The phytosociology of forest vegetation on Ulreung-do, Korea
Jong Won, Kim
The forest vegetation of Ulreung-do, an island situated between the Korean peninsula and Japanese archipelago, was investigated phytosociologically. Beech (Fagus multinervis Nakai) forest represents the summergreen broad-leaved forest zone of the island and was identified as an endemic association for Fagus forest syntaxonomically. Although the island is small and narrow, there is a zonal distribution of three types of forest vegetation, the summergreen broad-leaved forest, the evergreen needle-leaved forest, and the evergreen broad-leaved forest. Their distribution patterns were illustrated by means of the ratio of evergreen species (Eg(t)) and summergreen species (Sg(t)) and the warmth index (WI) according to altitudinal changes. The vertical distribution of the Ulreung-do vegetation was scarcely correlated with any specific WI value (WI 85, 100) but preferably with local relief at its altitude.