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Responses of soil ammonia oxidizers to a short-term severe mercury stress

Journal of Environmental Sciences 2015年第12期27卷 8-13页

作者： Zhi-Feng Zhou Yu-Rong Liu Guo-Xin Sun Yuan-Ming Zheng College of Resources and Environment Southwest University State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

The responses of soil ammonia-oxidizing archaea（AOA） and ammonia-oxidizing bacteria（AOB） to mercury（hg） stress were investigated through a short-term incubation experiment.Treated with four different concentrations of hg（CK,hg25,hg50,and hg100,denoting 0,25,50,and 100 mg hg/kg dry soil,respectively）,samples were harvested after 3,7,and 28 day incubation.Results showed that the soil potential nitrification rate（PNR） was significantly inhibited by hg stress during the incubation.However,lower abundances of AOA（the highest in CK： 9.20 × 10~7 copies/g dry soil; the lowest in hg50： 2.68 × 10~7 copies/g dry soil） and AOB（the highest in CK： 2.68 × 10~7 copies/g dry soil; the lowest in hg50：7.49 × 10~6 copies/g dry soil） were observed only at day 28 of incubation（P 〈 0.05）.Moreover,only the community structure of soil AOB obviously shifted under hg stress as seen through DGGE profiles,which revealed that 2-3 distinct AOB bands emerged in the hg treatments at day 28.In summary,soil PNR might be a very useful parameter to assess acute hg stress on soil ecosystems,and the community structure of soil AOB might be a realistic biological indicator for the assessment of heavy metal stress on soil ecosystems in the future.

关键词： mercury （hg） Potential nitrification rate （PNR） Amonia oxidizers Abundance Community structure

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Effect of dissolved organic matter on adsorption and desorption of mercury by soils

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Journal of Environmental Sciences 2008年第9期20卷 1097-1102页

作者： YANG, Yongkui LIANG, Li WANG, Dingyong College of Resources and Environment Southwest University Chongqing 400716 China Chongqing Key Lab of Agricultural Resources and Environment Chongqing 400716 China

Effects of dissolved organic matter (DOM) on adsorption and desorption of hg were investigated in two kinds of soils, Xanthi-Udic Ferralosols (XUF) and Typic Purpli-Udic Cambosols (TPUC). The DOM was obtained from humus soil (DOMH), rice straw (DOMR), and pig manure (DOMP). The presence of DOM obviously reduced hg maximum adsorption capacity with up to 40% decreases over the control, being an order of DOMH (250.00 mg/kg)< DOMR (303.03 mg/kg) < DOMP (322.58 mg/kg) < CK (control 416.67 mg/kg) for the...

关键词： mercury （hg） dissolved organic matter （DOM） adsorption desorption

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Total mercury Concentration of Guizhou Rice and Human Health Risk Assessment

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Meteorological and Environmental Research 2015年第5期6卷 12-15页

作者： Yang Bing Wang Yajie Dai Jiao Luo Yan He Jinlin Tan Hong Guizhou Academy of Testing and Analysis

The mercury content of cultivated land in Guizhou is higher than other provinces in China. An investigation of the total mercury concentration of rice in Guizhou and human health risk assessment was done for the high level of mercury in agricultural soil of Guizhou. This result can provide a scientific basis for food risk inspection management in Guizhou. The samples were detected from 9 zones in Guizhou, and all the samples were local rice. The mercury concentration in rice was detected by the atomic fluorescence spectrometry according to GB/T 5009.17-2003, and the U.S. EPA＇s health risk assessment model was used in the research. The results indicate that a maximum of 0.024 4 mg/kg in the rice samples can be detected, and the exceeding rate is 4.85%, and no mercury can be found in 22 samples. Personal lifetime risk coefficient of mercury health hazard is 1.97 ×10^-3, which belongs to the first level risk （slight risk）. It poses no risk to the exposure population.

关键词： Guizhou Rice mercury （hg） Enrichment Health risk assessment China

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