title: Degradation of chlorpyrifos in laboratory soil and its impact on soil microbial functional diversity.
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 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.
authors.affiliation: Department of Plant Protection, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310029, China. agri@zju.edu.cn
authors.forename: Fang
authors.initials: F
authors.lastname: Hua
authors.forename: Yu
authors.initials: Y
authors.lastname: Yunlong
authors.forename: Chu
authors.initials: C
authors.lastname: Xiaoqiang
authors.forename: Wang
authors.initials: W
authors.lastname: Xiuguo
authors.forename: Yang
authors.initials: Y
authors.lastname: Xiaoe
authors.forename: Yu
authors.initials: Y
authors.lastname: Jingquan
mesh_terms: D001673:Biodegradation, Environmental; D004390:Chlorpyrifos / Q000737:chemistry / Q000378:metabolism*; D007306:Insecticides / Q000737:chemistry / Q000378:metabolism*; D025341:Principal Component Analysis; D012987:Soil; D012988:Soil Microbiology
chemical_list: D007306:Insecticides; D012987:Soil; D004390:Chlorpyrifos