陕北黄土高原土地评价研究

A land evaluation Information system in the loess plateau of northern Shaanxi province

通过建立陕北黄土高原土地资源信息系统中的数据库、模型库和知识库,进行了该地区土地评价研究,并进行社会和经济可行性分析。评价结果可作为陕西省土地利用规划的依据。

Using a raster approach,the study area is divided into 5704 cells (3.75×3.75km) for extracting data.Then,a land resource information system is developed.The array of data cells in a grid information system is constructed by overlaying the desired map with a grid. According to the land evaluation results,land suitability for farm- land,forest,and pasture land make up 24.51%,29.13%,and 28.32% respec- tively of the study area.But the current land use for farmland,forest, and pasture land occupy 27.09%,27.69% and 26.78% respectively of the study area.At present,emphasis must be given to adjust land use accor- ding to land suitability.Because of the erosion hazard,land should not be used for farmland when slopes exceed 15 degree.Engineering techni- ques shouId be made in arable lands.The steep cultivated slopes must be abandoned in favour of sown grass and planted trees.