Environmental biology

Degradation of chlorpyrifos in laboratory soil and its impact on soil microbialfunctional diversity

FANG Hua , YU Yunlong , CHU Xiaoqiang , WANG Xiuguo , YANG Xiaoe , YU Jingquan


Received April 19, 2008,Revised June 27, 2008, Accepted , Available online

Volume 21,2009,Pages 380-386

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Degradation of chlorpyrifos at di erent concentrations in soil and its impact on soil microbial functional diversity were investigated under laboratory condition. The degradation half-live of chlorpyrifos at levels of 4, 8, and 12 mg/kg in soil were calculated to be 14.3, 16.7, and 18.0 d, respectively. The Biolog study showed that the average well color development (AWCD) in soils was significantly (P < 0.05) inhibited by chlorpyrifos within the first two weeks and thereafter recovered to a similar level as the control. A similar variation in the diversity indices (Simpson index 1/D and McIntosh index U) was observed, but no significant di erence among the values of the Shannon-Wiener index H0 was found in chlorpyrifos-treated soils. With an increasing chlorpyrifos concentration, the half-life of chlorpyrifos was significantly (P 6 0.05) extended and its inhibitory e ect on soil microorganisms was aggravated. It is concluded that chlorpyrifos residues in soil had a temporary or short-term inhibitory e ect on soil microbial functional diversity.

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