基于InVEST模型的甘肃省碳储量时空变化研究

Study on the Temporal and Spatial Changes of Carbon Reserves in Gansu Province Based on InVEST Model

本文借助ArcGIS软件和InVEST碳储量模块,分析甘肃省2000-2020年土地利用变化对碳储量时空变化的影响,以期为甘肃省增强区域碳汇潜力,促进“双碳”目标的实现提供理论参考。结果表明,(1)从碳储量的时间动态变化上看,甘肃省2000、2005、2010、2015、2020年碳储量分别为3318.19×10^(6)、3325.69×10^(6)、3329.02×10^(6)、3322.44×10^(6)和3322.20×10^(6)t,碳储量呈先增后减趋势,总体增加了4.20×10^(6)t。(2)从碳储量的空间动态变化上看,甘肃省碳储量分布呈东南高,西北低的格局,碳储量较高的地区主要集中甘肃省东南部,以林地为主;碳储量较低的地区主要集中在甘肃省西北部,以未利用地为主。(3)甘肃省土地利用类型的碳储量大小为:草地>林地>耕地>未利用地>建设用地>水域;甘肃省最主要的碳库是林地和草地,甘肃省碳损失的主要原因是耕地面积的减少。

Based on ArcGIS software and InVEST carbon storage module,this paper analyzes the impact of land use change on the temporal and spatial changes of carbon storage in Gansu Province from 2000 to 2020,with a view to providing theoretical reference for Gansu Province to enhance regional carbon sink potential and promote the realization of the“dual carbon”goal.The results show that,(1)from the perspective of time dynamic change of carbon reserves,the carbon reserves of Gansu Province in 2000,2005,2010,2015 and 2020 were 3318.19×10^(6)、3325.69×10^(6)、3329.02×10^(6)、3322.44×10^(6)and 3322.20×10^(6)t.The carbon stock increased first and then decreased,with an overall increase of 4.20×10^(6)t.(2)From the perspective of spatial dynamic change of carbon reserves,the distribution of carbon reserves in Gansu Province is high in the southeast and low in the northwest.The areas with high carbon reserves are mainly concentrated in the southeast of Gansu Province,mainly forest land;areas with low carbon reserves are mainly concentrated in the northwest of Gansu Province,mainly in unused land.(3)The carbon storage of land use types in Gansu Province is as follows:grassland>forest land>cultivated land>unused land>construction land>water area;the main carbon pool in Gansu Province is forest land and grassland,and the main reason for carbon loss in Gansu Province is the reduction of cultivated land area.