本文結合政治生態學視角和延展都市化概念，分析翡翠水庫建設與臺北水源特定區的劃設，如何以供水驅動的延展都市化，將坪林捲入水源保護區的領域治理。作者運用官方檔案和新聞資料，兼以參與式觀察和居民訪談，描述坪林因領域調控而起的轉變。作者指出，水源保護的領域治理乃仰賴空間治理計劃下的土地使用管制、污染防治，以及作為補償的水源回饋金等三種調控策略。晚近的觀光發展則開啟了保育與生計的新協商場域，但難以避免延展都市化導致的內蘊張力。

This study applied the perspective of Urban Political Ecology and the concept of extended urbanization in an analysis of the establishments of the Feitsui Reservoir and Taipei Water Source Domain, showing that how Pinglin District was involved in the process of extending urbanization driven by water supply. Official documents, historical news, firsthand interviews and field observation were performed to depict the social-spatial transformation and the territorial governance of Pinglin. The study revealed three main strategies for territorial governance of water source protection: compensation for local residents, techniques of pollution governance and land use regulations imposed by spatial planning projects. In recent years, tourism development has provided opportunities to re-negotiate the two diametrical poles—conservation and local livelihoods—the tensions within the process of extending urbanization still remained.