计算方法和采样深度的重要性,以估计土壤碳库存的变化
Anna M Raffeld1, Mark A Bradford2, Randall D Jackson3
1Environmental Defense Fund, 555 12th Street, Suite 400, Washington, DC, 20004 , USA. araffeld@edf.org.
Carbon balance and management
|January 26, 2024
概括
相当的土壤质量 (ESM) 会计和采样到60厘米是测量土壤有机碳 (SOC) 库存的最佳实践. 这些方法提高了碳市场的准确性,反映了土壤管理对更深层土壤形状的影响.
科学领域:
- 土壤科学 土壤科学
- 农业科学 农业科学
- 环境科学 环境科学
背景情况:
- 对自愿的土壤碳市场日益增长的兴趣需要强大的测量,报告和验证 (MRV) 协议.
- 目前对土壤有机碳 (SOC) 的MRV协议缺乏一致性,特别是在计算方法 (固定深度与相当的土壤质量) 和采样深度方面.
- 现有的协议经常使用固定深度测量和浅取样 (30厘米),可能导致由于土壤散装密度变化而导致错误,并忽略了重要的SOC库存.
研究的目的:
- 用固定深度 (FD) 和等效土壤质量 (ESM) 方法估计的20年 SOC 库存变化的差异量化.
- 为了研究更深的土壤采样 (>30厘米) 对SOC库存变化估计的影响.
- 用ESM与FD方法在各种采样深度下比较使用信贷结果.
主要方法:
- 利用了来自加州大学戴维斯分校的世纪实验和威斯康星大学麦迪逊分校的威斯康星综合作物系统试验 (WICST) 的数据.
- 根据FD和ESM的会计方法,比较SOC库存变化估计.
- 分析了采样深度 (包括>30厘米和60厘米) 对SOC库存变化计算的影响.
- 根据不同的会计和抽样策略评估的信贷结果.
主要成果:
- FD和ESM对SOC库存变化的估计可能会有超过100%的分歧,主要是由于表面土壤的散密度变化.
- 会计方法的差异导致了信贷结果的显著变化,尽管许多处理表明SOC股票下降.
- 采样到60厘米捕捉了散密变化,SOC重新分配,以及总SOC库存的更大比例,尽管在深度变化增加.
结论:
- 建议将等效土壤质量 (ESM) 计量和采样到60厘米 (多次深度增量) 作为量化年度排列作物系统中SOC库存变化的最佳实践.
- 准确的SOC库存估计,反映对更深层土壤的管理影响,对于在土壤碳市场中公平的碳信用定价至关重要.
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