Land Use Eco-security Evaluation Based on GIS in the Typical Agro-pastoral Zone

According to the factors of eco-insecurity and the purpose of land use eco-security evaluation of the studying area, we chose several indexes from the security of land desertification and security of soil erosion, and constructed the safe composite index of the eco-security and the method of evaluation. Land use eco-security evaluation was carried out in the study area on the basis of GIS. Main results from this study are as follows. The secure status of land desertification in the studying area got better from 1985 to 2000, but the area of extreme insecure and insecure region of land desertification was still heavy, nearly accounting for 30% of the whole area; The soil erosion in the studying area between 1985 to 2000 did not become better, the central and west regions still remained the serious area of soil erosion, and strong water and soil conservation measures must be taken. The average ESSI in this region is not leveled at secure, figuring at 2.7 in 1985 and 2.66 in 2000.