物種入侵問題近年來已成為國內外極重視的研究課題。本研究旨在從「空間格局」的角度，探討物種入侵擴散之過程與機制，並根據入侵擴散之空間格局，判定重要的策略點，進而提出因應措施。研究對象與地區，則以目前國內銀合歡入侵擴散甚為嚴重且地形環境不太相同之澎湖群島和恆春半島為例，除了分析該二地區入侵擴散之過程與機制之外，並評估其差異性、空間格局類型及因應措施。由於物種入侵計畫涉及的面向較廣，故本研究擬以二年時間執行此項計畫。第一年計畫以澎湖地區的銀合歡為主，項目包括銀合歡判釋和分佈圖之繪製、地景指數於空間格局和地景變遷分析之應用、入侵與擴散空間格局之分析、入侵擴散重要策略點之判定與劃設、以及因應措施之提出等；第二年計畫則以恆春地區的銀合歡為主，研究項目與第一年計畫大致相同，但主要目的是在將恆春地區所得結果與第一年計畫之澎湖地區結果做比較，供評估銀合歡於不同地區之入侵擴散差異性、空間格局類型及因應措施等。本研究預期效益為驗證應用「空間格局」監測銀合歡入侵擴散之可行性，並評估澎湖和恆春二地區銀合歡入侵擴散之差異性及其空間格局類型，進而提出因應措施，提供國內有關單位處理銀合歡入侵擴散之參考。
The issue of species invasion has been growing concern recently. The objective of this study is to investigate the process and mechanism of species invasion from the point of “spatial pattern”, and also to determine the strategic points and provide the alternatives based on the invaded spatial pattern of Leucaena leucocephala. The study sites are located at Penhu and Henchun area where Leucaena leucocephala has caused the serious impact on these two different terrain sites. Therefore, in addition to analyzing the process and mechanism of species invasion, the invasion difference, spatial pattern types, and the proposed alternatives at these two sites are also evaluated. This study is expected to achieve the goal in two years. The first year aims at the Penhu’s Leucaena leucocephala. The research items include (1) interpreting and generating the spatial distribution map of Leucaena leucocephala, (2) applying landscape indices on the analysis of spatial pattern and landscape change, (3) analyzing the spatial pattern of invasion and dispersal, (4) determining the important strategic points of invasion and dispersal, and (5) proposing alternatives. The second year aims at the Henchuan’s Leucaena leucocephala. The research items are almost similar to the first year. Only one item is enhanced, that is, the result obtained from two research sites will be compared and assessed on the invasion differences and spatial pattern types, and also the proposed alternatives. The expected results from this study are (1) to identify the feasibility of ‘spatial pattern’ concept on monitoring the invasion and dispersal of Leucaena leucocephala, (2) to assess the invasion difference and spatial pattern types between two research sites, (3) to propose feasible alternatives to the related units which have to deal with the issue of invasion and dispersal of Leucaena leucocephalal.
