微生物多样性的丧失增加了甲排放和在米土壤中的释放
Ouyuan Jiang1, Yun Chen2, Chao Li3
1Institute of Carbon Neutrality, Zhejiang University, Hangzhou 310027, China; Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China.
The Science of the total environment
|July 11, 2024
概括
土中的微生物多样性丧失显著增加了甲排放和释放,通过抑制天然甲氧化和促进含矿物质的还原性溶解. 这凸显了生物多样性在调节温室气体排放和污染物流动方面的关键作用.
科学领域:
- 环境微生物学环境微生物学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 微生物在温室气体排放和米土壤中的污染物转化中发挥着至关重要的作用.
- 微生物多样性丧失对无氧甲氧化和浸水土壤中减少的影响尚不清楚.
研究的目的:
- 调查操纵微生物多样性的对甲 (CH4) 排放和 (As) 减少在米土壤的影响.
- 了解在微生物多样性减少的条件下驱动CH4和As循环的机制.
主要方法:
- 微生物悬浮被注射到污染的土中,使用连续稀释方法来创建不同的微生物多样性水平.
- 分析了甲排放,孔水As度和微生物群落组成.
- 评估了铁 (Fe) 和溶解有机碳 (DOC) 与释放之间的关系.
主要成果:
- 微生物多样性的减少 (10^-4和10^-6稀释) 导致与未经处理的土壤相比,CH4排放量显著增加.
- 在微生物多样性较低的土壤中,无氧CH4氧化和CH4依赖的As(V) 减少被抑制.
- 由于Fe矿物质的减少溶解的增强,随着微生物多样性的减少,度显著增加.
结论:
- 微生物多样性对于调节土中的CH4氧化和As减少至关重要.
- 微生物多样性的丧失加剧了CH4排放,并促进了As的释放,在受污染的生态系统中构成环境风险.
- 甲基生物和Fe (III) /As (V) 减少细菌的丰度随着多样性丧失而增加,改变了土壤的生物地质化学过程.
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