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实验性变暖加快了温带草原生态系统中积极的土壤初始化
Xuanyu Tao1,2, Zhifeng Yang1,2, Jiajie Feng1,2
1Institute for Environmental Genomics, University of Oklahoma, Norman, OK, 73019, USA.
Nature communications
|February 8, 2024
概括
全球变暖加快了土壤原始化,增加了温带草原的碳分解和二氧化碳排放. 这种土壤反机制对于预测气候变化影响至关重要.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 微生物生态学 微生物生态学
背景情况:
- 生物圈反机制对于预测全球变暖影响至关重要.
- 土壤原料,由新鲜碳输入刺激的土壤有机碳 (SOC) 的分解,是一个重要的反机制.
- 气候变暖对土壤原始化的影响仍然不太清楚.
研究的目的:
- 为了研究实验性变暖对温带草原土壤初始化的影响.
- 了解变暖如何影响土壤微生物群落及其与碳分解相关的功能基因.
- 将实验结果整合到生态系统模型中,以减少参数不确定性和模拟未来的碳动态.
主要方法:
- 对温带草原生态系统进行了实验性变暖.
- 在变暖条件下分析了细菌群落及其独特的活性类型.
- 量化了与土壤碳分解相关的功能基因.
- 从实验室获得的数据被纳入了生态系统模型,以模拟碳循环.
主要成果:
- 实验性变暖显著加速了12.7%的土壤原始化.
- 变暖改变了细菌群落,观察到38%的独特活跃类型.
- 在变暖下,刺激了土壤碳分解必需的基因.
- 生态系统模型模拟显示,2010年至2016年,由于变暖,原始化诱导的二氧化碳排放量增加了9.1%.
结论:
- 气候变暖提高了土壤原料,导致土壤有机碳分解和温带草原的二氧化碳释放增加.
- 细菌群落的变化和刺激的功能基因与全球变暖引起的原始化效应有关.
- 土壤原始化代表了对气候变化的潜在显著的积极反,影响了陆地碳循环.
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