The use of high As-bearing coals has caused more than 3,000 cases of arsenosis patients in southwest Guizhou Province, China. The mode of occurrence of arsenic in coal is an important key role in understanding its beh...The use of high As-bearing coals has caused more than 3,000 cases of arsenosis patients in southwest Guizhou Province, China. The mode of occurrence of arsenic in coal is an important key role in understanding its behavior during usage and damage pathway to human health. Coal samples from endemic arsenosis areas were analyzed with INAA, EMPA, SEM-EDX, LTA, XRD, XAFS, and sequential leaching experiment. Arsenic in pyrite is from under the limit of EMPA to 1.75%, and in most cases, the content of arsenic is lower than 0.5%. Besides pyrite and arsenopyrite, SEM-EDX combined with LTA and XRD find that sulfates, clay and phosphates also contain arsenic. XAFS shows that arsenic mainly exists in the form of As^5＋. More than 50% of arsenic stayes in residual solid and combined with organic matrix in two samples, but most arsenic is leached out in other samples. The occurrence of such exceptionally high As contents in coal and the fact that the arsenic is dominantly organically associated are unique observations.展开更多
The effects of acid deposition on pine forest ecosystems in Longli of Guizhou Province, southwestern China are studied using indoor experiments and model simulations. Indoor experiments are designed to explore the alu...The effects of acid deposition on pine forest ecosystems in Longli of Guizhou Province, southwestern China are studied using indoor experiments and model simulations. Indoor experiments are designed to explore the aluminum toxicity on pine seedlings, and the long-term soil acidification model （LTSAM） and a terrestrial biogeochemistry model （CENTURY） are used to simulate the influences of acid deposition on pine forest ecosystems. The indoor experiment results of aluminum toxicishow that aluminum ions in solution limit plant growth and acid deposition enhances this effect by facilitating the release of aluminum ions from the soil. Pine seedling bio- mass and root elongation decrease as the aluminum concentration increases. The results of model simulations show that the soil chemis- try varies significantly with different changes in acid deposition. When the acid deposition increases, the pH value in the soil solution decreases and the soil A13＋ concentration increases. The increased acid deposition also has negative impacts on the forest ecosystem, i.e., decreases plant biomass, net primary productivity （NPP） and net C02 uptake. As a result, the soil organic carbon （SOC） decreases be- cause of the limited supply of decomposition material. Thus acid deposition need be reduced to help protect the forest ecosystems.展开更多
This paper reports an integrated study of in sire U-Pb geochronology and elemental geochemistry of zircons from the Xianglushan iron-polymetallic deposit in western Guizhou Province, Southwest China. Genetic relations...This paper reports an integrated study of in sire U-Pb geochronology and elemental geochemistry of zircons from the Xianglushan iron-polymetallic deposit in western Guizhou Province, Southwest China. Genetic relationship between this new type of deposit and unroofing of the Emeishan large igneous province （ELIP） is focused. Along with the zoning pattern in spatial distribution of diverse weathering-related deposits along the southern and southeastern margins of the ELIP, it is suggested that the genesis of the iron-polymetallic deposit was specialized by factors of coastal paleogeography in hot-humid climate, where iron-enriched laterites formed, and repetitive marine transgression-regression occurred during the Late Permian.展开更多
HEROIC CANAL BUILDER COMMENDEDHuang Dafa,former Secretary of the Communist Party of China(CPC)Committee of Caowangba Village in Zunyi,southwest China’s Guizhou Province,was honored as a"contemporary role model&q...HEROIC CANAL BUILDER COMMENDEDHuang Dafa,former Secretary of the Communist Party of China(CPC)Committee of Caowangba Village in Zunyi,southwest China’s Guizhou Province,was honored as a"contemporary role model"by the Publicity Department of the CPC Central Committee on April 25 for his perseverance in building a 9,400-meter-long water channel through steep mountains to help fellow villagers get out of poverty.展开更多
E-commerce is connecting the traditional tea industry in Guizhou to the Web The first thing Cai Banghong does every morning is to look at the sales figures of various tea brands on his online store,Hmongling Tea Garde...E-commerce is connecting the traditional tea industry in Guizhou to the Web The first thing Cai Banghong does every morning is to look at the sales figures of various tea brands on his online store,Hmongling Tea Garden,before postingpromotional]nformation and collecting cus- tomers＇ feedback to help target his products. Cai spent two decades growing his tea company, from a small backroom operation to a modern enterprise integrating production, processing and sales, in Duyun, southwest China＇s Guizhou Province. As chairman of the Guizhou Du Yun Maojian Tea Co., Cai also assists local farmers by running a cooperative tea plantation of about 16,000 mu （1,067 hectares）. In the process he has also raised the income of 448 farmers.展开更多
文摘The use of high As-bearing coals has caused more than 3,000 cases of arsenosis patients in southwest Guizhou Province, China. The mode of occurrence of arsenic in coal is an important key role in understanding its behavior during usage and damage pathway to human health. Coal samples from endemic arsenosis areas were analyzed with INAA, EMPA, SEM-EDX, LTA, XRD, XAFS, and sequential leaching experiment. Arsenic in pyrite is from under the limit of EMPA to 1.75%, and in most cases, the content of arsenic is lower than 0.5%. Besides pyrite and arsenopyrite, SEM-EDX combined with LTA and XRD find that sulfates, clay and phosphates also contain arsenic. XAFS shows that arsenic mainly exists in the form of As^5＋. More than 50% of arsenic stayes in residual solid and combined with organic matrix in two samples, but most arsenic is leached out in other samples. The occurrence of such exceptionally high As contents in coal and the fact that the arsenic is dominantly organically associated are unique observations.
