水土保持研究2025，Vol.32Issue(1)：266-274,284,10.DOI:10.13869/j.cnki.rswc.2025.01.030
黄土高原生态系统碳汇时空变化及其影响因素
Evolution of ecosystem carbon sink and its driving factors in the Loess Plateau
摘要
Abstract
[Objective]The aims of this study are to explore the temporal and spatial variation characteristics of ecosystem carbon sink in the Loess Plateau,and to provide a scientific basis for in-depth analysis of scientific assessment of ecosystem carbon sequestration capacity and formulation of strategies to cope with climate change.[Methods]Based on the existing long-term series of remote sensing products,topography and soil properties,linear trend analysis and geodetectors were used to calculate the net ecosystem productivity(NEP)of the Loess Plateau from 2000 to 2022,and to analyze the spatial and temporal changes of NEP and its influencing factors.[Results](1)The average value of NEP in the Loess Plateau from 2000 to 2022 was 33.44 gC/m2.The current level of NEP in the Loess Plateau in 2022 was 39.9 gC/m2,and the total annual carbon sink reached 25.40 Tg C.The interannual variation of NEP showed a significant increase and gradually stabilized.The overall growth rate was 0.70 gC/(m2·a),with an annual increase of 0.45 Tg C,among which Shanxi Province and Shaanxi Province contributed the most.Although the forest vegetation in the Loess Plateau has the highest carbon sink capacity(NEP)and sink enhancement capacity(NEP trend),due to the large area of grassland,the total carbon sink and sink enhancement contribution of grassland are higher than those of forest.Compared with grassland,farmland and bare land,grassland-shrub,farmland-forest-grass,bare land-forest-grass and other ecological restoration projects can increase the carbon sink capacity of original surface coverage by 83.2％,14.0％and 81.1％,and increase the carbon sink capacity by 5.6％,15.8％and 127.7％.Among the single influencing factors,NDVI,as a vegetation biomass index,is the main factor driving the spatial and temporal dynamic changes of NEP in the Loess Plateau ecosystem.However,the interaction between NDVI and rainfall,NDVI and soil bulk density on NEP spatial differentiation and NEP trend changes can not be ignored.[Conclusion]Combined with the comprehensive consideration of climate characteristics and soil conditions,a series of ecological restoration measures such as adjusting land use structure and increasing plant coverage can effectively improve the carbon sink capacity of the Loess Plateau ecosystem.关键词
黄土高原/净生态系统生产力/地理探测器/影响因素/碳汇Key words
Loess Plateau/net ecosystem productivity/geographical detector/influencing factors/carbon sink分类
资源环境引用本文复制引用
张怡,王志慧,卢小平,肖培青,赵广举..黄土高原生态系统碳汇时空变化及其影响因素[J].水土保持研究,2025,32(1):266-274,284,10.基金项目
黄委优秀青年人才科技项目(HQK-202307) （HQK-202307）
国家重点研发计划青年科学家项目(2022YFC3205200) （2022YFC3205200）
