基于GEE的曲靖市喀斯特石漠化时空演变过程  

Spatio-temporal Evolution of Karst Rocky Desertification in Qujing City Based on Google Earth Engine

作　　者：高伟杰 周斯怡 赵彩云 王妍 殷晓洁 GAO Wei-jie;ZHOU Si-yi;ZHAO Cai-yun;WANG Yan;YIN Xiao-jie(College of Forestry,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学林学院,昆明650224

出　　处：《长江科学院院报》2024年第11期75-81,87,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(31700467);西南林业大学博士科研启动基金项目(112003)。

摘　　要：曲靖市位于长江上游和珠江源头,具有重要的生态区位,探究该地区长时间序列的石漠化变化动态与演变过程具有重要意义。基于Landsat5、Landsat8、DEM等数据,通过GEE云平台和决策树分类法获得1990-2020年的曲靖市石漠化分布,分析其石漠化时空变化特征和演变过程。结果表明:①曲靖市整体石漠化以潜在石漠化、无石漠化为主;31 a间曲靖市已石漠化面积减少1728.38 km^(2),无石漠化面积增加1936.61 km^(2),石漠化整体得到明显改善。②1990-2020年,曲靖市石漠化的总体变化速率是-57.61 km^(2)/a,随石漠化加剧变化速率呈下降趋势;变化频率排序依次为极强度石漠化>强度石漠化>中度石漠化>轻度石漠化>无石漠化>潜在石漠化。③31 a间,曲靖市石漠化演变方向以不变型居多,面积达7967.67 km^(2),占比61.39%;反映石漠化程度好转的持续好转型和波动好转型总面积达3197.03 km^(2),占比24.63%;而表示石漠化程度加剧的恶化型面积最少,为558.52 km^(2),占比4.3%,表明研究区石漠化状况总体呈现好转趋势。Qujing City is located in the upper reaches of the Yangtze River and the source of the Pearl River holding an important ecological position.Exploring the dynamics and evolutionary process of rocky desertification over a long time series in this area is of great significance.In this study,using Landsat5,Landsat8,DEM,etc.,we obtained the rocky desertification distribution from 1990 to 2020 through the Google Earth Engine(GEE)cloud platform and decision tree classification,and analyzed the spatial and temporal change characteristics and evolution process of the rocky desertification.The results show that:1)the overall rocky desertification in Qujing City was primarily characterized potentially rocky and no rocky desertification;in 31 years,the rocky desertification area in Qujing City decreased by 1728.38 km^(2),while the no rocky desertification area increased by 1936.61 km^(2),and the overall rocky desertification was significantly improved.(2)From 1990 to 2020,the overall change rate of rocky desertification in Qujing City was-57.61 km^(2)/a,and the change rate decreasd as the intensity of rocky desertification aggravated:extreme intensity>intensity>moderate>mild>no>potential desertification.(3)Over 31 years,the pattern of rocky desertification evolution in Qujing City remained mostly unchanged,covering an area of 7967.67 km^(2),accounting for 61.39%.Continuous and fluctuating transformations,reflecting improvements in rocky desertification,covered an area of 3197.03 km^(2),or 24.63%.The area of deterioration was 558.52 km^(2),accounting for 4.3%.The results indicate a general improvement in rocky desertification in the study area.

关 键 词：岩溶石漠化 GEE 演变轨迹 曲靖市 

分 类 号：P931.5[天文地球—自然地理学]