本研究利用1982、1992、2003、2007年四個時期的航空照片，透過正射糾正、人工判釋、螢幕數化、套疊分析與地理資訊系統相互配合，以尖山、後灣、關山、大尖石山等四區域為研究範圍，來監測恆春半島過去25年間之土地利用變遷的時間與空間變化情形，作為瞭解銀合歡之擴散現象與土地利用之關係。結果顯示，研究樣區中，森林面積分布皆達40%以上，其中以尖山樣區最高，後灣地樣區較低；農作面積分布，以後灣及關山樣區較高，面積分布約有14%，大尖石山樣區居中，此區涵括畜牧草生地，其面積分布約有12%，尖山最低，農作面積分布只有4%。各土地利用型面積比例之時間變化程度1982~2003年大於2003~2007年，以1982~2003年間森林面積消長最大，主要原因為全民造林運動及銀合歡擴散。值得注意的是1982~2007年間裸露地、道路與建築物明顯增加，有助於形成銀合歡之入侵基地。
The aim of this study was to analyze the land-use and the distribution of L. leucocephala in time and spatial change. We used four periods aerial photographs: 1982, 1992, 2003 and 2007 to monitor the temporal and spatial land-use change over the past 25 years in Jian Mountain, Hou Bay, Guanshan, and Dajianshih Mountain in southern Taiwan. The aerial photographs were processed by GIS facilities such as scanning, ortho-rectification, image assembly, photo interpretation, digitizing, and overlay analysis. The results show the forest distribution were about 40% of the study area. The largest and the smallest were Jian Mountain and Hou Bay area. The distribution of farm area of the Hou Bay and Guanshan area were about 14%, while Jian Mountain only has 4% distribution. The land-use of the temporal variation degree during 1982 to 2003 was larger than from 2003 to 2007. From 1982 to 2003, the distribution of forest area increased considerably due to plantation and the L. leucocephal spread. The exposed sandbank, road development and increase in construction influenced the spread base of L. leucocephal to invade from 1982 to 2007.
