Analysis of Effect of Land Use Changes on Carbon Sequestration Services in Coal Mining Areas in Upper Yellow River Basin
Clarifying the land use change characteristics in coal mining areas and their effect on carbon sequestration is an effective means to promote carbon emission reduction and high-quality development in mining areas under the background of the goals of carbon peak and carbon neutral proposed by the Chinese government.This study took 13 large and medium-sized coal mining areas in the upper Yellow River Basin,analyzed their land use changes from 1990 to 2020 based on multi-source data sets,using the InVEST model,land use dynamic degree,transfer matrix,buffer zone and grey correlation degree analyses.The carbon sequestration services in different mining areas and their surrounding areas were evaluated,their correlations with land use changes and the influences of mining activities on carbon sequestration services in buffer zones at different distances from the mining areas were analyzed.The results showed that:(1)The land use changes in the mining areas mainly included the conversions from grassland,unused land,forest and cultivated land to construction lands(urban,rural,industrial and mining lands).The area of construction lands expanded at a rate of 288.8 hm2/a and the areas of grassland,unused land,forest and cultivated land decreased by 156.0,68.1,47.4 and 26.4 hm2 per year,respectively.Furthermore,there were obvious differences in land use change in different mining areas.(2)During 1990-2020,the single land use dynamics of construction land were positive in different periods,while that of grassland and unused land were negative.The comprehensive dynamic degree of all land use type was the highest during 2010-2015,and was relatively small during 2015-2020.It should be noted that the intensity of land use change in open-pit mining areas was much higher than that in well mining areas.(3)The annual carbon sequestration per hectare ranged from 0.7 to 4.1 Mg/hm2 in all mining areas,and showed a change trend of decreasing-increasing-decreasing.Within 50 km away from the mining area,the annual carbon sequestration increased with the increase of distance,but the influence degree decreased gradually.The carbon sequestration per hectare in open-pit mining areas was much lower than that of well mining areas.(4)The land use types with the average correlation degree between them and annual carbon sequestration services during 1990-2020 from high to low were:unused land>cultivated land>grassland>forest land>water body.The results show that the transfer of unused land and cultivated land to construction land during the development of coal mining areas in the upper reaches of the Yellow River Basin was an important reason for the decline in the carbon sequestration service function of the mining ecosystems.In the future studies,more field observation experiments should be carried out to clearly quantify carbon sequestration services of different vegetation types in the coal mining area to further verify the estimation results of carbon sequestration and improve the accuracy of the carbon sequestration research.
upper Yellow River Basincoal mining arealand use changecarbon sequestration servicebuffer zone
NETL
NSTL
万方数据
维普
