贵州省土地利用变化对生态系统碳储量的影响

Impact of land use change on ecosystem carbon stocks in Guizhou

基于贵州省2010—2020年的土地利用数据,结合修正后的碳密度,运用生态系统服务和权衡的综合评估模型对贵州省三期的土地利用碳储量进行测算;分析土地利用变化对陆地生态系统碳储量的影响。研究结果表明:(1)2010—2015年,贵州省耕地减少最明显,林地、草地次之,水域和未利用地变化不大,减少部分主要转为建设用地,贵州省碳储量由32.92×10^(8)t减少到32.79×10^(8)t,减少0.41%。(2)2015—2020年,贵州省林地、耕地减少,除未利用地变化不大外,其他地类面积均有上升,主要特征为耕、林、草三种地类间的相互转化,建设用地也承接了部分转移,贵州省碳储量减少到32.40×10^(8)t,减少1.19%。(3)2010—2020年,贵州省林地、耕地面积减少,草地、建设用地和水域面积增加,未利用地变化不大,贵州省碳储量减少了5255.19×10^(4)t,减少1.6%。

Based on the land use data of Guizhou in 2010,2015 and 2020,combined with the revised carbon density,this paper uses InVEST model to measure the land use carbon stocks in Guizhou Province in three phases and analyzes the impact of land use change on the carbon stocks of terrestrial ecosystems.The results show that:(1)From 2010 to 2015,the reduction of arable land in Guizhou was the most obvious,followed by forest land and grassland,with little change in watershed and unused land,and the reduction was mainly shifted to construction land,and the carbon stock in Guizhou Province was reduced from 3.29 Gt to 3.28 Gt,a decrease of 0.41%.(2)From 2015 to 2020,the area of forest land and arable land in Guizhou decreased,except for unused land,which did not change much,the area of all other land types increased,mainly characterized by the mutual transformation of arable,forest and grass land types,and construction land also took up part of the transfer,the carbon stock in Guizhou decreased to 3.24 Gt,a decrease of 1.19%.(3)From 2010 to 2020,the area of forest land and arable land in Guizhou decreased,the area of grassland,construction land and water area increased,and the unused land changed little,and the carbon stock in Guizhou decreased by 52.55 Mt,or 1.6%.