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《Journal of Agro-environmental Science》 2004-04
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Microbial Populations and Bacterial Physiological Groups in Purple Soils Polluted by Mercury

LI Mei1,HOU Yan-lin1,PI Guang-jie2(1.Research Center for Eco-Environmental Science,CAS.Beijing 100085,China ;2.College of Resource &Environmental Science,Southwest Agriculture Universi ty,Chongqing 400716,China)  
Effects of mercury on microbial populations (bacteria, fungi and a ct inomyces) and physiological groups (ammonifiers, nitrifiers, azotobacter and cel lulolytic bacteria) were assayed in purple soils from both laboratory incubation and field. The r results obtained from laboratory incubation showed that mercur y generally inhibited the development of bacteria, actinomyces, and fungi, but t he responses of physiological groups revealed different features to mercury poll ution: ammonifiers were depressed intensively, the survival rate decreased to ab out 10%of the control where the soil was addressed with HgCl2 up to 10 mg·kg-1; nitrifiers also behaved growth inhibition in soils treated with HgCl2 less th an 50 mg·kg-1, but higher dosage of mercury stimulated their upgrowth; opposit ely, azotobacter and cellulolytic bacteria thrived in lower mercury treatments w hile declined in higher ones. In field soil, mercury also showed inhibitory effe cts on the populations of bacteria and actinomyces, whereas fungi exhibited mark ed resistance to mercury. The soil threshold concentrations of mercury estimated by sensitive microbes with over 50%inhibition ranged from 5 to 10 mg·kg-1 in the studied purple soil.
【Fund】: 国家自然科学基金(40071053)
【CateGory Index】: X172
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