地形梯度视域下的云南山区土地利用时空格局变化研究

Study on Spatial and Temporal Patterns of Land Use in Mountainous Areas of Yunnan Province from Perspective of Terrain Gradient

以2000、2005、2010、2015年4期云南遥感影像数据和DEM数字高程数据为基础,从地形梯度视域出发,筛选构建了地形起伏度、地形位指数、分布指数等为主的方法,揭示了云南山区土地利用梯度分布变化规律,结果表明:从静态分布看,土地利用类型在不同的地形梯度视域下分布特征明显。从动态变化看,2000~2015年各地形梯度区耕地、林地、草地面积不断减少,水域、建设用地、未利用地面积持续增加;6个地类中耕地与建设用地空间竞争最为激烈。未来应结合土地利用梯度时空分布规律,合理安排各类用地,以保障粮食生产和生态安全,促进山区人地关系协调发展。

Based on remote sensing image and DEM data of Yunnan in the four periods of 2000,2005,2010 and 2015,the methods of constructing topographic relief,topographic position index and distribution index were selected to reveal the distribution law of land use topographic gradient in mountainous areas of Yunnan.The results showed that:the gradient distribution character?istics of land use types are obvious in different terrain gradient horizon from the static distribution point of view.From the trend of dynamic change of view,the area of cultivated land,woodland and grassland in all terrain gradient areas decreased continuously and the area of water area,construction land and unused land increased continuously during 2000~2015.Among the six land types,the space competition between cultivated land and construction land was the most intense.In the future,in order to ensure food production and ecological security and promote the coordinated development of human-land relationship in mountainous are?as,we should rationally arrange all kinds of land use according to the spatial and temporal distribution law of land use gradient.