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Journal of Zhejiang University SCIENCE B 2008 Vol.9 No.3 P.250-260


Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time

Author(s):  Jia-li SHENTU, Zhen-li HE, Xiao-e YANG, Ting-qiang LI

Affiliation(s):  MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   zhe@ufl.edu

Key Words:  Cadmium (Cd), Microbial activity, Microbial community, Soil

Jia-li SHENTU, Zhen-li HE, Xiao-e YANG, Ting-qiang LI. Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time[J]. Journal of Zhejiang University Science B, 2008, 9(3): 250-260.

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author="Jia-li SHENTU, Zhen-li HE, Xiao-e YANG, Ting-qiang LI",
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publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time
%A Jia-li SHENTU
%A Zhen-li HE
%A Xiao-e YANG
%A Ting-qiang LI
%J Journal of Zhejiang University SCIENCE B
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%DOI 10.1631/jzus.B0710630

T1 - Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time
A1 - Jia-li SHENTU
A1 - Zhen-li HE
A1 - Xiao-e YANG
A1 - Ting-qiang LI
J0 - Journal of Zhejiang University Science B
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SP - 250
EP - 260
%@ 1673-1581
Y1 - 2008
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.B0710630

Effects of cadmium (Cd) on microbial biomass, activity and community diversity were assessed in a representative variable charge soil (Typic Aquult) using an incubation study. Cadmium was added as Cd(NO3)2 to reach a concentration range of 0~16 mg Cd/kg soil. soil extractable Cd generally increased with Cd loading rate, but decreased with incubation time. soil microbial biomass was enhanced at low Cd levels (0.5~1 mg/kg), but was inhibited consistently with increasing Cd rate. The ratio of microbial biomass C/N varied with Cd treatment levels, decreasing at low Cd rate (<0.7 mg/kg available Cd), but increasing progressively with Cd loading. soil respiration was restrained at low Cd loading (<1 mg/kg), and enhanced at higher Cd levels. soil microbial metabolic quotient (MMQ) was generally greater at high Cd loading (1~16 mg/kg). However, the MMQ is also affected by other factors. Cd contamination reduces species diversity of soil microbial communities and their ability to metabolize different C substrates. soils with higher levels of Cd contamination showed decreases in indicator phospholipids fatty acids (PLFAs) for Gram-negative bacteria and actinomycetes, while the indicator PLFAs for Gram-positive bacteria and fungi increased with increasing levels of Cd contamination.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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