<![CDATA[Mangrove forest ecosystem is a type of forest that are mostly located along the coast or a river that survival is affected by the tide. Ecosystems mangrove in village II of sembilan island has long used surrounding peoples for land aquaculture and firewood. This research aims to determine the structure and composition of mangrove vegetation, water quality, soil pH conditions and the substrate. This research is done in March 2016 till May 2016. The research was conducted sampling analysis of vegetation transect method. Mangrove species found in the research is 27 species of 12 families. Mangrove density value at station I 4700 ind/ha, station II 4767 ind/ha, station III 4067 ind/ha, station IV 4800 ind/ha, station V 3667 ind/ha. Based on living environment minister No. 201/2004, the density of mangrove in village II of Sembilan Island included in the category of very dense (both categories). The quality of physical and chemical water, for the parameters temperature range of 29-30°C, the current velocity 0,045-0,017 m/s, pH of the water 7.03-7.33, salinity 24-26o/oo and soil pH 6,59-7,21. The value is still quite ideal (optimum) for mangrove growth. Mangrove substrate types in this research is loam, clay, sandy clay loam, and sandy clay.Key Words : Mangrove, Sembilan island, Substrate, Water quality]]>
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