Abstract
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 signifficantly ( P < 0.05) inhibited by chlorpyrifos within the ffirst 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 signifficant 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 signifficantly ( P ≤ 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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