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Degradation Of Chlorpyrifos In Laboratory Soil And Its Impact On Soil Microbial Functional Diversity.
Fang Hua, Yu Yun-long, Chu Xiaoqiang, Wang Xiuguo, Yang Xiao-e, Yu Jingquan
Published 2009 · Chemistry, Medicine
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Degradation of chlorpyrifos at different 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 difference among the values of the Shannon-Wiener index H' was found in chlorpyrifos-treated soils. With an increasing chlorpyrifos concentration, the half-life of chlorpyrifos was significantly (P < or = 0.05) extended and its inhibitory effect on soil microorganisms was aggravated. It is concluded that chlorpyrifos residues in soil had a temporary or short-term inhibitory effect on soil microbial functional diversity.
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