Abstract: Based on the method of corresponding determination of ground hyperspectral and aboveground biomass,biomass model of ground spectrum of grassland and wetland was built and used to calculate ecological carrying capacity of grassland and wetland. The results showed that variation range of yield of grass was from 2.002×10⁸ kg to 6.650×10⁸ kg,the average was 4.603×10⁸ kg. The highest year was 2002,which was 3.3 times than the lowest year 2007. The utilization rate of forage grass directly influenced ecological carrying capacity of Huihe natural reserve. Driving analysis of ecological carrying capacity showed that appropriate high temperature of spring season（April to May）,relatively low temperature of growing season （June to July）,and higher precipitation of summer season （June to July） were the 3 major factors affecting ecological carrying capacity.Spatial pattern was obvious,high productivity area mainly distributed in Huihe flood plain-neighboring region and eastern region of natural reserve. In year of high ecological carrying capacity,spatial heterogeneity of primary productivity level was also high,performing as high patch density and big dominant level patches. But in year of drought,spatial heterogeneity of primary productivity level was also low,performing as low patch density and small dominant level patches. Ecological carrying capacity of grassland and wetland was affected by grassland area,utilization rate of forage grass,and climate factor. So scientific and rational regulation should be applied to grassland area,utilization rate of forage grass to enhance ecological carrying capacity of grassland and wetland and promote sustainable development of Huihe National Nature Reserve.

Key words: ecological carrying capacity, sustainable development, biomass model, Huihe national nature reserve