区域水土保持碳汇能力评估的指标体系

Index system for evaluating the carbon sink capacity of regional soil and water conservation

科学、系统的水土保持碳汇能力评价指标体系,可为定量分析区域水土保持碳汇能力提供基础数据,对指导水土流失治理措施实施、对我国碳中和目标实现提供水土保持信息支撑具有重大意义。基于水土保持碳汇作用机理、途径与其碳汇物质表现,参考陆地生态系统碳汇核算方法,结合水土流失治理措施及其效益基础数据,提出并采用技术路线“水土保持措施及其效益(碳汇物质基础)→碳汇途径→碳汇实物表现→碳汇量”,分析和厘清水土保持碳汇能力评估指标体系。该指标体系包括水土保持林地、水土保持草地、水土保持基本农田、水土保持工程措施拦水水体、水土保持保土效益等5个一级类11个二级类的水土保持措施与其效益指标,以及对应的碳汇速率、固碳速率、有机质含量等。本研究提出的区域水土保持碳汇能力评估指标是用来监测、估算和统计区域水土流失防治措施与其效益碳汇功能大小的指标,在区域空间尺度上,具有与统计工作可同步实施、获取数据方便等可操作性;在估算参数维度上,具有观测点位及数量与估算结果的空间对应性和准确性,其评估结果可用于区域碳汇能力与其变化趋势分析、生态系统质量与保护成效评价等方面。

[Background]Scientific and systematic evaluation index system of soil and water conservation carbon sink capacity can provide basic data for quantitative analysis of soil and water conservation carbon sink capacity in a region,which is of great significance for guiding the implementation of soil erosion control measures,and providing information of soil and water conservation for the realization of carbon neutralization goals in China.[Methods]Based on the mechanism,pathways and material performances of soil and water conservation carbon sink,referred to the carbon sink evaluation methods of terrestrial ecosystem,and combined with the basic data of soil and water conservation measures and their benefits,the technical route“soil and water conservation measures and their benefits(carbon sink material basis)→carbon sink pathways→material performances of carbon sink→carbon sink quantity”was proposed and adopted to analyze and clarify the evaluation index system of soil and water conservation carbon sink capacity.[Results]The index system includes 5 primary and 11 secondarysoil and water conservation measures and their benefit indexes,as well as the corresponding carbon sink rate and organic matter content,such as soil and water conservation forest land,grassland,basic farmland,water retaining body and their benefits.[Conculsions]The evaluation indexes of regional soil and water conservation carbon sink capacity proposed in this study areused to monitor,estimate and count the carbon sink function size of regional soil and water loss prevention and control measures and their benefits.On the regional spatial scale,they have the operability of synchronous implementation with statistical work and convenient data acquisition.In the dimension of estimation parameters,they have the spatial correspondence and accuracy between the location and number of observation points and the estimation results.The evaluation results can be used for analyzing of regional carbon sink capacity and its change trend,for evaluating of ecosystem quality and protection effectiveness.