四年气候变暖减少了沿海湿地的暗碳固定
Bolin Liu1,2, Lin Qi1, Yanling Zheng1,2
1Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
The ISME journal
|July 25, 2024
概括
气候变暖在沿海湿地显著抑制暗碳固定 (DCF),减少碳捕获. 这种微生物过程的下降,由改变的化学自营养素驱动,创造了一个积极的气候反循环.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 气候科学 气候科学
背景情况:
- 黑碳固定 (DCF) 通过chemoautotrophs对于初级生产和全球碳预算至关重要.
- 沿海湿地是重要的生态系统,其中DCF发挥着至关重要的作用.
- 了解DCF对气候变暖的反应对于生态模型和气候预测至关重要.
研究的目的:
- 调查气候变暖对沿海湿地的DCF比率的影响.
- 确定受变暖影响的微生物驱动因素和碳捕集途径.
- 确定DCF对这些生态系统气候变暖的反机制.
主要方法:
- 一个为期四年的实地变暖实验模拟气候变暖 (1.5°C的平均年增长).
- 测量DCF速率和分析化学自营微生物的数量和生物多样性.
- 超基因组学分析,以评估碳固定路径的变化.
主要成果:
- 变暖显著抑制了每年21.6%的DCF率,导致沿海沼泽地区的全球损失估计为0.08-1.5万亿克瓦/年.
- 化学自营微生物群落结构和多样性被确定为DCF变暖率的关键驱动因素.
- 变暖转移了DCF通路,增加了3-基酸/4-基酸循环的相对重要性,同时减少了像Calvin-Benson-Bassham和W-L. Bassham这样的主导通路.
结论:
- 气候变暖通过减少沿海湿地中通过DCF的碳捕获产生了积极的反.
- 微生物反应,包括丰度,生物多样性和代谢途径的变化,调解了变暖对DCF的影响.
- 研究结果强调,在未来的变暖情景下,沿海湿地的碳捕集能力显著下降.
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