基金Under the auspices of National Basic Research Program of China(No.2010CB951802,2005CB422207)Knowledge Innovation Program of Chinese Academy of Sciences(No.KZCX2-YW-219)National High Technology Research and Development Program of China(No.2009AA122104)
文摘The effects of acid deposition on pine forest ecosystems in Longli of Guizhou Province, southwestern China are studied using indoor experiments and model simulations. Indoor experiments are designed to explore the aluminum toxicity on pine seedlings, and the long-term soil acidification model （LTSAM） and a terrestrial biogeochemistry model （CENTURY） are used to simulate the influences of acid deposition on pine forest ecosystems. The indoor experiment results of aluminum toxicishow that aluminum ions in solution limit plant growth and acid deposition enhances this effect by facilitating the release of aluminum ions from the soil. Pine seedling bio- mass and root elongation decrease as the aluminum concentration increases. The results of model simulations show that the soil chemis- try varies significantly with different changes in acid deposition. When the acid deposition increases, the pH value in the soil solution decreases and the soil A13＋ concentration increases. The increased acid deposition also has negative impacts on the forest ecosystem, i.e., decreases plant biomass, net primary productivity （NPP） and net C02 uptake. As a result, the soil organic carbon （SOC） decreases be- cause of the limited supply of decomposition material. Thus acid deposition need be reduced to help protect the forest ecosystems.
基金supported by the National Natural Science Foundation of China(Grant Nos.41373037 and 41173048)Integrated Exploration Project of the Weining-Shuicheng Iron-Polymetallic Deposits,Guizhou Province
文摘This paper reports an integrated study of in sire U-Pb geochronology and elemental geochemistry of zircons from the Xianglushan iron-polymetallic deposit in western Guizhou Province, Southwest China. Genetic relationship between this new type of deposit and unroofing of the Emeishan large igneous province （ELIP） is focused. Along with the zoning pattern in spatial distribution of diverse weathering-related deposits along the southern and southeastern margins of the ELIP, it is suggested that the genesis of the iron-polymetallic deposit was specialized by factors of coastal paleogeography in hot-humid climate, where iron-enriched laterites formed, and repetitive marine transgression-regression occurred during the Late Permian.
文摘HEROIC CANAL BUILDER COMMENDEDHuang Dafa,former Secretary of the Communist Party of China(CPC)Committee of Caowangba Village in Zunyi,southwest China’s Guizhou Province,was honored as a"contemporary role model"by the Publicity Department of the CPC Central Committee on April 25 for his perseverance in building a 9,400-meter-long water channel through steep mountains to help fellow villagers get out of poverty.
文摘E-commerce is connecting the traditional tea industry in Guizhou to the Web The first thing Cai Banghong does every morning is to look at the sales figures of various tea brands on his online store,Hmongling Tea Garden,before postingpromotional]nformation and collecting cus- tomers＇ feedback to help target his products. Cai spent two decades growing his tea company, from a small backroom operation to a modern enterprise integrating production, processing and sales, in Duyun, southwest China＇s Guizhou Province. As chairman of the Guizhou Du Yun Maojian Tea Co., Cai also assists local farmers by running a cooperative tea plantation of about 16,000 mu （1,067 hectares）. In the process he has also raised the income of 448 farmers.
