由于变暖引起的不稳定的微生物群体在代谢上降低了在米土壤中的草碳封存
Jinyuan Zhang1, Zhenhua Yu1, Yi Gao1
1State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China.
Journal of advanced research
|June 30, 2025
概括
气候变暖减少了在田中的土壤有机碳 (SOC),即使有草修正. 变暖减少了微生物多样性,削弱了新陈代谢功能,阻碍了草碳的捕获.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 气候变化研究 气候变化研究
背景情况:
- 气候变暖导致的土壤有机碳 (SOC) 损失是一个重大问题.
- 为了补充SOC,正在探索草修正,但对无氧米土壤的数据有限.
研究的目的:
- 调查气候变暖对大米土壤微生物社区网络的影响.
- 评估与草碳转化和SOC池相关的微生物代谢功能的变化.
主要方法:
- 在不同温度 (25°C,35°C,45°C) 下在土中化13C/15N标记的米.
- 在SOC分数中量化草碳封存.
- 超基因组测序和固态13C NMR分析,以探索生物化学机制.
主要成果:
- 变暖加快了SOC分解,而草修正无法弥补矿物相关C中的碳损失,特别是在45°C时.
- 温度升高显著减少了微生物多样性,并破坏了微生物社区网络的稳定.
- 变暖减少了参与有机碳和矿化中的基因,抑制了草碳和的转化和封存.
结论:
- 变暖对微生物的新陈代谢概况产生负面影响,降低了草修改对SOC稳定性的有效性.
- 气候变暖导致的微生物多样性丧失和外源碳循环的代谢功能减弱必须在田的气候变化缓解战略中考虑.
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