高潜水位资源型城市水域转化及其碳排放分析

Analysis of Water Body Conversion and Its Carbon Emission in High Groundwater Level Resource-based Cities

从土地利用转型角度研究高潜水位资源型城市的水域转化及其碳排放,为低碳背景下的水资源治理提供科学支持和有效依据。以淮南市为例,通过Google Earth Engine平台调用随机森林和Landsat系列数据,对1987~2019年进行水域时空演变分析,并对2007~2019年进行土地利用分类,构建水域转化矩阵,运用碳排放系数法,估算淮南市和矿区水域与其他地类相互转化产生的碳排放。结果表明,1987~2019年,淮南市和矿区的水域面积总体上呈增长趋势,增量分别为87.98km 2和68.20km 2;在空间上,淮南市水域变化主要分布于矿区;2007~2019年,水域与耕地相互转化最为频繁,主要是耕地转化为水域,该过程主要发生在矿区;淮南市和矿区水域转化产生的碳排放在2007~2013年分别呈碳源和碳汇,2013~2019年均呈碳汇。淮南市和矿区水域转化呈碳源/碳汇主要取决于水域与建设用地相互转化产生的碳排放量。

The water body conversion and carbon emission of the resource-based cities with high groundwater levelswerestudied from the perspective of land use transition,aiming to provide scientific support and effective basis for water resources governance under low carbon background.Taking Huainan City as an example,the spatio-temporal evolution of water area from 1987 to 2019 was analyzed by using random forest and Landsat series data through Google Earth Engine platform,andthe land use classification was carried out from 2007 to 2019,based on whichthe water body conversion matrix was constructed,and the carbon emission coefficient method was used to estimate the carbon emission from the mutual conversion between water body and other land types in Huainan City and mining area.The results showed that the water areas both of Huainan City and its mining area hadan increasing trend in recent 33 years,with the increment of 87.98km 2 and 68.20km 2 respectively.The changes of water area in Huainan City are mainly distributed in the mining area.From 2007 to 2019,the mutual conversion between water body and cultivated land was frequent,mainly fromthe cultivated land to the water body,which occured in mining area.The carbon emissions from the water conversion of Huainan city and the mining area were carbon source and carbon sink respectively from 2007 to 2013,and were carbon sink from 2013 to 2019.The water body conversion of Huainan City andthe mining area is carbon sourceorsink mainly depending on the carbon emissions from the mutual conversion between water body and construction land.