Mei Liangchi, Xia Xinle, Cao Jian, Zhao Yuzhen, Huang Haiyun, Li Ying, Zhang Zhaoxian
Key Laboratory of Agri-Food Safety of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
Toxics. 2024 Aug 1;12(8):562. doi: 10.3390/toxics12080562.
Pesticide residues in soil, especially multiple herbicide residues, cause a series of adverse effects on soil properties and microorganisms. In this work, the degradation of three herbicides and the effect on bacterial communities under combined pollution was investigated. The experimental results showed that the half-lives of acetochlor and prometryn significantly altered under combined exposure (5.02-11.17 d) as compared with those of individual exposure (4.70-6.87 d) in soil, suggesting that there was an antagonistic effect between the degradation of acetochlor and prometryn in soil. No remarkable variation in the degradation rate of atrazine with half-lives of 6.21-6.85 d was observed in different treatments, indicating that the degradation of atrazine was stable. 16S rRNA high-throughput sequencing results showed that the antagonistic effect of acetochlor and prometryn on the degradation rate under combined pollution was related to variation of the and . Furthermore, the potential metabolic pathways of the three herbicides in soil were proposed and a new metabolite of acetochlor was preliminarily identified. The results of this work provide a guideline for the risk evaluation of combined pollution of the three herbicides with respect to their ecological effects in soil.
土壤中的农药残留，尤其是多种除草剂残留，会对土壤性质和微生物产生一系列不利影响。在本研究中，考察了三种除草剂在复合污染下的降解情况以及对细菌群落的影响。实验结果表明，与土壤中单独暴露（4.70 - 6.87天）相比，乙草胺和扑草净在复合暴露（5.02 - 11.17天）下的半衰期显著改变，这表明乙草胺和扑草净在土壤中的降解存在拮抗作用。在不同处理中，半衰期为6.21 - 6.85天的莠去津降解率未观察到显著变化，表明莠去津的降解较为稳定。16S rRNA高通量测序结果表明，复合污染下乙草胺和扑草净对降解率的拮抗作用与[具体指标1]和[具体指标2]的变化有关。此外，还提出了三种除草剂在土壤中的潜在代谢途径，并初步鉴定出一种乙草胺的新代谢产物。本研究结果为三种除草剂复合污染对土壤生态效应的风险评估提供了指导。
