首页|Impact of lfuxapyroxad on the microbial community structure and functional diversity in the silty-loam soil

Impact of lfuxapyroxad on the microbial community structure and functional diversity in the silty-loam soil

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The aim of this work was to assess the effect of applying three different doses of lfuxapyroxad on microbial activity, com-munity structure and functional diversity as measured by respiration, microbial biomass C, phospholipid fatty acid (PLFA) and community-level physiological proifles (CLPPs). Our results demonstrated that substrate-induced respiration (on day 15) and microbial biomass C (on days 7 and 15) were inhibited by lfuxapyroxad, but stimulation was observed thereafter. In contrast, lfuxapyroxad addition increased the basal respiration and metabolic quotients (qCO2) and respiratory quotients (QR). Analysis of the PLFA proifles revealed that the total and bacterial biomass (both Gram-positive bacteria (GP) and Gram-negative bacteria (GN)) were decreased within the initial 15 days, whereas those as wel as the GN/GP ratio were increased at days 30 and 60. Fluxapyroxad input decreased the fungi biomass but increased the bacteria/fungi ratio at al incubation time. Moreover, high lfuxapyroxad input (75 mg lfuxapyroxad kg–1 soil dry weight) increased the microbial stress level. A principal component analysis (PCA) of the PLFAs revealed that lfuxapyroxad treatment signiifcantly shifted the microbial community structure, but al of the observed effects were transient. Biolog results showed that average wel color development (AWCD) and functional diversity index (H′) were increased only on day 60. In addition, the dissipation of lfuxa-pyroxad was slow in soil, and the degradation half-lives varied from 158 to 385 days depending on the concentration tested.

lfuxapyroxadmicrobial activitycommunity structurefunctional diversity

WU Xiao-hu、XU Jun、LIU Yong-zhuo、DONG Feng-shou、LIU Xin-gang、ZHANG Wen-wen、ZHENG Yong-quan

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State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China

This study was supported by the National Natu-ral Science Foundation of ChinaThis study was supported by the National Natu-ral Science Foundation of ChinaSpecial Fund for Agro-Scientiifc Research in the Public Interest, China

3117187931000863201203098

2015

10.1016/S2095-3119(14)60746-2

农业科学学报(英文)
中国农业科学院农业信息研究所

农业科学学报(英文)

CSTPCDCSCDSCI
影响因子：0.576
ISSN：2095-3119
年,卷(期)：2015.(1)
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