With the object- oriented classification method,the spatial distribution of Phragmites australis was obtained based on multi- temporal Landsat8 OLI data covering Shuangtai Estuary National Nature Reserve. By analyzing the sensitivity between different vegetation indexes and aboveground biomass( AGB) of Phragmites australis,the retrieval model of AGB for Phragmites australis was developed. Furthermore,the spatial pattern of AGB for Phragmites australis was observed. The results showed that the area of Phragm...