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Effects of cadmium, lead, and zinc on size of microbial biomass in red soil

作  者:
K. S. KHAN;XIE ZHENGMIAO;HUANG CHANGYONG
单  位:
College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China);angeaSystems.com
关键词:
cadmium;lead;microbial biomass;red soil;zinc
摘  要:
A laboratory incubation experiment was conducted to study the influence of cadmium (Cd), lead (Pb) and zinc (Zn) on the size of the microbial biomass in red soil. All the three metals were applied, separately, at five different levels that were: Cd at 5, 15, 30, 60 and 100 #mu#g g~(-1) ; Pb at 100, 200, 300, 450 and 600 #mu#g g~(-1) and Zn at 50, 100, 150, 200 and 250 #mu#g g~(-1) soil. In comparison to uncontaminated soil, the microbial biomass carbon and biomass nitrogen decreased sharply in soils contaminated with Cd, Pb and Zn. A more considerable increase in the microbial biomass C: N ratio was observed in the metal contaminated soils than the non-treated control. Among the tested metals, Cd displayed the greatest biocidal effect followed by Zn and Ph, showing their relative toxicity in the order of Cd > Zn > Ph.

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