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Impact of imazethapyr on the microbial community structure in agricultural soils

文献类型： 外文期刊

作者： Zhang, Changpeng 1 ; Xu, Jun 1 ; Liu, Xingang 1 ; Dong, Fengshou 1 ; Kong, Zhiqiang 1 ; Sheng, Yu 1 ; Zheng, Yongquan 1 ;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Pesticide Chem & Applicat, Minist Agr, Inst Plant Protect, Beijing 100193, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Qual & Stand Agroprod, Hangzhou 310021, Zhejiang, Peoples R China

关键词： microbial community structure;PLFA;herbicide;imazethapyr

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

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收录情况： SCI

摘要： Large amounts of imazethapyr were applied for weed control in cultivation fields in China, but their effects on the soil microbial community remains unclear. In this study, two agricultural soils, a silty loam (HS)and a loamy soil (QL), were spiked with imazethapyr (CK, 0.1,1 and 10 mg kg~(-1)) and incubated for 1, 15, 30, 60, 90 and 120 d. In addition, untreated controls received only water. The soil microbial community structures were characterized by investigating the phospholipid fatty acids (PLFA) and microbial bio-mass C. Soil microbial biomass C and total concentration of PLFA were variable with incubation time, which were also reduced by the addition of imazethapyr. Imazethapyr addition also decreased the ratios of GN/GP and fungi/bacteria. A larger stress level, measured as the ratio of PLFA (cycl7:0 + cycl9:0)/ (16:1ω7c+18:lω7c), was found in the high concentration (1 and 10 mg kg~(-1)) herbicide treatment groups. The effects of imazethapyr at the field application on soil microbial biomass and microbial community were minor. Principal component analysis (PCA) of the PLFA clearly separated the treatments and incubation times. Both soils showed different total PLFA concentrations and ratios of GN/GP and fungi/ bacteria, but similar changes in the PLFA pattern upon soil treatment. The soil microbial community structure was shifted by the addition of imazethapyr, which recovered after 60 d. In addition, the dissipation of imazethapyr was slow in both soils. Our results demonstrated that the addition of imazethapyr shifted the microbial community structure, but that it recovered after a period of incubation.

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