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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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中国地形起伏度及其与人口分布的相关性
DOI: 10.11821/xb200710007, PP. 1073-1082
Keywords: 地形起伏度,人口分布,GIS,中国
Abstract:
基于人居环境自然评价的需要,运用GIS技术,采用窗口分析等方法,提取了基于栅格尺度(10km×10km)的中国地形起伏度,并从比例结构、空间分布和高度特征3个方面系统分析了中国地形起伏度的分布规律及其与人口分布的相关性。研究表明中国的地形起伏度以低值为主,63%的区域低于1(相对高差≤500m);空间分布呈现西高东低、南高北低的格局;随着经度和纬度增高,地形起伏度呈逐渐下降趋势,28oN、35oN、42oN纬线和85oE、102oE、115oE经线上的地形起伏度符合中国三大阶梯的地貌特征;随着海拔高度增加,地形起伏度呈现逐渐升高趋势。实证分析表明中国的地形起伏度与人口密度有较好的对数拟合关系,拟合度高达0.91;全国85%以上的人口居住在地形起伏度小于1的地区,在地形起伏度大于3的地区居住的人口总数只占全国0.57%。中国地形起伏度与人口分布的相关性区域差异显著,东北、华北、华中和华南等地相关性显著,内蒙古与青藏地区几乎不存在相关性。
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