| [environmental cost of rice production in dongting lake area of hunan province]. | to evaluate the environmental cost of rice production is of significance for the sustainable development of agriculture and the set-up of green gdp accounting system. in this paper, the environmental cost of rice production in dongting lake area, one of the main bread baskets in china, was evaluated from the aspects of pesticide pollution, chemical fertilizer pollution, greenhouse gases emission, plastic film persistence, paddyfield gleyization, and polderization. the results showed that in 1999 ... | 2005 | 16471365 |
| [change of farmland soil organic carbon content in typical region in hunan province]. | taking yuanjiang city (112 degrees 16' - 112 degrees 56' e, 28 degrees 42' - 29 degrees 11' n) in hunan province as an example, the changes of soil organic carbon content and its distribution in farmland soils in dongting lake region were investigated, based on the dense sampling in typical plots and the investigation of historical materials. the results showed that soil organic carbon in different land uses and cropping systems, such as rice/rice, rice, paddy-upland rotation, increased stably, ... | 2006 | 16881301 |
| environmental geochemistry study of arsenic in western hunan mining area, p.r. china. | the geochemical characteristics of arsenic in the soil of the western hunan mining area of p.r. china were systematically studied. the results show that the strata of western hunan are rich in arsenic and that western hunan is a geochemically abnormal region for arsenic. the experimental study on speciation in the strata also indicates that the speciation of arsenic in the neoproterozoic-cambrian strata are mainly easily transferred speciation (exchangeable, carbonate-bound, sulfides-bound), whi ... | 2005 | 16027966 |
| inferring population history from fine-scale spatial genetic analysis in oryza rufipogon (poaceae). | determining the genetic structure of an in situ conserved population can provide insight into the dynamics of population genetic processes associated with successful plant conservation. we used 21 microsatellite loci to analyse the genetic relationships among individuals (n = 813) collected from a small oryza rufipogon population conserved since 1993 in hunan province of china. the analysis revealed four distinct genetic subpopulations (f(st) = 0.145) without geographic isolation. one subpopulat ... | 2006 | 16629809 |
| [effects of long-term applying sulfur- and chloride-containing chemical fertilizers on weed growth in paddy field]. | an investigation was made at a double-rice paddy field in the qiyang red soil field experimental station, hunan province, china to study the species and biomass of weeds growing in rice (oryza sativa l.) growth season after 34-year application of sulfur (so4(2-)) and chloride (cl(-))-containing chemical fertilizers under the same application rates of nitrogen (n), phosphorus (p), and potassium (k). long-term application of cl(-)-containing chemical fertilizer resulted in the greatest species num ... | 2011 | 21774323 |
| mitigating heavy metal accumulation into rice (oryza sativa l.) using biochar amendment--a field experiment in hunan, china. | a field experiment was conducted to investigate the effect of bean stalk (bbc) and rice straw (rbc) biochars on the bioavailability of metal(loid)s in soil and their accumulation into rice plants. phytoavailability of cd was most dramatically influenced by biochars addition. both biochars significantly decreased cd concentrations in iron plaque (35-81 %), roots (30-75 %), shoots (43-79 %) and rice grain (26-71 %). following biochars addition, zinc concentrations in roots and shoots decreased by ... | 2015 | 25794575 |
| effects of winter covering crop residue incorporation on ch₄ and n₂o emission from double-cropped paddy fields in southern china. | residue management in cropping systems is useful to improve soil quality. however, the studies on the effects of residue management on methane (ch4) and nitrous oxide (n2o) emission from paddy field in southern china are few. therefore, the emissions of ch4 and n2o were investigated in double cropping rice (oryza sativa l.) systems with different winter covering crops using the static chamber-gas chromatography technique to assess the effects of different covering crops on the emissions of green ... | 2015 | 25913315 |
| [officials, gentry, and commoners in the changsha rice riots]. | | 2002 | 20373555 |
| occurrence and partitioning of cadmium, arsenic and lead in mine impacted paddy rice: hunan, china. | paddy rice has been likened to nictiana sp in its ability to scavenge cadmium (cd) from soil, whereas arsenic (as) accumulation is commonly an order of magnitude higher than in other cereal crops. in areas such as those found in parts of hunan province in south central china, base-metal mining activities and rice farming coexist. therefore there is a considerable likelihood that lead (pb), in addition to cd and as, will accumulate in rice grown in parts of this region above levels suitable for h ... | 2009 | 19244995 |
| high percentage inorganic arsenic content of mining impacted and nonimpacted chinese rice. | two approaches were undertaken to characterize the arsenic (as) content of chinese rice. first, a national market basket survey (n = 240) was conducted in provincial capitals, sourcing grain from china's premier rice production areas. second, to reflect rural diets, paddy rice (n = 195) directly from farmers fields were collected from three regions in hunan, a key rice producing province located in southern china. two of the sites were within mining and smeltery districts, and the third was devo ... | 2008 | 18678041 |
| [lead uptake by plant in soil-plant system at lead-zinc deposit area of western hunan province]. | contents of lead in several crops as well as its uptake and distribution by paddy in typical lead-zinc deposit area of western hunan province were studied based on field systematic sampling and laboratory analysis. the average concentration of lead in rice, maize and soy bean in the deposit was 2.4, 1.2 and 3.3 times higher than that in control area, respectively, suggesting that crops in the deposit were heavily contaminated by the element. significant difference of the lead concentrations in c ... | 2008 | 18441940 |
| emissions of ch4 and n2o under different tillage systems from double-cropped paddy fields in southern china. | understanding greenhouse gases (ghg) emissions is becoming increasingly important with the climate change. most previous studies have focused on the assessment of soil organic carbon (soc) sequestration potential and ghg emissions from agriculture. however, specific experiments assessing tillage impacts on ghg emission from double-cropped paddy fields in southern china are relatively scarce. therefore, the objective of this study was to assess the effects of tillage systems on methane (ch4) and ... | 2013 | 23750250 |
| effects of winter cover crops straws incorporation on ch4 and n2o emission from double-cropping paddy fields in southern china. | residue management in cropping systems is believed to improve soil quality. however, the effects of residue management on methane (ch4) and nitrous oxide (n2o) emissions from paddy field in southern china have not been well researched. the emissions of ch4 and n2o were investigated in double cropping rice (oryza sativa l.) systems with straw returning of different winter cover crops by using the static chamber-gas chromatography technique. a randomized block experiment with three replications wa ... | 2014 | 25271923 |
| effect of silicon fertilizers on cadmium in rice (oryza sativa) tissue at tillering stage. | silicon has been found to enhance the plants' tolerance to heavy metal stress. in a field study, the effect of different types of si-rich soil amendments (slag, ground slag, and diatomaceous earth) and fertilizers (activated slag, ground activated slag, and commercial si fertilizer) on the distribution of soluble and insoluble forms of cd in the rice plant organs grown on long-term cultivated paddy soil contaminated with cd (central part of hunan province, china) was investigated. the soluble si ... | 2017 | 28283985 |
| the local impact of a coal-fired power plant on inorganic mercury and methyl-mercury distribution in rice (oryza sativa l.). | emission from coal-fired power plants is one of the major anthropogenic sources of mercury (hg) in the environment, because emitted hg can be quickly deposited nearby the source, attention is paid to the effects of coal-burning facilities on levels of toxic methyl-mercury (mehg) in biota near such sources. since rice is an agricultural crop that can bio-accumulate mehg, the potential effects of a large hg-emitting coal-fired power plant in hunan province, china on both inorganic hg (hg(ii)) and ... | 2017 | 28139322 |