Evaluation of grassland resources in Jingtai county basod on 3S technologies

The TM image data and field survey were used to investigate and evaluate the grassland resources in Jingtai. The grassland was classified into 4 classes, 5 groups and 7 types based on RS, GIS and GPS technologies and the grass yield estimation model was setup with NDVI (y=0.433 5e0.028 5x, R2=0.56). The area of natural grassland and the theoretical carrying capacity were 391.8 millions ha and 73.5 millions sheep units respectively. The current situation of grassland utilization was evaluated to provide the information for planning, protection and sustainable utilization.