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Response of microbial community to a new fungicide fluopyram in the silty-loam agricultural soil

文献类型： 外文期刊

作者： Zhang, Ying 2 ; Xu, Jun 1 ; Dong, Fengshou 1 ; Liu, Xingang 1 ; Wu, Xiaohu 1 ; Zheng, Yongquan 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

2.Guizhou Acad Agr Sci, Inst Plant Protect, Guiyang 55000, Peoples R China

关键词： Fluopyram;Soil microbial activity;Soil microbial community;PLFA;Biolog

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

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收录情况： SCI

摘要： The impacts of fluopyram on a soil microbial community were studied at three application rates: at the recommended field rate (T1, 0.5 mg/kg soil), three-fold recommended field rate (T3, 1.5 mg/kg soil) and ten-fold recommended field rate (T10, 5 mg/kg soil). Soil samples were taken after 7, 15, 30, 45, 60 and 90 days of application to determine the fluopyram residue and microbial properties (i.e., basal respiration, substrate-induced respiration, microbial biomass carbon, microbial community function and structure). The half-lives of the fluopyram at levels of 0.5, 1.5 and 5 mg/kg in soil were calculated to be 64.2, 81.5 and 93.6 days, respectively. The results demonstrated that fluopyram treatment (T1, T3 and T10) decreased microbial biomass C but increased the basal respiration, substrate-induced respiration, and ecophysiological indices (qCO(2)). Average well color development (AWCD) represents the oxidative capacity of soil microorganisms cultivated in the BIOLOG micro-plates and usually indicates the overall microbial metabolic capacity. The BIOLOG results revealed that the AWCD in the soil treated with 1.5 and 5 mg/kg fluopyram (T3 and T10) was significantly lower than that of the control during the incubation period. A similar variation in the diversity indices (Simpson index and McIntosh index) was observed. Phospholipid fatty acid (PLFA) analysis revealed that the addition of fluopyram decreased the total amount of PLFAs, bacterial biomass (both Gram-positive (GP) bacteria and Gram-negative (GN)), fungal biomass, the ratios of the GN/GP and fungi/bacteria at all incubation times. Principal component analyses (PCA) suggested that the addition of fluopyram shifted the soil microbial community structure and function. Hence, fluopyram has a harmful effect on overall soil microbial activity, and changed soil microbial community structure and function. (C) 2014 Published by Elsevier Inc.

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