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选择兰州市中心城区为研究区域,结合分类决策树自动提取的土地利用信息,利用DEM数据获取地形因子,定量分析兰州市各地形分级单元内的土地利用空间格局特征.结果表明:80%以上的城乡及工矿用地以及90%以上的水域分布在较低、较缓的区域,60%的林地和草地分布在较高、较陡的区域,约50%的未利用地分布在高程<2 000 m、坡度<15°区域内,可以考虑一定程度的开发利用;高程<1 600 m,坡度5°~8°区域内,景观最为破碎,形状最不规则,生态环境最为脆弱;高程1 600~2 000 m、坡度8°~15°区域内,土地利用景观类型最为丰富;高程>2 800 m的区域内,同类型土地利用景观不断集中、合并,土地利用景观的整体性最强.
The central city of Lanzhou was selected as the study area, combined with the land-use information automatically extracted from the classification decision tree, and the topographic factors were obtained using DEM data to quantitatively analyze the land-use spatial pattern characteristics in the various types of hierarchical units in Lanzhou City. The results showed that: 80% or more Urban and rural areas, industrial and mining land, and more than 90% of waters are distributed in lower and slower areas, 60% of forest lands and grasslands are distributed in higher and steeper areas, and about 50% of unused land is distributed in elevations < 2 000 m. In a region with a slope of <15°, a certain degree of development and utilization can be considered; in an area with an elevation of <1,600 m, a slope of 5° to 8°, the landscape is the most fragmented, the shape is the most irregular, and the ecological environment is the most vulnerable; elevation 1 600-2 In the area of 000 m and slope of 8°~15°, the land use landscape types are the most abundant; in areas with an elevation of >2 800 m, the land use landscape of the same type is continuously concentrated and merged, and the land use landscape is the most integrated.