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为了更加深刻地理解气候和地形条件对土地覆盖的作用机理,该研究以2001年-2009年逐年的MODIS Land Cover(MCD12Q1)为主要数据源,参考中国土地覆盖分类体系整合国际上通用的5种(IGBP、UMD、LAI-fPAR、NPP和PFT)土地覆盖分类体系,分析年际尺度上中国西北干旱半干旱地区的土地覆盖时空分异及其对气候和地形的响应。研究结果表明:IGBP较其他4种更适合年际尺度上干旱半干旱地区土地覆盖的时空分异研究。2001年-2009年,5种分类体系中农田和草地增加,水体湿地和荒漠减少,聚落保持不变,森林有增有减,并且土地覆盖类型间相互发生转换,其在空间上的转移与干旱半干旱地区的自然条件变化和人类活动相适应。6种土地覆盖类型对自然条件的响应与光、热、水在时空格局上的分配以及人类活动作用的强弱相一致。研究结果可为区域或全球土地利用和土地覆盖研究提供参考。
In order to understand the mechanism of climate and topography on land cover more deeply, this study took MODIS Land Cover (MCD12Q1) year-by-year from 2001 to 2009 as the main data source. According to China’s land cover classification system, five internationally accepted (IGBP, UMD, LAI-fPAR, NPP and PFT) land cover classification system to analyze the spatial and temporal variability of land cover and its response to climate and topography on the interannual scale in arid and semi-arid areas of Northwest China. The results show that: IGBP is more suitable than the other four species on the interannual scale of arid and semi-arid areas of land cover spatial-temporal differences. From 2001 to 2009, the increase of farmland and grassland in five kinds of classification systems, the reduction of water body wetlands and deserts, the constant colonies, the increase and decrease of forests, and the change of land cover types between each other. Their spatial shifts and droughts Changes in natural conditions in semi-arid areas are compatible with human activities. The responses of six land cover types to natural conditions are consistent with the spatial and temporal distribution of light, heat and water as well as the strength of human activities. The results can provide reference for regional or global land use and land cover research.