对全球颗粒物和矿物相关有机碳储存的明确,直接和气候介导的环境控制
Paige M Hansen1,2, Rebecca Even1, Alison E King1
1Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado, USA.
Global change biology
|January 26, 2024
概括
有机颗粒碳 (POC) 的储存取决于温度和pH值,而与矿物相关的有机碳 (MAOC) 则取决于植物的生产力和水分. 了解这些单独的控制是土壤碳管理和气候变化缓解的关键.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- 土壤有机碳 (SOC) 对减缓气候变化和粮食安全至关重要.
- 对SOC储存,特别是颗粒物 (POC) 和矿物相关有机碳 (MAOC) 的理解控制是有限的.
- 需要对POC和MAOC进行单独的分析,以了解SOC存储的全球驱动因素.
研究的目的:
- 调查POC和MAOC存储的等级控制.
- 为了将POC和MAOC的驱动程序与散装SOC存储进行比较.
- 确定POC和MAOC的单独建模是否可以提高对SOC存储的理解.
主要方法:
- 路径分析应用于来自72项研究的综合数据和来自国家生态观测站网络的新数据.
- 数据包括SOC分数 (POC,MAOC),气候变量 (MAT,MAP-PET),碳输入 (NPP) 和土壤特性.
- 对POC,MAOC和大量SOC路径分析进行了比较.
主要成果:
- POC储存受到年平均温度 (MAT) 和土壤pH值的负控制.
- 马奥克储存受到净初级产量 (NPP) 和水分 (MAP-PET) 的积极控制,而土壤沙含量受到负面控制.
- 大量SOC的路径分析解释了比POC和MAOC的单独分析更少的变化.
结论:
- 储存POC和MAOC是由不同的环境变量控制的,这表明不同的监管机制.
- POC主要受到SOC损失过程 (温度,pH) 的影响,而MAOC受到C输入和稳定 (核电站,水分,矿物表面) 的驱动.
- 单独量化和建模POC和MAOC对于准确评估和预测SOC存储对全球变化的反应至关重要.
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