基于MODIS影像的中巴经济走廊荒漠化程度时空动态监测研究  

Study on Spatial-temporal Dynamic Monitoring of Degree of Desertification in CPEC based on MODIS Image

作　　者：敏玉芳 张耀南 康建芳 冯克庭 Min Yufang;Zhang Yaonan;Kang Jianfang;Feng Keting(Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Cryosphere Desert Data Center,Lanzhou 730000,China)

机构地区：[1]中国科学院西北生态环境资源研究院,甘肃兰州730030 [2]中国科学院大学,北京100049 [3]国家冰川冻土沙漠科学数据中心,甘肃兰州730030

出　　处：《遥感技术与应用》2021年第4期827-837,共11页Remote Sensing Technology and Application

基　　金：中国科学院信息化专项“寒旱区环境演变研究‘科技领域云’的建设与应用”(XXH13506);国家科技基础条件平台项目“国家特殊环境特殊功能野外观测研究台站共享服务平台”(Y719H71006)资助。

摘　　要：荒漠化是全球最为严重的生态环境问题之一,中巴经济走廊荒漠化问题尤为严重,干旱和大面积的荒漠是其主要的生态环境约束因素。以MODIS数据为基础,提取关键的地表特征参量,定量化研究荒漠化程度与地表特征参量间的关系与规律;构建了基于地表反照率-植被特征空间、决策树的遥感监测模型,并以2015年数据为例,分析了中巴经济走廊荒漠化程度,结果表明:Albedo-MSAVI、Albedo-NDVI和决策树C5.0共3种方法的总体精度分别为88.33%、85.83%和89.2%,Kappa系数分别为0.8363、0.8023和0.8471,分析认为决策树方法最适宜反演中巴经济走廊荒漠化程度。最后基于决策树方法计算了2000~2015年中巴经济走廊荒漠化程度分布数据,分析结果表明在中巴经济走廊极度和重度荒漠化土地占整个区域的50%~60%,中度和轻度荒漠化土地占20%左右,非荒漠化土地和冰雪水体占20%左右。由于2000年左右,巴基斯坦经历了50 a来最严重的旱灾,2000年的重度和极度荒漠化达到总体面积的61.8%,从2005~2015年极度荒漠化土地有所减少,转化为重度荒漠化土地,有部分轻度荒漠化土地转化为非荒漠化土地。总体来说极度荒漠化程度呈下降趋势。Desertification is one of the most serious ecological and environmental problems in the world,especially in the China-Pakistan Economic Corridor(CPEC).Based on MODIS data,this paper extracted key surface feature parameters and quantitatively studies the law and relationship between desertification degree and surface feature parameters.Three remote sensing monitoring models of Albedo-Vegetation feature space and decision tree were constructed,and the desertification degree of CPEC in 2015 was analyzed.The results showed that the overall accuracy of Albedo-MSAVI,Albedo-NDVI and C5.0 methods were 88.33%,85.83%and 89.2%,respectively.According to the analysis,the decision tree method was the most suitable to invert the desertification degree of CPEC.Based on the C5.0,calculated the distribution data of desertification degree from 2000 to 2015,and analyzed the changes in the desertification degree of the CPEC.The results show that the extreme and severe desertification land in the CPEC accounts for 50%to 60%of the entire region.Mild desertification land accounts for about 20%,and non-desertification land and water bodies account for about 20%.Since 1998~2002,Pakistan experienced the worst drought in 50 years,so extreme desertification and severe desertification in 2000 reached the total area 61.8%.From 2005 to 2015,extreme desertification land had decreased,and it had been converted into severe desertification land,and some mild desertification land had been converted into non-desertification land.Overall,extreme desertification had a downward trend.

关 键 词：荒漠化 中巴经济走廊 特征空间 决策树 MODIS 

分 类 号：X171[环境科学与工程—环境科学] TP79[自动化与计算机技术—检测技术与自动化装置]