极度潮湿可以比在草原生态系统中的极度干旱更大程度地减少土壤微生物残留碳
Yingchao Yu1,2, Shuang Liu1,3, Junxiao Pan1
1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
Global change biology
|July 12, 2025
概括
极端干旱和潮湿对土壤微生物残留碳 (MRC) 有重大影响. 湿度意外地导致MRC比干旱更大的下降,挑战了以前关于草原碳封存的假设.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- 土壤微生物残留碳 (MRC) 对土壤碳池和封存至关重要.
- 了解MRC对极端降水的反应对于预测草原生态系统变化至关重要.
研究的目的:
- 量化极端干旱和湿度对土壤MRC含量的影响.
- 确定影响草原生态系统中土壤MRC动态的关键驱动因素.
主要方法:
- 在中国的九个高山和温带草原进行了协调的降水变化实验.
- 量化了土壤MRC含量和分析了模拟极端干旱和潮湿条件下的关键驱动因素.
主要成果:
- 极端干旱 (降雨率为-50%) 将MRC降低了8%;极端潮湿 (降雨率为50%) 将MRC降低了24%.
- 干旱影响:植物生物量减少抑制了MRC的形成;微生物N酶活性加速了分解.
- 湿度影响:强化微生物限加速了MRC的分解和利用.
结论:
- 极端潮湿可以导致土壤MRC损失比极端干旱更大,这与预期相反.
- 独特的机制控制了MRC对干旱和湿的反应,突出了气候变化下的草原中复杂的碳动态.
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