Mangrove soils are formed by the accumulation of sediment derived from coastal orriver bank erosion, or eroded soils from higher areas transported down along riversand canals. Some may originate corn the sedimentation of colloidal materials andparticulates. Sediments that have accumulated along the coast and in mangroves havedifferent characteristics, depending on their origin. Sediment from rivers and canalsis fine muddy soil, while coastal sediment is mainly sand. The degradation oforganic matter deposited through time is also part of mangrove soils. Based on astudy by Khemnark et al., (1987), conducted on mangroves at Phang-Nga and BanDon Bays, mangrove soils were classified into 3 major groups, as follows:
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