Improvement of ecological geographic regionalization based on remote sensing and canonical correspondence analysis： A case study in China  

作　　者：JIN JiaXin WANG Ying JIANG Hong KONG Yan LU XueHe ZHANG XiuYing JIN JiaXin;WANG Ying;JIANG Hong;KONG Yan;LU XueHe;ZHANG XiuYing(Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China;International Institute for Earth System Science, Nanjing University, Nanjing 210023, China;Information Center of Urban Planning, Wuxi 214072, China)

机构地区：[1]Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China [2]International Institute for Earth System Science, Nanjing University, Nanjing 210023, China [3]Information Center of Urban Planning, Wuxi 214072, China

出　　处：《Science China Earth Sciences》2016年第9期1745-1753,共9页中国科学（地球科学英文版）

基　　金：Financial support for the study was provided by the China Postdoctoral Science Foundation (Grant No. 2015M570431);the Jiangsu Provincial Natural Science Foundation of China (Grant No. BK20150579);the State High Technology Funds of China (Grant No. 2009AA122001)

摘　　要：Ecological geographic regions, also called eco-regions, can be used to divide a remotely sensed image, which is helpful for reducing the complexity of land cover types within eco-regions and for improving the classification accuracy of land cover. In this case study in China, we improved a method of ecological geographic regionalization that is more suitable for remote sensing mapping of regional land cover, and we obtained new eco-regions. The canonical correspondence analysis(CCA) and k-means clustering were adopted in the ecological geographic regionalization using both seasonal remotely-sensed vegetation information and environmental data including climate, elevation and soil features. Our results show that the combination of seasonal vegetation information and the CCA performed well in the selection of the dominant environmental factor of the biogeographic pattern, and it can be used as regionalization indicators of eco-regions. We found that thermal factors are the most important driving forces of the biogeographic pattern in China, which followed by moisture factors. Two global land cover products(MODIS MCD12C1 and Glob Cover) were used to assess our eco-regions. The results show that our eco-regions performed better than that of a previous study regarding the complexity of land cover types, such as in the number of types and the proportional area of the major/secondary type. These results indicate that the method of ecological geographic regionalization, which is based on environmental factors associated with seasonal vegetation features, is effective for reducing the regional complexity of land cover.Ecological geographic regions, also called eco-regions, can be used to divide a remotely sensed image, which is helpful for reducing the complexity of land cover types within eco-regions and for improving the classification accuracy of land cover. In this case study in China, we improved a method of ecological geographic regionalization that is more suitable for remote sensing mapping of regional land cover, and we obtained new eco-regions. The canonical correspondence analysis （CCA） and k-means clustering were adopted in the ecological geographic regionalization using both seasonal remotely-sensed vegetation information and environmental data including climate, elevation and soil features. Our results show that the combination of seasonal vegetation information and the CCA performed well in the selection of the dominant environmental factor of the biogeographic pattern, and it can be used as regionalization indicators of eco-regions. We found that thermal factors are the most important driving forces of the biogeographic pattern in China, which followed by moisture factors. Two global land cover products （MODIS MCD12C1 and GlobCover） were used to assess our eco-regions. The results show that our eco-regions performed better than that of a previous study regarding the complexity of land cover types, such as in the number of types and the proportional area of the major/secondary type. These results indicate that the method of ecological geographic regionalization, which is based on environmental factors associated with seasonal vegetation features, is effective for reducing the regional complexity of land cover.

关 键 词：Ecological geographic regionalization Remote sensing Canonical correspondence analysis k-means clustering Land cover 

分 类 号：P237[天文地球—摄影测量与遥感]