海岸林地為海岸地區重要的自然屏障，其具有減少強風、飛砂、海潮及鹽霧等危害，並能改善臨海鄉鎮惡劣生活環境、生態保育與國土保安等不同於其他林地使用之公益功能。對於屬於海島型國家之台灣而言，海岸林地變遷議題無論在實務規劃或研究探討面上都有其必要性與重要性。

近年來土地使用變遷相關研究多集中於變遷模擬與都市土地變遷情形。然而，對生態環境系統有正面效益之林地流失鮮少受到重視，其中海岸林變遷研究僅著重於林木本身，缺乏整體了解海岸林之結構特性。景觀生態指標(Landscape ecological metrics)為近年來常被運用作為分析景觀格局空間與時間變化之方法，其提供一個定量方法評估土地使用變遷情形，並透過這些指標衡量景觀結構特性。在考量海岸林地使用變遷有多種影響變數之情形下，本研究參考DSR架構建構適合海岸林地使用變遷之DSR架構，並利用多元迴歸分析，以宜蘭縣與屏東縣沿海為研究地區，企圖瞭解過去少被討論的海岸林地結構特性與海岸林地使用變遷之間的關係。

爰此，本研究目的有三：(1)檢視研究地區海岸林地使用變遷情形；(2)結合海岸林地結構特性與景觀生態指標，歸納出適合用來計算之海岸林地結構特性的指標；(3)利用多元迴歸模型，探討海岸林地結構特性與海岸林地使用變遷之因果關係。

研究結果顯示，宜蘭縣與屏東縣海岸林地皆呈現減少趨勢；而多元迴歸結果顯示，平均嵌塊體形狀指數、平均嵌塊體碎形維度、邊緣密度、平均嵌塊體大小均對兩研究地區之海岸林地使用有顯著影響，其中面積與周長結構特性之指標影響程度較大。本研究結果期望未來相關海岸地區規劃或計畫擬定，可藉由本研究之分析，進行更適當之研擬。

Coastal forest which can reduce strong wind, sandstorm, tide and salt mist is an important natural barrier in the coastal areas. It can also improve the worse coastal environment and conserve ecology. With regard to Taiwan, which is an island country, the change of coastal forest issues are necessary and important not only in an aspect of planning but also in research.

In recent years, research on land use change mostly focuses on simulation change and urban land use change. Coastal forest which has positive benefits on the ecological environment; however, forest loss is rarely taken seriously. The study of coastal forest change only focuses on itself, but it lacks of understanding of the structural characteristics of coastal forest. Landscape ecological metrics is a method that is often used to analyze the landscape pattern changes in space and time. It provides a quantitative method to estimate land use change. And we use these metrics to understand the structural characteristics of coastal forest. Considering coastal forest land use change have many impact variables, we refer to the DSR framework to establish the system of coastal forest land use change. And we use multiple regression model to understand the relationships between structural characteristics and coastal forest land use change in Yilan and Pingtung.

Our research purposes can divide for three parts: The first, survey coastal forest land use change; second, combine the structural characteristics of coastal forest with landscape ecological metrics, and induce the indicators suitable for the coastal forest structural characteristics; the third is to discuss the relationships between structural characteristics and coastal forest land use change by multiple regression .

The results of research show that Yilan and Pingtung coastal forest all showed a decreasing trend. mean shape index, mean patch fractal dimension index, edge density and mean patch size have a significant effect of the two study areas in the coastal forest use, especially area and edge of structural characteristics for the coastal forest use changes have more direct impact. In the future, coastal planning or regional planning can use the analysis of this study to pursue more appropriate planning.

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