基于地形坡面的土地覆被变化强度分析——以伊洛河流域为例

Intensity Analysis of Land Cover Change in Sope Units——A Case Study of Yiluo River Watershed

根据数字高程模型和土地覆被数据,运用GIS技术和强度分析等方法对2010—2020年伊洛河流域不同坡面的土地覆被变化进行研究。结果表明:(1)不同坡面的土地覆被变化强度是平地>缓坡>陡坡。所有坡面的草地,缓坡和陡坡上的建设用地和湿地,以及平地上的林地和陡坡上的耕地是高强度变化类型,其转入与转出强度皆大于随机均匀变化强度。(2)平地上建设用地扩增"指向"草地,"避让"湿地,耕地对建设用地的转出是高强度转出类型;缓坡和陡坡上不同土地覆被类型两两(如耕地和建设用地)之间频繁发生位置对换,土地覆被变化主要表现为系统性的高强度变化类型。

Based on DEM and land-cover data,this paper explored land cover change intensity from 2010 to 2020 in different terrain slope units of Yiluo River Watershed exerting intensity analysis methods and GIS technologies.The results showed that:(1)The land cover change intensity was,in sequence,flat unit>gentle slope unit>steep slope unit.At category level,grass land in all three slope units,built land and wet land in both gentle slope unit and steep slope unit,as well as forest land in flat unit and cultivated land in steep slope unit,were land cover categories experienced significantly greater change intensity,and they were both active gainers and active losers compared to random uniform change intensity.At transition level,in flat unit the largest transition was from cultivated land to built land.(2)Regarding the given loss of cultivated land,it tended to lose intensively to built land,more so than to the other categories.And the gain of built land targeted grass land,but avoided wet land.In both gentle slope unit and steep slope unit location swaps often occurred systematically in much more intensity between two different land cover categories,for example cultivated land and built land.