基于GEE平台1995—2022年云南省LULC变化及驱动因素分析  

Analysis of LULC Changes and Driving Factors in Yunnan Province from 1995 to 2022 Based on GEE Platform

作　　者：沈健 岳彩荣 郭喜龙 李馨 张澜钟 徐天蜀 SHEN Jian;YUE Cairong;GUO Xilong;LI Xin;ZHANG Lanzhong;XU Tianshu(College of Forestry,Southwest Forestry University,Kunming 650224,China;Yunnan Provincial University Engineering Center of Forestry 3S Technology,Kunming 650224,China)

机构地区：[1]西南林业大学林学院,昆明650224 [2]云南省高校林业3S技术工程中心,昆明650224

出　　处：《森林工程》2024年第4期58-70,共13页Forest Engineering

基　　金：国家自然科学基金项目(42061072)。

摘　　要：快速准确地获取土地利用信息,可为城市发展和生态环境保护提供参考依据。基于谷歌地球引擎(Google Earth Engine,GEE)平台的多时相Landsat图像密集时间叠加和随机森林算法对云南省的土地利用类型进行分类,分析云南省土地利用和土地覆盖(Land use and Land cover,LULC)时空变化趋势,并使用地理探测器定量评估关键的驱动因素。结果表明,1)LULC分类平均总体精度和Kappa系数分别为88.64%、86.01%,精度较高,满足数据使用要求。2)云南省土地类型以林地、耕地、草地及稀疏灌草混交地为主,占比97.91%~98.38%,土地利用转移以林地和耕地互相转换、草地及稀疏灌草混交地转为耕地为主。3)云南省滇中和滇东部的土地利用强度总体高于其他地区,滇西北和滇西南地区的土地利用强度较低。4)不同驱动因素对LULC影响程度存在显著差异,植被类型、年均气温和土壤类型对LULC变化的影响程度相对较小,高程、坡度、坡向、年均降水、人口密度、GDP和人口城镇化率等对LULC变化的影响程度普遍较高,其中GDP、人口密度和人口城镇化率对LULC变化程度影响较高。研究结果可为云南省后续生态环境保护政策制定和区域可持续发展提供数据基础与支撑。Quickly and accurately obtaining land use information can provide a reference for urban development and ecological environment protection.This study classifies land use types in Yunnan Province based on multi-temporal Landsat image dense time stacking and random forest algorithm on the Google Earth Engine(GEE)platform,analyzes the spatiotemporal change trends of LULC in Yunnan Province,and uses geodetectors to quantitatively evaluate key drivers factor.The results show that,1)the average overall accuracy and Kappa coefficient of LULC classification in this study are 88.64%and 86.01%,respectively,which is highly accurate and meets the data usage requirements.2)The land types in Yunnan Province are mainly forest land,cultivated land,grassland,and sparse shrub grass mixed land,accounting for 97.91%-98.38%.Land use transfer mainly involves the conversion of forest land and cultivated land,and the conversion of grassland and sparse shrub grass mixed land into cultivated land.3)The land use intensity in central and eastern Yunnan in Yunnan Province is generally higher than that in other regions,while the land use intensity in northwest and southwestern Yunnan is lower.4)There are significant differences in the influence of different driving factors on LULC.Vegetation type,average annual temperature and soil type have a relatively small impact on LULC changes.Elevation,slope,aspect,average annual precipitation,population density,GDP and population urbanization rate,etc.,generally have a high impact on LULC changes,Among them,GDP,population density,and population urbanization rate have a higher impact on LULC changes.The research results can provide data basis and support for subsequent ecological and environmental protection policy formulation and regional sustainable development in Yunnan Province.

关 键 词：云南省 土地利用/土地覆盖(LULC) 遥感监测 谷歌地球引擎 地理探测器 驱动分析 

分 类 号：S771.8[农业科学—森林工程]