关键词: 土地利用结构, 沙漠化, 层次分析法, 动态评估, 内蒙古奈曼旗

Abstract: Taking Naiman Qi of the Inner Mongolia in the North of China as an example and based on the data of landuse changes obtained by remote sensing and GIS in four time intervals between 1985-2000, the authors determine the weight values of the influences from different landuse patterns on desertification processes by analytic hierarchy process. Furthermore, the integrated influences of landuse structure on desertification in the region are quantitatively described using the cha racteristic index of landuse structure put forward by Ni Jinren et al. This method can be used to assess the dynamic changes of desertified lands through analyzing the changes in the characteristic index of landuse structure in the study area and thereby provide a scientific basis for the developmental planning of the region. The results achieved from this study enrich the assessment method of la nd desertification and have a certain theoretical significance. The application of the method in Naiman Qi showed that the characteristic indexes of landuse structure calculated from different periods of landuse structure are negatively correlated with desertified land area obtained by remotely sensed monitoring. The conclusions obtained from present dynamic assessment of desertification are essentially coincident with the monitoring results, and thus demonstrate the rationality and effectiveness of the method.

Key words: landuse structure, desertification, analytic hierarchy process, dynamic assessment, Naiman Qi, Inner Mongolia