土壤N2O和CH4流动中气候驱动的相互作用变化的微生物机制:全球元分析
Awais Shakoor1, Elise Pendall1, Catriona A Macdonald1
1Hawkesbury Institute for the Environment, Western Sydney University, Penrith, New South Wales, 2571, Australia.
Journal of environmental management
|February 15, 2025
概括
全球气温上升增加了土壤的氧化排放和甲吸收. 了解这些温室气体变化对于气候变化减缓战略至关重要.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 气候变化研究 气候变化研究
背景情况:
- 土壤是温室气体 (GHG) 的关键调节者,影响大气度.
- 全球气温上升对土壤的物理和生物过程产生影响,导致温室气体排放.
- 多种气候因素对土壤温室气体流量的相互作用影响仍然不确定.
研究的目的:
- 评估高温 (eT) 与其他全球变化因素对土壤温室气体流量的单独和综合影响.
- 研究ET对不同生态系统的土壤微生物基因和酶活动的影响.
- 为预测未来温室气体排放和制定减缓战略提供见解.
主要方法:
- 全球对1337个来自150个同行评审出版物 (1990-2023) 的对对观察结果进行了元分析.
- 单独和与二氧化碳 (eCO2) 增加,干旱和降水增加 (ePPT) 结合,评估了ET的影响.
- 检查了对土壤N2O和CH4流动,微生物功能基因和草原,耕地和森林中的酶活动的影响.
主要成果:
- 高温 (eT) 显著增加了21%的N2O排放和36%的CH4吸收.
- 它刺激了循环,增加了NO3-, NH4+和amoA-AOB基因的丰度.
- 对N2O排放的ET效应在整个生态系统和组合处理中持续存在,而CH4吸收则有所不同,在草原中被ET+eCO2和ET+ePPT抑制.
结论:
- 高温持续增加土壤N2O排放,这种趋势在全球变化因素的结合下保持.
- 高温对CH4流量的影响变化较大,尤其是在与其他气候驱动因素相互作用时.
- 对微生物机制的进一步研究对于理解和预测全球变化对土壤温室气体流量,特别是CH4的综合影响至关重要.
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