中国温带草原的土壤有机碳封存潜力和形成效率
Lu Yang1, Ping Li1, Yuntao Wu1
1State Key Laboratory of Forage Breeding-by-Design and Utilization, Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; China National Botanical Garden, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Science bulletin
|October 28, 2025
概括
草原中含有大量的土壤有机碳 (SOC). 了解与矿物相关的有机碳 (MAOC) 缺口是提高碳封存和恢复退化土地的关键.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 气候变化缓解缓解 气候变化缓解
背景情况:
- 草原储存了大量的陆地碳,主要是作为土壤有机碳 (SOC).
- 有效的草原管理碳捕获取决于了解SOC的稳定成矿物相关有机碳 (MAOC).
- 关于MAOC形成能力的空间分布和驱动因素的知识有限.
研究的目的:
- 在中国温带草原上绘制矿物学碳赤字的空间分布图.
- 确定控制SOC稳定潜力的关键因素.
- 评估土地退化对碳捕获能力的影响.
主要方法:
- 在中国的温带草原上进行了2000公里的实地调查.
- 机器学习 (随机森林) 来映射矿物学碳赤字.
- 一个13C标记的实验室化实验,以确定SOC形成效率驱动因素.
主要成果:
- 矿物学碳赤字主要受到细颗粒含量和年平均温度 (MAT) 的影响.
- 人类干扰通过减少细颗粒间接增加了赤字;通过改变土壤化学和减少植物覆盖,MAT增加了赤字.
- 在退化和干旱地区观察到最大的赤字,这表明大量未开发的碳捕获潜力.
结论:
- 土壤退化通过降低MAOC形成效率,显著限制SOC形成潜力.
- 在退化和干旱的草原中进行有针对性的恢复可以增强碳捕获.
- 这项研究提供了对土壤碳捕获潜力的空间显式评估,以缓解气候变化.
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