed using the cdna from the mutant dugansha clone as the tester and the cdna from the normal jurong 0 clone as the driver. six hundred and eighteen clones were obtained. ... | 2007 | 17548313 |
| [effects of replacing natural secondary broad-leaved forest with cunninghamia lanceolata plantation on soil biological activities]. | this paper studied the effects of replacing natural secondary broad-leaved forest with cunninghamia lanceolata plantation in the south, central and upstate areas of subtropical china on the changes of soil chemical and biological properties. the results showed that after replacing with cunninghamia lanceolata plantation, the total organic carbon (toc) content in surface soil decreased by 31.51% - 58.24%, and the contents of soil total n and p, ph value, c/n and c/p also decreased to different de ... | 2005 | 16262050 |
| [dynamics of soil active organic matter in chinese fir plantations]. | soil active organic matter is the main source of soil nutrients, and plays an important role in the formation and stabilization of soil aggregate. chinese fir (cunninghamia lanceolata) is the most important fast-growing timber tree species in southern china, but its continuous plantation has caused soil deterioration. the study on the active fractions of soil organic matter under the first and second generation plantations of chinese fir and the native broad-leaved forest at huitong experimental ... | 2005 | 16252865 |
| [soil quality assessment of forest stand in different plantation esosystems]. | after a clear-cutting of the first generation cunninghamia lanceolata plantation in 1982, three plantation ecosystems, pure michelia macclurei stand (pms), pure chinese-fir stand (pcs) and their mixed stand, were established in spring 1983, and their effects on soil characteristics were evaluated by measuring some soil physical, chemical, microbiological and biochemical parameters. after 20 years' plantation, all test indices showed differences among different forest management models. both pms ... | 2004 | 15825426 |
| genetic diversity and biogeography of cunninghamia konishii (cupressaceae), an island species in taiwan: a comparison with cunninghamia lanceolata, a mainland species in china. | luanta-fir (cunninghamia konishii), an endemic to taiwan, is an outcrossing, long-lived conifer. populations of c. konishii are generally fragmented due to a once high intensity of timber exploitation. c. konishii and cunninghamia lanceolata are two sibling taxa constituting derivative-progenitor species relationship. the amount of genetic variations within and between 11 and 10 populations of c. konishii and c. lanceolata, respectively, were assessed using amplified fragment length polymorphism ... | 2004 | 15522804 |
| [biological characteristics of different forest soils in nanjing-zhenjiang mountan area]. | studies on the biological characteristics, including soil microbe, soil enzyme activity, soil nutritient content, and litter decomposition of different forest soils in nanjing-zhenjiang mountain area showed that the amounts of microbes and the activities of six enzymes in forest soils changed regularly in different forests during different months. the contents of nutritional elements varied regularly with forest growth bio-cycles, and were inerrelated prominently with the amounts of soil microbe ... | 2002 | 12561165 |
| [effects of plant foliar litter diversity on the growth of chinese fir seedling and the absorption of (15nh4)2so4]. | effects of plant foliar litter species composition on the growth of the potted chinese fir seedling and the absorption of (15nh4)2so4 was studied. the result showed that there were significant growth responses to foliar litter treatments. a very noticeable trend was that as the tree species of foliar litter placed on pots increases, the growth of chinese fir seedlings increases steadily. seedling growth in four-species mixed foliar litter were the largest and that in cunninghamia lanceolata + mi ... | 2002 | 12557677 |
| [nutrient retranslocation in fine roots of cunninghamia lanceolata, alnus cremastogyne and kalopanax septemlobum in the mixed plantations--a pilot study]. | comparison of n, p and k concentrations in live and dead fine roots of cunninghamia lanceolata, alnus cremastogyne and kalopanax septemlobum showed that the fine roots of a. cremastogyne had a stronger ability of n retranslocation than k. septemlobum's, but no n translocation occurred in c. lanceolata's. p retranslocation could be found in the fine roots of the all test tree species except c. lanceolata. as for k, it could translocate from fine roots to tree bodies of all these tree species befo ... | 2000 | 11767584 |
| use of the four-and-a-half clearing technique to study gymnosperm embryology: cunninghamia lanceolata. | since its introduction in 1971, the four-and-a-half clearing technique has been widely applied to the study of ovule and female gametophyte development in flowering plants as an alternative to the more arduous paraffin section methods. the technique has undergone several modifications that have broadened its application in studies of angiosperm embryology. to date, however, the technique has not been successfully applied to embryological features of gymnosperms. dark coloration caused by natural ... | 1994 | 7529570 |
| genetic diversity and multilocus associations in cunninghamia lanceolata (lamb.) hook from the people's republic of china. | open-pollinated seeds were assayed for allozyme polymorphisms at 24 loci to assess genetic diversity and multilocous associations in 16 populations of cunninghamia lanceolata (lamb.) hook in the people's republic of china. on average, the percentage of polymorphic loci was 88.0, the number of alleles per locus was 3.0, and the expected heterozygosity was 0.394. the distribution of genetic diversity was not correlated with the geographic and climatic variables of the populations. however, allele ... | 1994 | 24186036 |
| [sequoiaflavone in the leaves of sequoia sempervirens and cunninghamia lanceolata var. konishii and its formation by partial demethylation]. | | 1968 | 5752247 |
| [mixing of cunninghamia lanceolata with michelia macclurei and restoration of self-sustaining mechanism in g. lanceolata plantation]. | the formation of self-sustaining mechanism is one of the major objectives for the sustainable management of plantations. in this study, the incorporation of different proportions of native michelia macclurei into cunninghamia lanceolata plantation was practiced to restore the degraded c. lanceolata plantation, and the comparison of nutrient cycling characteristics and soil nutrient concentrations was made among four types of plantation stand with different mixed rate of native m. macclurei repre ... | 2000 | 11766583 |
| [phenolic acid degradation fungi screened from successive plantation site of chinese fir]. | successive plantation of chinese fir (cunninghamia lanceolata) leads an obvious decline of soil fertility. to solve the urgent problem, five fungal species (f2, f3, f4, f7, f15) which can effectively degrade phenolic acid were screened to degrade the toxic material in successive plantation site and to improve the soil bioactivity. pot experiment showed that all test fungus, except f4, could improve plant growth individually, but not counteract the effect of phenolic acid. inoculating five inocul ... | 2001 | 11758409 |
| [growth analysis on the competition-density effect in cunninghamia lanceolata stands]. | the competition-density (c-d) effect in cunninghamia lanceolata stands was analyzed by using the reciprocal equation 1/omega = a rho + b, where omega and rho represent mean stem volume and density, respectively, the c-d curve given by the reciprocal equation on logarithmic coordinates shifted upward with time. with the increase of physical time t the biological time tau defined as the integral of lambda (t), the growth coefficient in general logistic growth curve, tended to increase to the maxim ... | 2001 | 11757355 |
| a new bislabdane-type diterpenoid from the roots of cunninghamia lanceolata | lanceolatic acid (1), a new bislabdane-type diterpenoid, has been isolated from the roots of cunninghamia lanceolata. its structure was elucidated on the basis of spectroscopic data interpretation and confirmed by single-crystal x-ray diffraction analysis. | 1999 | 10479341 |