SOILS OF A MANGROVE FOREST COMPOSED OF Rhizophora mucronata AND Bruguiera gymnorrhiza FROM ISHIGAKI ISLAND, JAPAN

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Soils of a mangrove forest composed of the two main species of Rhizophora mucronata and Bruguiera gymnorrhiza in the Nagura estuary, Ishigaki Island, Japan, were studied with special reference to the difference in some properties of soil of the two species. Compared with those under B. gymnorrhiza, the soils of the mixed forest dominated by R. mucronata showed higher levels of water-soluble bases, especially sodium, and electric conductivity, suggesting that R. mucronata can tolerate and grow on more saline conditions of soils than can B. gymnorrhiza. Contents of pyritic iron and sulfur were higher in the soils of the mixed forest dominated by B. gymnorrhiza, where anaerobic conditions were more pronounced probable due to the supply of relatively high amounts of organic debris. There was little difference in the clay mineralogy, but in the slit and sand fractions, aragonite and calcite were abundant in the soils of the mixed forest dominated by R. mucronata.
社団法人日本土壌肥料学会の論文