Remote sensing based estimation of Phragmites australis aboveground biomass in Shuangtai Estuary National Nature Reserve

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 Phragmites australis was 4.39 ×104 hm2 , accounting for 32.96%of the study area of the Shuangtai Estuary National Nature Reserve .Selecting NDVI as the variable for the power function , the authors formulated the optimal model for estimating AGB of Phragmites australis with an estimation accuracy of 79%.Average AGB of Phragmites australis was 4 785 .5 g/m2 and total AGB was 2.06 ×106 t.High values of AGB were observed in the northeast part , while low AGB values in the southwest .The results obtained in this study would provide data to support wetland ecosystem management and scientific guidance for Shuangtai Estuary National Nature Reserve .