Basic study on the forest ecosystems in Amami Islands, a World Natural Heritage candidate, Kagoshima, Japan ―Kagoshima University Satsunan Islands Forest Ecosystem Research Group―


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  • 世界自然遺産候補地奄美群島の森林生態系に関する基礎的研究 ―鹿児島大学薩南諸島森林生態研究グループ―


<p>We conducted the vegetation survey by using the tree census plots of old-growth forests on the islands of Amami- Oshima and Tokunoshima, both of which are World Natural Heritage candidates, Amami Islands, Kagoshima Prefecture, Japan. Here, we report the results of the trees and the forest floor plants that make up the native laurel forest at the three altitude points (200, 400, and 600 m) of Amami Oshima. Trees individuals (DBH > 4.8 cm) were confirmed as 52 species of 2728 trees in the monitoring plot at an elevation of 200 m, 64 species of 2652 trees at 400 m, and 53 species of 3813 trees at 600 m. The results of the distribution pattern of large-diameter trees suggested that the 400 m survey area was in a more advanced succession stage than the other monitoring plots. In the 200m plot, the coverage of the shrub layer varied greatly depending on the micro-topography: ridge (about 72 %), slope (about 68 %), valley (about 54 %). On the other hand, the vegetation coverage in the herbaceous layer showed an opposite pattern, with larger in valleys. Appearing species were 39 fern plants, 12 herbaceous plants, 27 shrubs, 26 high trees, and 13 vines. The number of species of fern and herbaceous plants was highest in the valleys, and the number of species tended to decrease as they transfer from the slope to the ridge. On the contraly, it was found that shrub species and woody species have the highest number of species on the slope and relatively few in the valleys and ridges.</p>



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