부산대학교 도서관

This study focuses on the long-term dynamics monitoring of natural and artificial vegetation communities in Yun-Lin coastal plain. The observation period was from 1997 to 2001. Seven sampling plots, including three grasslands, two artificial windbreaks, and two secondary succession forests were examined. The observation results showed that species composition decreased yearly in grass lands but the variation of species in forest plots were very mild and even increased in some plots. Most grassland in Yuin-Lin coastal plain is in the early stage of secondary succession. Therefore, the species richness varied along with the seasonal changes and the dominant species occupied most of the space to restrain other species from expanding. The similarities of species composition of grass communities were 60% to 82% during the first two years and became to the lowest 29% to 50% while comparing the data from 2001 to 1997 by using Jaccard Index of Similarity in all sampling plots. The Jaccard Index of Similarity of forest communities are 53% to 58% except the Casuarina windbreak plot with the value of 46%. It shows that the variations of forests communities are more stable than those grassland communities. The dominant species in forests community changes gradually during the monitoring periods. The dominants of Casuarina equisetfolia in forests communities decrease year by year while Cerbera manghas and Ficus microcarpa instead. The replacement of dominant species can be found clearly in the five years dynamics in this long-term dynamics monitoring due to most vegetation are in the early stage of succession.