Impact of fomesafen on the soil microbial communities in soybean fields in Northeastern China.
Impact of fomesafen on the soil microbial communities in soybean fields in Northeastern China.
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DOI：
10.1016/j.ecoenv.2017.10.003
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发表时间：
2018-02
影响因子：
6.8
通讯作者：
Xiaohu Wu;Ying Zhang;Pengqiang Du;Jun Xu;F. Dong;Xingang Liu;Yongquan Zheng
中科院分区：
文献类型：
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作者：
Xiaohu Wu;Ying Zhang;Pengqiang Du;Jun Xu;F. Dong;Xingang Liu;Yongquan Zheng
氟磺胺草醚是我国北方大豆产区普遍使用的残留型除草剂。然而，在土壤中使用氟磺胺草醚的生态风险仍然未知。通过室内和田间试验研究氟磺胺草醚对土壤微生物群落结构的影响。在实验室条件下，施用氟磺胺草醚3.75和37.5mg/kg降低了土壤的基础呼吸（RB）和微生物量碳（MBC）。相比之下，375 mg/kg氟磺胺草醚处理导致RB、MBC、革兰氏阳性菌和革兰氏阴性菌丰度以及真菌生物量显著下降。方差分析表明，处理解释了大部分的变异（38.3%）观察到的土壤微生物群落。田间试验结果表明，长期施用氟磺胺草醚对连作大豆土壤细菌群落组成的影响主要表现在：变形杆菌和放线杆菌的相对平均丰度增加，疣状微生物种类的相对平均丰度降低。此外，酸杆菌和绿弯藻种表现出激活-抑制模式。因此，氟磺胺草醚的施用对北方春大豆区土壤细菌群落结构有一定的影响。
Fomesafen, a widely adopted residual herbicide, is used throughout the soybean region of northern China for the spring planting. However, the ecological risks of using fomesafen in soil remain unknown. The aim of this work was to evaluate the impact of fomesafen on the microbial community structure of soil using laboratory and field experiments. Under laboratory conditions, the application of fomesafen at concentrations of 3.75 and 37.5 mg/kg decreased the basal respiration (RB) and microbial biomass carbon (MBC). In contrast, treatment with 375 mg/kg of fomesafen resulted in a significant decrease in the RB, MBC, abundance of both Gram+ and Gram− bacteria, and fungal biomass. Analysis of variance showed that the treatment accounted for most of the variance (38.3%) observed in the soil microbial communities. Furthermore, the field experiment showed that long-term fomesafen application in continuously cropped soybean fields affected the soil bacterial community composition by increasing the relative average abundance ofProteobacteriaandActinobacteriaspecies and decreasing the abundance ofVerrucomicrobiaspecies. In addition,AcidobacteriaandChloroflexispecies showed a pattern of activation-inhibition. Taken together, our results suggest that the application of fomesafen can affect the community structure of soil bacteria in the spring planting soybean region of northern China.