Abstract: The land use change and its ecological effect in Huhhot City from 1987 to 2004 were analyzed, based on 3S technology and relevant models. The results showed that grassland and cropland were the main land use types in Huhhot City. During the study period, cropland and construction land had an increased area, while other land use types were in adverse. Cropland expanding and vegetation restoration were the two major trends of land use pattern change. The eco-environmental quality index in 1987-2004 increased from 0.401 to 0.408, suggesting that the eco-environment quality was improved in a certain extent. Forestation and grassland-planting were the main driving factors of eco-environmental quality improvement, with the contribution ratio of 25.30%; while cropland expanding was the main driving factor of eco-environmental quality exacerbating, with the contribution ratio of 20.50%. The differences in eco-environment quality change were spatially remarkable. Qingshuihe County got the fastest improving speed of eco-environment quality, which was resulted from the transferring of cropland to woodland and grassland, with the contribution ratio of 57.89%. The eco-environment quality of Wuchuan County decreased most rapidly due to cropland expanding, with the contribution ratio of 62.15%.

Key words: Ectomyrrhizal fungi, Resource, Ecological distribution, Pine forest, Huangshan Mountain district