可生物降解微塑料对土壤碳循环的影响:从土壤呼吸,酶活性,碳使用效率和微生物社区的洞察力
Dan Song1, Guoqin Jin1, Ziqi Su1
1Research Center for Environmental Ecology and Engineering, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
Environmental research
|December 7, 2024
概括
可生物降解的微塑料通过增加呼吸和微生物活动,显著改变土壤碳循环. 聚酸酸盐 (PHA) 显示对土壤碳过程和微生物群落的影响最大.
科学领域:
- 土壤科学 土壤科学
- 环境科学 环境科学
- 微生物学 微生物学
背景情况:
- 土壤中可生物降解微塑料 (BMP) 的水平上升对生态系统健康构成风险.
- 了解BMP对土壤碳循环的影响对于土壤管理至关重要.
研究的目的:
- 研究不同BMP (PBAT,PHA,PLA) 对土壤呼吸,酶活动和碳利用效率 (CUE) 的影响.
- 确定BMP度如何影响这些土壤过程.
主要方法:
- 在64天内将高地土壤与不同度的PBAT,PHA和PLA化.
- 测量二氧化碳排放,微生物生物质碳 (MBC),CUE和关键土壤酶活动 (BG,CBH,NAG,AP).
- 使用脂脂肪酸 (PLFA) 和统计建模 (PLS-PM) 分析微生物群体结构.
主要成果:
- BMP,特别是高度的PHA和PLA,增加了累积的二氧化碳排放和微生物生物质碳.
- 微生物CUE在PHA_H处理中达到峰值,表明碳利用率提高.
- 酶活性有所不同,BG,NAG和AP的增加,但CBH的减少,表明微生物功能的改变.
- BMPs显著改变了微生物群落结构,在PHA_H下,总PLFA显著增加.
结论:
- BMPs对土壤碳循环有很大影响,影响呼吸,微生物生物质和CUE.
- BMPs改变了土壤酶活动和微生物群落结构,PHA和PLA显示出显著的影响.
- 在BMP修改土壤中,BMP度,DOC和微生物多样性是驱动微生物CUE的关键因素.
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