The Relationship between Landscape Change and Invasion of Leucaena leucocephala in Kenting National Park

• Main Authors: Wu, Kun-Jen, 吳坤真
• Other Authors: Chen, Chaur-Tzuhn
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/h96e2r

碩士 === 國立屏東科技大學 === 森林系所 === 98 === Kenting National Park (KTNP) is located on the most southern part of Hengchuen Peninsula in Taiwan. The land-use change of this area has resulted in a great spillover by Leucaena leucocephala which has become a serious invasive alien species. With 25-year management history, KTNP administration office has been constantly developing some new scenic spots and recreation areas for tourism purposes, which have led to an increase of visitors and a shift of economic activities and some ecological impacts as well. Now, the landscape fragmentation and alien invasion species have been identified as fundamental reasons for biodiversity degradation. The purpose of this study is based on the landscape change data to explore the impact of landscape structure on the invasion of Leucaena leucocephala after landscape changes. The multi-temporal SPOT satellite images of the years of 1988, 1997 and 2009 were collected to classify the land use types with maximum likelihood method. The territory of the land use change areas and index of landscape in different periods were calculated for studying the effects of land use change on the variation of landscape structure. By using the aerial photographs to map invasive distribution of Leucaena leucocephala and explore the land use types and land use zoning of their invasion conditions, and then compute landscape index and the area proportion of Leucaena leucocephala to explore the independency of the degree of landscape fragmentation and the degree of invasion of Leucaena leucocephala with chi-square analysis. Besides, correlation analysis was used to explore the relationship between the area ratio of Leucaena leucocephala and landscape index change. The results of this study have shown that the largest area is high-density vegetation which covers 8104.36 ha, and the low-density vegetation area is reduced to 465.34 ha due to transforming into the mid-density vegetation (47.11%) and construction area (10.56%), the construction area and bared areas tend to increase in the development region within KTNP. In the aspect of landscape structure change analysis, the landscape fragmentation is the most in 2009. Among the land use types, the high-density vegetation is stable gradually. The mid-density vegetation and low-density vegetation landscape patches are fragmented due to hardware construction and crops cultivation. There is a greater change in the general control area and specific scenic area and less change in ecological protection area and historical area. The distribution area of Leucaena leucocephala was 872.3 ha in 2009. Invasion distribution in mid-density vegetation is the most about 609.02 ha and the general control area is about 819.54 ha. The proportion of Leucaena leucocephala and landscape index analysis showed that there is a relationship between the degree of landscape fragmentation and the invasion level of Leucaena leucocephala, The correlation analysis has shown that the correlation of the largest patches index is negative, while the Shannon's diversity index is with positive correlation.