氯嘧磺隆对土壤微生物群落结构的影响

采用磷脂脂肪酸(PLFA)法研究了黑龙江省苇河地区不同氯嘧磺隆施药历史下土壤微生物群落结构的差异, 并测定了土壤中氯嘧磺隆的残留量.结果表明：不同施药历史下氯嘧磺隆在土壤中的残留量均很低；随着施用氯嘧磺隆年限的增加，土壤微生物的PLFA总量减少， 革兰氏阴性菌/革兰氏阳性菌（GN/GP）和真菌/细菌比降低，土壤微生物的压力指数增加.主成分分析表明，氯嘧磺隆显著改变了大豆田土壤微生物群落结构.

Effects of chlorimuron-ethyl on soil microbial community structure in soybean field

By using phospholipid fatty acids (PLFA) method, this paper studied the soil microbial community structure in the soybean fields with different chlorimuron-ethyl application history in Weihe district of Heilongjiang Province. In the meantime, the residual amount of chlorimuron-ethyl in soil was determined. There was a very low residual of chlorimuron-ethyl in soil under the conditions of different chlorimuron-ethyl application history. With the increasing year of chlorimuron-ethyl application, the total concentration of soil microbial PLFA and the ratios of fungi/bacteria and Gram negative/Gram positive bacteria decreased, and the microbial stress level increased. Principal component analysis (PCA) showed that long-term application of chlorimuron-ethyl into soybean field changed the soil microbial community structure significantly.