本研究以生長狀況最為完整的觀新藻礁為研究區域，此區早期主導生物是石珊瑚，約7500年前開始發育於古石門沖積礫石扇上，約4500年前珊瑚藻成為主要造礁生物，範圍從最北大潭電廠至最南永安漁港，沿岸約5km，為小飯壢溪、新屋溪、後湖溪三條野溪之出海口。本研究選擇三點相距2.5km的測量點，自2018年11月至2019年04月，進行每月現地水質資料測量，每測點又分為近岸點與近浪點，共六測點，測量5種水質因子，分別以空間與時間之差異進行歸納與比較，用以討論藻礁現地生長環境優劣之優劣。另以桃園市政府環境保護局提供之2017年04月至2019年03月河川水質監測數據，選定17種水質因子進行水質分析，依照同一條溪流之時間比較、鄰近溪流之空間比較，探討影響藻礁生存環境之可能因素。以新屋溪兩點測站之時間對比，以及新屋溪與鄰近溪流—觀音溪及社子溪做同一季節之空間對比，利用因子分析，將複雜的眾多因素歸類為少數的綜合因子，指出影響觀音藻礁生長之主要因子為「水中有機質」、「水質能見度」、「金屬離子導電度」、「水化反應環境」。本研究綜合海水水質與河川水質因子分析，以期對觀新藻礁保育有所貢獻。;Algal reef is widely distributed along seashorein NW Taiwan. Guanxin algal reef, the most completelydeveloped, is selected as the study area. Coral reef grew on old Shihmen gravel alluvial fan ever since 7500 years ago, and algal reef became the dominant biotic reef since about 4500 years ago. It is developed from north to south for 5km long, including Shiaufanli river, Shinwu river and Houhu river estuaries. In order to know the influence factors of water quality which affected the growing of algal reef, water samples were collected and analyzed concerning their temporal and spacial variations. Three samplingsites were 2.5km away, every sites were divided into near shore and near wave. Seawater qualities were examined every month by using a water quality analyzer, so as to evaluate the growing environment of algal reef. Furthermore, detailed water quality data were collected from Taoyuan City document, thus to find the correlation among17 parameters, along nearby Xinwu river, Guanyin river and Shetz river during the same period. It contrasted upstream and downstream at the same time on Xinwu river. Factor analysis was then performed to convert the massive and complicated elements into comprehensive factors which affected the growth of algal reef. The result of this study indicates that the major factors are "organic matter in water", "water quality visibility", "ionic quality visibility",and “hydration reaction rate”. The results are expected to be valuable in the preservation and protection of Guanxin algal reef.
