区域土地利用变化的水分生态安全响应研究——以晋西陕北黄土高原为例

Analysis on water eco-security responding to regional land use change:A case study in west Shanxi and north Shaanxi in the Loess Plateau Region

目的探讨晋西陕北黄土高原土地利用变化的水分生态安全响应。方法采用定量方法,借助于GIS空间分析技术,结合研究区1989和1999两年的土地利用分类图,定量评价晋西陕北黄土高原不同土地利用类型水分的生态安全状况。结果利用构建的土地利用水分生态安全指数,确定区域土地利用变化的水分生态安全响应。结论①从研究区整体来看,不论是水分状况差的1989年,还是水分状况较好的1999年,土地利用类型水分生态安全指数逐渐降低的顺序均为林地、耕地、草地;②依据各分区不同土地利用类型的水分生态安全指数排序,确定各分区的农业发展方向。

Aim To reveal the water eco-security responding to regional land use change in west Shanxi and north Shaanxi in the Loess Plateau Region. Methods Through the quantitative methods and GIS technique, combining the classification map of land use and cover type of 1989 and 1999, setting up an index WESI （ Water Eco-Security Index）, the ecological risk of the water of the land use and cover type is calculated. Results The eco-function and the agriculture direction are ascertained. Conclusion ① for the whole study area, the order of WESI for every main land use type, from high to low, is woodland, arable land and grassland, implying its conditions favorable for pastoral practiees;②according to the order of every main land use type, the eco-function and agriculture direction are ascertained.