Pyraclostrobin repeated treatment altered the degradation behavior in soil and negatively affected soil bacterial communities and functions

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Lingxi Han , Yiran Wang , Yajie Wang , Han Xu , Mingyu Liu , Jiyun Nie , Bin Huang , Qianwen Wang
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Abstract

This study investigated the degradation dynamics of the fungicide pyraclostrobin in three apple orchard soils, along with the responses of soil bacterial community compositions, functions, co-occurrence patterns, and soil nitrogen cycling, under repeated treatment strategies in laboratory conditions. The degradation half-lives of pyraclostrobin varied across the soil types, ranging from 15.7 to 43.4 days, in the following order: Anyang soil > Qingdao soil > Yangling soil. Repeated pyraclostrobin treatment affected degradation behaviors across the different soils. Pyraclostrobin significantly inhibited soil microbial activity and reduced soil bacterial diversity, with more pronounced negative effects observed at high-concentration treatment. Pyraclostrobin clearly changed soil bacterial community structures, significantly enriching potentially degradative bacterial genera such as Methylibium and Nocardioides, which showed increases in the relative abundances of 3.0–181.8 % compared with control. Additionally, pyraclostrobin reduced the complexity of soil bacterial networks and modified the diversity of functional modules. Notably, repeated treatment severely disrupted soil nitrogen cycling, with the absolute abundances of amoA, amoB, nifH, nirK, and nirS in high-concentration treatment decreasing by up to 19.4–91.8 % compared with control. Collectively, pyraclostrobin repeated application altered the degradation behavior, inhibited soil microbial activities, modified soil bacterial community structures and co-occurrence patterns, and seriously disrupted soil nitrogen cycling.

Abstract Image

吡咯菌酯反复处理改变了土壤的降解行为,对土壤细菌群落和功能产生了负面影响
在实验室条件下,研究了杀菌剂吡氯菌酯在3个苹果园土壤中的降解动态,以及重复处理策略对土壤细菌群落组成、功能、共生模式和土壤氮循环的影响。吡唑菌酯在不同土壤类型下的降解半衰期为15.7 ~ 43.4 d,依次为:安阳土壤;青岛土壤;杨凌土壤。吡咯菌酯重复处理对不同土壤的降解行为有影响。Pyraclostrobin显著抑制土壤微生物活性,降低土壤细菌多样性,高浓度处理的负面效应更为明显。Pyraclostrobin明显改变了土壤细菌群落结构,显著富集了潜在降解细菌属,如Methylibium和Nocardioides,其相对丰度比对照增加了3.0% ~ 181.8%。此外,pyraclostrobin降低了土壤细菌网络的复杂性,改变了功能模块的多样性。重复处理严重破坏了土壤氮循环,高浓度处理的amoA、amoB、nifH、nirK和nirS的绝对丰度与对照相比下降幅度高达19.4% ~ 91.8%。综上所述,吡咯菌酯重复施用改变了土壤的降解行为,抑制了土壤微生物活性,改变了土壤细菌群落结构和共生模式,严重破坏了土壤氮循环。在苹果生产中大量且频繁地使用杀菌剂吡虫胺已造成了严重的土壤污染。然而,吡咯菌酯在不同土壤类型中的降解特性及反复施用后的生态效应尚不清楚。研究了吡虫啉在3个苹果园土壤中的降解动态,以及重复处理对土壤细菌群落组成、功能、共生模式和土壤氮循环的响应。研究结果可为吡虫啉在苹果生产中的合理安全应用提供指导,并为吡虫啉长期污染苹果园土壤的土壤生态风险评价和污染控制提供基础数据。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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