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Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.5 P.324~330


Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil

Author(s):  LIAO Min, LUO Yun-kuo, ZHAO Xiao-min, Huang Chang-yong

Affiliation(s):  School of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   liaomin@zju.edu.cn

Key Words:  Cadmium, Soil microbial biomass, Basal respiration, Dehydrogenase activity, Ecological dose, Paddy soil

LIAO Min, LUO Yun-kuo, ZHAO Xiao-min, Huang Chang-yong. Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil[J]. Journal of Zhejiang University Science B, 2005, 6(4): 324~330.

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author="LIAO Min, LUO Yun-kuo, ZHAO Xiao-min, Huang Chang-yong",
journal="Journal of Zhejiang University Science B",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil
%A LUO Yun-kuo
%A ZHAO Xiao-min
%A Huang Chang-yong
%J Journal of Zhejiang University SCIENCE B
%V 6
%N 5
%P 324~330
%@ 1673-1581
%D 2005
%I Zhejiang University Press & Springer

T1 - Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil
A1 - LIAO Min
A1 - LUO Yun-kuo
A1 - ZHAO Xiao-min
A1 - Huang Chang-yong
J0 - Journal of Zhejiang University Science B
VL - 6
IS - 5
SP - 324
EP - 330
%@ 1673-1581
Y1 - 2005
PB - Zhejiang University Press & Springer
ER -

cadmium (Cd) is ubiquitous in the human environment and has toxic effect on soil microbial biomass or its activity, including microbial biomass carbon (Cmic), dehydrogenase activity (DHA) and basal respiration (BR), etc., Cmic, DHA, BR were used as bioindicators of the toxic effect of Cd in soil. This study was conducted to determine the effects of Cd on soil microbial biomass and its activity in a paddy soil. The inhibition of microbial biomass and its activity by different Cd concentrations was described by the kinetic model (M1) and the sigmoid dose-response model (M2) in order to calculate three ecological doses of Cd: ED50, ED10 and ED5. Results showed that M2 was better fit than M1 for describing the ecological toxicity dose effect of cadmium on soil microbial biomass and its activity in a paddy soil. M2 for ED values (mg/kg soil) of Cmic, DHA, BR best fitted the measured paddy soil bioindicators. M2 showed that all ED values (mg/kg) increased in turn with increased incubation time. ED50, ED10 and ED5 of Cmic with M2 were increased in turn from 403.2, 141.1, 100.4 to 1000.7, 230.9, 144.8, respectively, after 10 d to 60 d of incubation. ED50, ED10 and ED5 of DHA with M2 increased in turn from 67.6, 6.2, 1.5 to 101.1, 50.9, 41.0, respectively, after 10 d to 60 d of incubation. ED50, ED10 and ED5 of BR with M2 increased in turn from 149.7, 6.5, 1.8 to 156.5, 50.8, 35.5, respectively, after 10 d to 60 d of incubation. So the ecological dose increased in turn with increased incubation time for M2 showed that toxicity of cadmium to soil microbial biomass and its activity was decreased with increased incubation time.

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


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