连续的六可可纳应用改变了土壤中的降解行为,并改变了微生物群落和功能概况
Yiran Wang1, Bin Huang2, Yajie Wang1
1College of Horticulture, Qingdao Agricultural University/Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs/National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao)/Qingdao Key Lab of Modern Agriculture Quality and Safety Engineering, Qingdao, 266109, China.
Environmental research
|September 11, 2025
概括
重复应用的真菌杀菌剂赫萨可纳在土壤中主要通过生物降解而降解. 然而,它破坏了土壤微生物群落和循环,随着应用频率的增加而带来生态风险.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 由于频繁,高剂量的应用,六可纳杀菌剂残留物会积聚在农业土壤中.
- 在土壤中重复使用赫萨可纳的降解途径和生态影响尚不清楚.
研究的目的:
- 为了研究在土壤中的六可可纳降解.
- 评估连续施用六可可纳对土壤微生物群落结构和功能的影响.
主要方法:
- 进行了土壤化实验,以监测六可可纳的降解.
- 用高通量测序和功能性基因表达分析分析了土壤微生物社区的结构和功能.
- 在不同的应用频率和度下计算了降解半衰期 (DT50).
主要成果:
- 生物降解是六可可纳在土壤中的主要降解途径,DT50从18.7天到67.3天不等.
- 连续的应用最初增加,然后减少DT50,而更高的度延长了它.
- 赫萨可纳的应用减少了微生物的功能多样性,改变了细菌组成,并促进了特定的降解属 (例如,Methylibium,Variovorax).
- 循环,特别是化和脱基因表达 (AOA-amoA,AOB-amoA,nirK) 被显著抑制.
结论:
- 可纳在土壤中的降解主要是微生物的.
- 连续的应用会因为破坏土壤微生物群落和循环而带来生态风险.
- 已识别的六可可纳降解细菌可以作为监测真菌杀菌剂影响的生物标志物.
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