진도 당재봉 일대 토지이용 변화에 따른 해안사구 식생변화

Abstract

The purpose of this study is to analyze the changesinvegetation andflora in the coastal sand dunes and rocks following land-use transformation between 2013 and 2019. The study area is located on Dangjae-bong(hill) on Jin-do island, South Korea andthe area has been developed from aforest area to a resort complex overthe last 3 years. It has been confirmed thatchanges in flora, with 5 species added in the year 2019,have occurred whencompared to the year 2013. Of the five species investigated, four were naturalized plants and one was a terrestrial plant. All of the five species were identified as invasive species, which were caused by the transformationin land-use. There was no change in the specific floristic species, but the number of changed naturalized plants increased from 3 to 7 species. The increase of naturalized plants instead of native plants seems to be the result of invasive species introduced into the coastal sand dunes due to the development and construction. Among the life forms, 7 types of dormant plants turned out to be distributed in the studied area. In the 2013 survey, the ratio of hemigeophytes (H) was the highest (34.04%), followed by geophytes (G), therophytes (Th) and homomorphic therophytes (Th(w)). However, in the 2019 survey, three out of five species were homomorphic therophytes, the second highest next to hemigeophytes. The costal dune vegetation was classified into 7 communities in the study area. There were changes of the dominance index and species compositions in vegetation between 2013 and 2019. With regard to changes in the abundance of plants, Carex kobomugi, Calystegia soldanella, and Lathyrus japonicus, all of which are the typical components of coastal sand dune vegetation, have decreased while Rosa wichuraiana and Vitex rotundifolia, which are naturalized plants and woody invasive species, have increased. The findings of this research demonstrate that frequent anthropogenic disturbances from the change of land-use in areasadjacent to the coastal sand dunes caused to alter the abundance of such species. However, it was confirmed that there were no changes in abundance of Limonium tetragonum, Suaeda asparagoides, and Zoysia sinica, which are found relatively close to the beach. This is deemed to bebeca use the most invasive species of the coastal sand dune areas are much less tolerant of salinity that intrusion into the areas affected by seawater does not allow their growth. As for the diversity of species, the diversity index ofthe 3 types was higher in 2019 than in 2013, but the gap of the plant species diversity index was very small. The increase in species diversity of dune vegetation is due to the invasion of coastal sand dunes due to land transformation rather than to the stability of vegetation.