Estimation of vegetation net primary productivity of Beijing Yeyahu wetland based on remote sensing

Yeyahu wetland is an artificial wetland which located in the northwest of Beijing city. It is one suitable place for educational activities and recreation for local people and can also provides other functions like water storage, transformation of nutrients, growth of living matter for surrounding ecosystems. But with the highly development of social-economy, this fragile ecosystem had become imperiled due to rapid urbanization and industrialization. For further protection of the valuable wetland resources, the value of major function as its capabilities of providing habitant for field animal was evaluated. In this paper, Landsat TM Images were geometrically corrected and other geo-data like DEM and climate data of Beijing area were collected. The field survey was also conducted and six plant percentage cover sampled in 1×1m quadrate evenly located in the study area. Assumed that the dry weight of the fully growth plant in August can highly represent the net primary productivity of the Yeyahu wetland in 2008. The estimation model of vegetation net primary production based on remote sensing data and climatic data was build to estimate the NPP in 2008 of Yeyahu wetland.