温和的十年变暖改变了土壤有机碳成分,但没有改变温带和亚热带森林的总储量
Yujing Yang1,2, Hui Wang1,3, Shirong Liu1
1Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Key Laboratory of Forest Ecosystem Conservation and Restoration of National Forestry and Grassland Administration, Beijing, China.
Ecology letters
|February 19, 2026
概括
温和的长期森林变暖 (低于2°C) 稳定了土壤有机碳 (SOC) 储量,但改变了它们的组成. 森林土壤碳组成的生态系统特异性变化可能会影响气候变化下的未来碳持久性.
科学领域:
- 森林生态森林生态学
- 土壤科学 土壤科学
- 气候变化研究研究气候变化研究
背景情况:
- 土壤呼吸随着变暖而增加,但长期的森林土壤有机碳 (SOC) 稳定性和组成变化是不确定的.
- 了解这些变化对于预测森林生态系统对气候变化的反应至关重要.
研究的目的:
- 研究土壤变暖对温带和亚热带森林中SOC库存和组成的长期影响.
- 为了确定森林生态系统中大量SOC损失的变暖值.
主要方法:
- 一个为期12年的土壤变暖实验,在温带和亚热带森林中平均温度上升1.21°C.
- 在土壤层 (0-10厘米和10-20厘米) 中分析SOC含量和成分 (例如,矿物相关C,芳香C/O-基C比,基C).
- 全球元分析以评估不同升温水平下的SOC损失.
主要成果:
- 在12年的变暖实验中,SOC含量在两层土壤 (0-10厘米和10-20厘米) 中保持稳定.
- 森林中大量的SOC损失仅在持续升温超过2°C的情况下观察到.
- 气候变暖引发了明显的组成变化:温带森林显示矿物相关C和芳香C/O-基C比率下降,而亚热带森林显示基C和基C/O-基C比率增加.
结论:
- 温和的长期变暖低于2°C维持了森林SOC总体库存.
- 变暖推动了森林土壤的生态系统特异性组成转变,影响了未来的碳持久性.
- 这些发现凸显了森林土壤碳对气候变化的复杂反应.
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