| Summary: | 碩士 === 國立臺灣海洋大學 === 海洋環境資訊學系 === 99 === This study utilizes the multivariate statistical method and Carlson Trophic state index to analyze the water quality of Shihmen reservoir between 2007 to 2010, affected eutrophication of reservoirs and the factors of conductivity, pH, dissolved oxygen, total phosphorus, biochemical oxygen demand, chemical oxygen demand, suspended solids, ammonia nitrogen, nitrate nitrogen and chlorophyll a. After analysis, the results showed increased levels of conductivity, total phosphorus, nitrate nitrogen, suspended solids and ammonia nitrogen in reservoir water quality, suggesting that maybe due to typhoon or rainfall. The concentration of chemical oxygen demand and biochemical oxygen demand were higher in 2007 January in reservoir water quality. It due to the typhoon Shanshan on 2006 September, but reducing by degrees to showed stabilized. The nitrogen and phosphorus ratio of water quality from Shihmen reservoir, found of nitrogen was the limiting factors for algal growth. After statistical analysis, the results in spring showed increased levels of nutrients in reservoir, suggesting that maybe caused by rain washing in upstream. Large number of algae growth in summer caused by temperature. In autumn, the levels of water turbidity and nutrients were higher. It may be caused by typhoon. Less influence in winter , that water quality is better than spring, summer and autumn. After principal components analysis, that affected the main factors of Shihmen reservoir were seasonal factors, nutrient factors and organic factors.
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