土壤碳酸盐在大陆范围内主导结合的有机碳储存
Li Tang1,2,3, Wei Zhang1,2, Peilei Hu1,2
1Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China.
Global change biology
|October 30, 2025
概括
结合 (Ca) 的有机碳 (OC-Ca) 是一个稳定的土壤碳池. 由土壤pH值和水分驱动的碳酸盐积累控制了OC-Ca,而不是可交换的Ca,影响了土壤有机碳的动态.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 土壤有机碳 (SOC) 包含具有不同稳定性的多种池.
- 结合 (Ca) 的有机碳 (OC-Ca) 是一个关键的稳定,与矿物相关的SOC池.
- 了解OC-Ca分布和驱动因素对于预测全球变化下的SOC动态至关重要.
研究的目的:
- 评估中国陆地生态系统中的OC-Ca库存.
- 确定大地理尺度上OC-Ca积累的主要驱动因素.
- 评估丰富对OC-Ca稳定性的影响.
主要方法:
- 对OC-Ca. 现场收集和发布的数据的综合.
- 对土壤属性的分析,包括pH值,碳酸盐含量和水分的可用性.
- 在受精和未受精的生态系统中OC-Ca的比较.
主要成果:
- 在SOC总储存量中,OC-Ca约占8%.
- 控制土壤pH的碳酸盐,而不是可交换的Ca,是OC-Ca积累的主要因素.
- 湿度的可用性通过影响土壤pH值和碳酸盐沉而影响OC-Ca分布.
- 丰富诱导的酸化使OC-Ca度降低了11%,其SOC贡献降低了15%.
结论:
- OC-Ca是SOC的重要和稳定的组成部分.
- 碳酸盐的积累,受pH值和水分的影响,是OC-Ca储存的关键.
- 缩对SOC稳定性产生负面影响,因为它减少了OC-Ca.
- 调查结果提供了对OC-Ca应对全球变化的见解,并为SOC管理策略提供了信息.
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