title: Microbial characteristics of purple paddy soil in response to Pb pollution.
abstract: The study focused on the change of microbial characteristics affected by Plumbum pollution with purple paddy soil in an incubation experiment. The results showed that low concentration of Plumbum had little effect on most of microbial amounts, biological activity and enzymatic activity. However, denitrifying activity was inhibited severely, and inhibition rate was up to 98%. Medium and high concentration of Plumbum significantly reduced the amounts and activity of all microorganisms and enzymatic activity, which increased with incubation time. Negative correlations were found between Plumbum concentrations and microbial amounts, biological activity and enzymatic activities except fungi and actinomyces. Thus they can be used to indicate the Plumbum pollution levels to some extent. LD(50) of denitrifying bacteria (DB) and ED50 of denitrifying activity were 852mg/kg and 33.5mg/kg. Across all test soil microbes, denitrifying bacteria was most sensitive to Plumbum pollution in purple paddy soil. Value of early warning showed that anaerobic cellulose-decomposing bacteria (ACDB) and actinomyces were also sensitive to Plumbum pollution. We concluded that denitrifying activity, actinomyces, ACDB or DB can be chosen as predictor of Plumbum contamination in purple paddy soil.
authors.affiliation: College of Resources and Environment, Southwest University, Chongqing, PR China.
authors.forename: Qiu-Ju
authors.initials: QJ
authors.lastname: Jiang
authors.affiliation: National Monitoring Station of Soil Fertility and Fertilizer Efficiency on Purple Soils, Chongqing, PR China.
authors.forename: Yue-Qiang
authors.initials: YQ
authors.lastname: Zhang
authors.affiliation: College of Resources and Environment, Southwest University, Chongqing, PR China.
authors.forename: La-Mei
authors.initials: LM
authors.lastname: Zhang
authors.affiliation: College of Resources and Environment, Southwest University, Chongqing, PR China.
authors.forename: Xin-Bin
authors.initials: XB
authors.lastname: Zhou
authors.affiliation: College of Resources and Environment, Southwest University, Chongqing, PR China / National Monitoring Station of Soil Fertility and Fertilizer Efficiency on Purple Soils, Chongqing, PR China.
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Shi
mesh_terms: D001419:Bacteria / Q000187:drug effects* / Q000378:metabolism; D058440:Denitrification; D007854:Lead / Q000633:toxicity*; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000633:toxicity*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D007854:Lead