A study of land cover change and its environmental index application

Prof. Lin, Chao-yuan

Taiwan was named as “Formosa” due to its plentiful forest resources back at the time. In addition, the mountainous landscape, high species diversity and the location of East Asian Monsoon along with high annual average rainfall of 2500mm per year together formed the unique Taiwan. Under the rapid population growth and limited land resources, many slopes have been developed continuously to farmland or residential area to satisfy the demands. Land use or/and land cover changes could lead to environmental issues such as flood, water pollution, and landslide. The consequent objectives of this three-year project are recognized, as shown in the following:

The first year project aims to analyze the change of land and water resources, thus examine the influential factors of major disasters in watersheds. The second year project aims to establish a management model on the hot spots of land use/land cover change in multi-scale perspectives, e.g. large scale (river basin), medium scale (management unit) and small scale (cadaster and pixel). The last year project aims to draft the strategic response to environmental change through three case studies that evaluate the potential area of deep-seated landslide in a watershed; identify the optimum groundwater recharge site screening for the significant subsidence watershed, and to discuss the spatial distribution change of carbon sequestration in a watershed.

In this study, the multi-aspect of environmental issues in a watershed such as a landslide, flood, wildfire, water resources conservation, grassland succession and wetland conservation will be analyzed by using environmental indices. According to the results, the driving forces and impacts from land use/cover change could be explored. Finally, an integrated stewardship model in the watershed for conservation and monitoring management’s will be established as a reference to authorities.

 

坡地土地變遷基礎資料建置及指標應用之研究
台灣早期因森林資源豐富,而有福爾摩沙之稱,且因位於季風氣候區,年降雨量可達2500公厘,加上高山林地之地理環境,生物種類亦具多樣性。然在人口密度快速上升及有限土地資源下,土地開發不得不向山坡地移動,山坡地之森林區位因人為開發轉為農地或建地,此變遷衍生出淹水、水質汙染及崩塌等環境問題。本研究擬於第一年完成全台土地及水資源之變遷分析,並探討其對集水區重大災害事件之影響因素;第二年將依序由大尺度之流域,至中尺度之管理分區,小尺度之地籍及網格等,建置土地變遷熱點區位管理模式;第三年以三種案例分析,包含集水區潛在深層崩塌熱點區位之推估、集水區地層下陷最佳地下水補注區位之探討、集水區碳吸存空間分布及變遷之探討等,作為因應環境變遷對策研擬參考之用。