JZUS - Journal of Zhejiang University SCIENCE

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

http://doi.org/10.1631/jzus.2005.B0324

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

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Abstract: cadmium (Cd) is ubiquitous in the human environment and has toxic effect on soil microbial biomass or its activity, including microbial biomass carbon (C_mic), dehydrogenase activity (DHA) and basal respiration (BR), etc., C_mic, 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 C_mic, 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 C_mic 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.

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