The distribution and growth factors of Spirogyra sp. and Cladophora sp. in upstream in South Taiwan

• Main Authors: Yu-Ting Shih, 施郁庭
• Other Authors: Ching-Gung Wen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/93814805456941139740

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 95 === 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.