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Microencapsulated chlorpyrifos: Degradation in soil and influence on soil microbial community structures

文献类型： 外文期刊

作者： Chen, Liezhong 1 ; Li, Yanli 2 ; Wang, Ting 2 ; Jiang, Yali 2 ; Li, Kai 2 ; Yu, Yunlong 1 ;

作者机构： 1.Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310029, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, State Key Lab Breeding Base Zhejiang Sustainable, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Pesticide;Controlled-release formulation;Non-controlled-release formulation;Side effects;Soil microbiology

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

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收录情况： SCI

摘要： Degradation kinetics of microencapsulated chlorpyrifos (CPF-MC) in soil and its influence on soil microbial community structures were investigated by comparing with emulsifiable concentration of chlorpyrifos (CPF-EC) in laboratory. The residual periods of CPF-MC with fortification levels of 5 and 20 mg/kg reached 120 days in soil, both of the degradation curves did not fit the first-order model, and out-capsule residues of chlorpyrifos in soil were maintained at 1.76 (+/- 0.33) and 5.92 (+/- 1.20) mg/kg in the period between 15 and 60 days, respectively. The degradation kinetics of CPF-EC fit the first-order model, and the residual periods of 5 and 20 mg/kg treatments were 60 days. Bacterial community structures in soil treated with two concentrations of CPF-MC showed similarity to those of the control during the test period, as seen in the band number and relative intensities of the individual band on DGGE gels (p > 0.05). Fungal community structures were slightly affected in the 5 mg/kg treatments and returned to the control levels after 30 days, but initially differed significantly from control in the 20 mg/kg treatments (p < 0.05) and did not recover to control levels until 90 days later. The CPF-EC significantly altered microbial community structures (p < 0.05) and effects did not disappear until 240 days later. The results indicated that the microcapsule technology prolonged the residue periods of chlorpyrifos in soil whereas it decreased its side-effects on soil microbes as compared with the emulsifiable concentration formulation. (C) 2014 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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