By using the data of LANDSAT MSS/TM/ETM satellite and the Chinese environment and disaster monitoring satellite HJ-1A/B,the areal variation of mangrove coverage in the Jiulongjiang Estuary of Fujian province was investigated.Five multi-bands images were collected in 1976,1983,2002,2006 and 2010,respectively.The approach of maximum likelihood classification was used to detect mangrove from the images.It was found that the area of mangrove was likely decreasing during the period of 1970s-1980s(~60% drop).Reco...