本研究在曾文及南化兩水庫上游流域選擇10處樣區，調查期間自2006年5月至2007年3月，每個月調查一次底棲巨型絲狀藻的生物量及豐富度分佈情形。兩流域的絲狀藻以水綿屬及剛毛藻屬為優勢。一年之中，除了5月底至9月初雨季期間，皆有絲狀藻生長的情形，但兩藻屬主要生長季節具有明顯的差異，同時藻類在流域的空間分佈則隨環境條件而變。根據無母數檢定的結果，水綿屬對硬度及鹼度具有明顯的需求，同時水綿屬的生長同時受到水流及水深的影響，當硬度大於200 mg/L (as CaCO3)，鹼度大於170 mg/L (as CaCO3)，流速平均介於0.12~0.17 m/s及水深介於9~15 cm時，水綿豐富度可達70%以上；當硬度及鹼度低於150 mg/L且流速大於0.21 m/s，水綿屬的生長將受到抑制。剛毛藻屬的部份，在本研究的環境條件範圍下，僅平均日累積光量與流速對剛毛藻的生長產生顯著的貢獻，當流速介於0.18~0.37 m/s，剛毛藻有最佳的豐富等級，硬度及鹼度為對剛毛藻生長有趨勢的因子，水深及氮磷濃度在本研究中則對剛毛藻的生長不具顯著差異。

This research is to investigate the distribution of benthic macroalgae in head waters of Tseng-Wen Reservoir and Nan-Hua Reservoir. Biomass and abundance of macroalage were investigated per month in five sites selected from head water of each reservoir during May 2006 to March 2007. Spirogyra sp. and Cladophora sp. were rarely found in rainy season, May to September, whereas they grew abundantly in other months. Also, their spatial distribution was heterogeneous because of the difference among environmental factors. Spirogyra required higher concentrations of hardness and alkalinity, and lower water velocity than Cladophora.
The abundance of Spirogyra were more than 70% in the hardness concentration greater than 200 mg/L (as CaCO3) or alkalinity concentration less than 170 mg/L (as CaCO3). Spirogyra. grew not well in the concentrations of hardness and alkalinity both less than 150 mg/L. The abundance of Spirogyra was also affected by water velocity and depth, its suitable velocity is in the range of 0.12 and 0.17 m/s, and suitable water depth is in the range of 9 and 14 cm.
The light irradiation and water velocity were two main environment factors that affected the abundance of Cladophora; hardness and alkalinity were tendencious factors; and water depth, nitrogen and phosphorous were not significant factors.

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