The present research takes a utilization and preservation stance in its examination of how mangrove forests on lriomote Island have been used by the residents of the region and the historical factors relating to this. Iriomote Island's mangrove forests are closely associated to general life on the islands and have been used for dyeing, lumber, food, recreation, and appear in folk songs. The natural use of these forests by the residents can be traced back to traditional common use customs in the Ryukyu Dynasty. The essence of this common use is recycled - use based upon a sustained yield principle for natural resources. This way of thinking survived among the people of the region throughout the war and is thought to have been a factor in maintaining sustainable, cyclical use and preservation of the mangrove forests.

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The topographical classification and vegetation characteristic of Shinduri coastal sand dune in Taean coast assigned as National Monument No.431 by Cultural Properties Administration on November 30, 2001 were investigated. Sand dune is topographically classified into forested dune area, coastal grassland zone and wet dune area, of which the area is 57.5 %, 23.9 % and 1.7 %, respectively. Also, sand dune is floristically composed of 28 families, 67 genera, 75 species, 1 subspecies, 11 varieties and 1 hybrid, and total 88 taxa. In various floristic composition Gramineae (19 species), Leguminosae (13 species), Compositae (10 species), Polygonaceae (6 species), Cyperaceae (5 species) and Rosaceae (5 species) compose of 66 %. Also, the naturalized percentage is 13.6 %, which is somewhat higher than the average (13.6 %) of mountain area in Korea, and many inland plants is invading.

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To provide the basic informations about conservation and management of coastal sand-dune, we surveyed terrain characteristics of coastal sand-dune, install effectiveness of sand fence and growth characteristic of Japanese black pine around the beach of Taean national park. The results are as follows. Japanese black pine forest was located in back of front sand-dune at Sambongand Gijipo beach which the sand fence have been established. The rearing district of the herbs plant is distributed in the interval of the beach. About the install effectiveness of sand fence, accumulated sand volume was increased proportional to supplied volume of sand at Sambong beach. Accumulated sand volume of Gijipo beach had plenty in front sand-dune. As growth characteristics of coastal pine forest, shape ratio is high from 82.8 to 86.3 compare with a total average 84.0 and has no difference by stand density. Annual intercalary growth of the coastal pine forest was very high for high density stand last 20 years, however, the difference by density did not exist during the last 5 years.

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