Effects of repeated glyphosate applications on soil microbial community composition and the mineralization of glyphosate
Effects of repeated glyphosate applications on soil microbial community composition and the mineralization of glyphosate
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DOI：
10.1002/ps.1831
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发表时间：
2010-01-01
影响因子：
4.1
通讯作者：
Gentry, Terry J.
中科院分区：
文献类型：
--
作者：
Lancaster, Sarah H.;Hollister, Emily B.;Gentry, Terry J.
背景：重复施用草甘膦可能比单次施用草甘膦对土壤微生物群落产生更大的影响。通过室内试验，研究了草甘膦施用1次、2次、3次、4次和5次对土壤微生物群落组成、草甘膦矿化和（14）C残留分布的影响。相对于一次，两次，3或4次应用，均在应用后7天和14天（DAA）。此外，16S rRNA细菌基因的测序表明，革兰氏阴性伯克霍尔德氏菌属的丰度。在施用草甘膦后，当草甘膦施用4或5次时，相对于施用1次、2次或3次后矿化的（14）C量，（14）C矿化的累积百分比降低。掺入（14）C残留到土壤微生物生物量是更大的五草甘膦应用程序比第一次应用程序3和7 DAA.CONCLUSION：这些研究表明，草甘膦的耗散或分布的变化，反复应用草甘膦可能与土壤微生物群落组成的变化。(C)2009年化学工业协会
BACKGROUND: Repeated applications may have a greater impact on the soil microbial community than a single application of glyphosate. Experiments were conducted to study the effect of one, two, three, four or five applications of glyphosate on soil microbial community composition and glyphosate mineralization and distribution of (14)C residues in soil.RESULTS: Fatty acid methyl esters (FAMEs) common to gram-negative bacteria were present in higher concentrations following five applications relative to one, two, three or four applications both 7 and 14 days after application (DAA). Additionally, sequencing of 16S rRNA bacterial genes indicated that the abundance of the gram-negative Burkholderia spp. was increased following the application of glyphosate. The cumulative percentage (14)C mineralized 14 DAA was reduced when glyphosate was applied 4 or 5 times relative to the amount of (14)C mineralized following one, two or three applications. Incorporation of (14)C residues into soil microbial biomass was greater following five glyphosate applications than following the first application 3 and 7 DAA.CONCLUSION: These studies suggest that the changes in the dissipation or distribution of glyphosate following repeated applications of glyphosate may be related to shifts in the soil microbial community composition. (C) 2009 Society of Chemical industry