Wetlands are rich in biological diversity and high productivity of the ecosystem,they play an important role in ecosystem carbon cycle.Wetland vegetation net primary productivity(NPP)is an important indicator of the health of wetland ecosystems.In this paper,combined with field surveys,laboratory measurement and remote sensing technology,the three kinds of typical wetland vegetation——Spartina alterniflora,Phragmites australis and Scirpus mariqueter NPP were studied in Shanghai Chongming Dongtan.Firstly,sele...