Chukwamdee and Anunsiriwat (1997) estimated biomass of mangrove forest at Changwat Samut Songkhram. Their results showed above ground biomass sequestration with 75.96 tonnes mean while above ground biomass of more than 300 tonnes was also reported in mangrove forests in Indonesia (Komiyama et al., 1988). An above ground biomass of 341 tonnes was reported for an Avicennia marina forest (Mackey, 1993).