| Summary: | 碩士 === 弘光科技大學 === 環境工程研究所 === 102 === In this study, 21 major reservoirs in Taiwan were investigated, including water quality parameters (transparency (SD), water temperature (WT), pH value , dissolved oxygen (DO), chlorophyll a (Chl-a), total phosphorus (TP), total organic carbon (TOC) and total nitrogen (TN)), eutrophic index (Carlson Trophic State Index, CTSI), and multiple regression analysis, whereby the province to identify the main causes of eutrophication of reservoirs. The results showed that low transparency southern reservoirs , high water temperature, low dissolved oxygen , chlorophyll a higher nutrient ( phosphorus , carbon, nitrogen ) were the highest , resulting in the highest value of CTSI Reservoir in southern province , also cause eutrophication of reservoirs in southern main reason.
According to the study of methods to control eutrophication that found to reduce phosphorus discharged into the reservoir is the best control strategy, this method would be reduced the reproduction rate of algae , to avoid the deterioration of water quality. Moreover, the situation in Southern Taiwan reservoirs, some reservoirs in nearly a decade of statistics showing a slowing trend in Lantan reservoir and reservoir Agongdian more significant, mainly because of the nutrient phosphorus, carbon and nitrogen are reduced year by year due to , and by the transparency (SD) data discovery reservoir gradually becomes clear, and chlorophyll a (Chl-a) significantly dropped significantly, which is to reduce the concentration of algae. Emerald another reservoir in northern CTSI value increased in recent years, the phenomenon has a tendency, judged mainly due to an increase in water and nutrient phosphorus trend. The results of this study may suggest eutrophication province have advised against the tendency of the reservoir of nutrients into the conduct of the watershed control, including the planting of crops should be counseling their correct fertilization or fallow, especially for the small amount of phosphorus control, must also there are elaborate plans to avoid drinking water suffer algal blooms, and even lead to safety concerns public water algae poison.
Keywords: reservoir, eutrophication, Carlson trophic state index, algae, chlorophyll a, nutrients
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