| Summary: | 碩士 === 國立屏東科技大學 === 森林系所 === 96 === Leucaena leucocephala (Lam.) de Wit. has been recognized as the most effectively invasive woody plant in Taiwan. Due to its strong reproduction and alleopathy, it has been a dominant invasive species in Henchun peninsula and caused negative impact to the biodiversity of the forest ecosystem. Currently the investigations into the invasive alien plants mostly rely on the application of aerial photography to monitor and to make a distribution map to study the dispersion of L. leucocephala. Therefore, aerial photography detection of plants has been used by many ecologists and land managers as a primary solution to invasive alien species. The aim of this study is to analyze the land use and the distribution of L. leucocephala in different years by utilizing the aerial photos of Jian Mountan, Hou Bay, Guanshan, and Dajianshih Mountain area which were taken in 1982, 1992, 2003 and 2007. The speed of dispersal and the competition of L. leucocephala with Acacia confusa Merr. were also studied. The result indicated that forest area had increased in 1992 to 2003 due to the dispersal spread of L. leucocephala and afforestation, and in 2003 to 2007 there were significant increase of the bare area which may become the base habitat for the invasion of L. leucocephala. Also according to the aerial photos taken from 1982 to 2007, L. leucocephala is continuously dispersing, and the average speed of its dispersal was 3.55 ha year-1. Meanwhile, the aerial photos also showed that A. confusa is gradually replacing L. leucocephala in these regions.
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