APPLICATION OF REMOTE SENSING AND GIS ON THE DISPERSAL OF LEUCAENA LEUCOCEPHALA IN HENGCHUN PENINSULA

摘要

The issue of invasive species has been growing concerns recently. In Taiwan, Leucaena Leucocephala has invaded the native ecosystems and caused a serious problem in Hengchun Peninsula. Therefore, this study focuses on applying remote sensing and GIS to study the dispersal of Leucaena Leucocephala in Hengchun Peninsula. The research process includes (1) generating the land use map and the distribution map of Leucaena Leucocephala in 1994 and 2006 based on the integration of remote sensing and GIS; (2) investigating the effect of Leucaena Leucocephala dispersal on the landscape of Hengchun Peninsula via landscape structure indices and Shannon diversity t-test; (3) analyzing the significant landscape factors which are related to the dispersal of Leucaena Leucocephala through the logit model. The result is as follows. The land use map and the distribution map of Leucaena Leucocephala in 1994 and 2006 generated by remote sensing and GIS are acceptable after the accuracy assessment of test area. The result of Shannon diversity t-test indicates that the dispersal of Leucaena Leucocephala from 1994 to 2006 has significant effect on the landscape of Hengchun Peninsula. As for the selection of significant landscape factors using the logit model, the result shows that the dispersal of Leucaena Leucocephala are strongly related to four landscape factors such as slope, the distance from the seashore, the distance from the road, and the distance from Leucaena Leucocephala. Those factors are very important for the occurrence of Leucaena Leucocephala. The above results can be extended to the related forest units and National Park for a reference of the dispersal of Leucaena Leucocephala in Hengchun Peninsula.