基于水文站划分的子流域土地利用变化时空特征分析——以密云水库上游白河流域为例

以密云水库上游的白河流域作为研究对象,基于1980年代中后期和2000年2期土地利用现状,借助GIS工具,分析了白河流域及其子流域的土地利用变化规律,明确了土地利用变化的主要类型和方向及各个子流域土地利用变化对白河流域土地利用变化的贡献。主要结论如下:1980年代中后期到2000年期间,除林地面积有所增加外,其余各类土地利用面积均在减少:草地转林及退耕还林构成了白河流域土地利用变化的主导过程,其中云州水库小区域与下堡小区域是对土地利用变化过程贡献最大的2个子流域,张家坟流域是对白河流域保持自稳定性土地类型贡献最大的子流域。

Analysis on land use change of subbasins in Baihe basin based on GIS

Supported by land use condition in upperl980s and 2000s bascd on GIS,land use change was analyzed from upper 1980s to 2000s.The main type and amount of land use change was obtained,in addition.the contribution of land use change of subbasins to Baihe basin was also known.The main results as follows:the forest land area increased but others decreased.The increase of forest land which came from grass land and arable land was the main characteristics of laad use change in Baihe basin.In conclusion, the degree of land use change in Yunzhou subbasin and Xiabao subbasin was thc strongest and Zhangjiafcn subbasin kept most part of self-steady land.