滇东南地区PM_(2.5)的时空分布与土地利用研究

Study on Spatio-temporal Distribution and Land Use of PM_(2.5) in Southeast Yunnan

选取了2000—2020年滇东南地区21个县(市)的PM_(2.5)浓度数据和土地利用数据,运用时间序列分析法、克里金插值法、土地转移矩阵、桑基图、相关性分析法等,分析了PM_(2.5)时空分布和土地利用变化情况,并对两者进行了相关性分析。结果表明:2000—2020年滇东南地区PM_(2.5)浓度整体呈先增加后减少的趋势,研究区21年间PM_(2.5)浓度变化较大区域呈现集中块状分布,研究区北部的PM_(2.5)浓度明显低于研究区南部的。滇东南地区PM_(2.5)浓度的变化主要受林地变化的影响。

The PM_(2.5)concentration values and land use data of 21 cities and counties in southeast Yunnan from 2000 to 2020 were selected,and the temporal and spatial distribution of PM_(2.5)and land use change and their correlation were analyzed by time series analysis,Kriging interpolation,land transfer matrix,Sankey diagram and correlation analysis.The results showed that from 2000 to 2020,the overall PM_(2.5)concentration in southeast Yunnan showed a trend of first increasing and then decreasing.The area with large changes in PM_(2.5)concentration in the study area in 21 years showed a concentrated and blocky distribution.The PM_(2.5)concentration in the north was significantly lower than that in the southern part of the study area.The change of PM_(2.5)concentration in this area was mainly affected by the change of forest land.