Effects of Cadmium, Lead, and Zinc on Size of Microbial Biomass in Red SoilEnglish Full Text

K. S. KHAN; XIE ZHENGMIAO and HUANG CHANGYONG(College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China))

Abstract: 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 μg g-1; Pb at 100, 200, 300, 450 and 600 μg g-1 and Zn at 50, 100, 150, 200 and 250 μg g-1 soil. In comparison to uncontaminated soil, the microbial biomass carbon and biomass nitrogen decreased sharply in soils contaminated with Cd, Ph 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 Pb, showing their relative toxicity in the order of Cd ＞ Zn ＞ Pb.

Keywords：

cadmium; lead; microbial biomass; red soil; zinc;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Effects of Cadmium, Lead, and Zinc on Size of Microbial Biomass in Red SoilEnglish Full Text

K. S. KHAN; XIE ZHENGMIAO and HUANG CHANGYONG(College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China))

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