十年来的极端干旱减少了阿尔卑斯山地下的碳库存
Ronglei Zhou1,2,3, Jinsong Wang1,2,3, Quancheng Wang1
1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
概括
极端干旱通过破坏土壤-微生物-矿物相互作用,显著耗尽了阿尔卑斯山草原的地下土壤有机碳 (SOC) 库存. 这凸显了为准确预测气候变化而建模地下过程的必要性.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 气候科学 气候科学
背景情况:
- 草原土壤有机碳 (SOC) 库存对于生态系统健康至关重要,但易受气候变化的影响.
- 长期,极端干旱对不同土壤深度的SOC的影响仍然不太清楚.
研究的目的:
- 研究10年干旱梯度对高山草原不同土壤深度 (0-60厘米) 的SOC库存的影响.
- 确定极端干旱如何影响地下碳稳定性以及SOC损失背后的机制.
主要方法:
- 在阿尔卑斯山草原中建立了一个为期10年的降水梯度 (环境,1/2P,1/4P,1/12P) 的实验.
- 在不同的土壤深度 (0-60厘米) 在不同干旱强度下的量化SOC库存.
- 分析了矿物相关有机碳 (MAOC),土壤,微生物生物质和碳使用效率的变化.
主要成果:
- 极端干旱 (1/12 P) 造成了地下 (20-40厘米) 显著的SOC损失,具体层分别下降了27%和37%.
- 轻度至中度干旱在任何深度都没有对SOC产生重大影响.
- 地下碳损失主要归因于与矿物相关的有机碳 (MAOC) 的减少,这与土壤-微生物-矿物相互作用的破坏有关.
结论:
- 长期的极端干旱削弱了地下碳储存和高山草原的稳定性.
- 土壤-微生物-矿物相互作用的破坏是地下SOC损失的基础.
- 地球系统模型需要纳入地下过程,以准确地进行土壤碳气候反预测.
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