吳先琪臺灣大學:環境工程學研究所陳琬菁Chen, Wan-ChingWan-ChingChen2010-05-102018-06-282010-05-102018-06-282009U0001-2807200917004800http://ntur.lib.ntu.edu.tw//handle/246246/181618台灣水庫的水質問題以優養化影響層面最大。優養產生藻華現象所造成問題甚多，新山水庫在每年4月中旬至下旬時，發現藍綠藻華的形成，並且發現銅綠微囊藻（Microcystis aeruginosa）為藻華發生時之優勢種。於以往的藻類資料採集，在應用上皆視為採樣當日平均值，並無法得知藻類一天在水體中移動之情形。24小時監測分析結果可知，水體之溫度、溶氧及酸鹼值，一天之中的差異性不大，因此在考慮微囊藻消長變化這些基本的水質參數日變化可視為定值。當微囊藻在水體下層可利用的光線較弱時，微囊藻細胞密度變小，浮力變大，因此微囊藻上浮至表水並且待白天光線變強時行光合作用，但是行光合作用產生了密度較重的碳水化合物，使得微囊藻細胞密度變重，而微囊藻失去浮力，緩慢的向下沉降。研究藉由水庫24小時藻類資料採集，觀測微囊藻在水體中一日內實際位置移動之情形，實驗結果顯示不同時間採樣，微囊藻於光線較弱時，上浮至表水，待白天光線變強時，緩慢的向下沉降。Eutrophication in reservoirs is of great concern in terms of water quality management nowadays. Eutrophication in reservoirs often comes with algal blooms, and causes water quality deteriorating. In reservoirs for drinking water supply, cyanobacteria can be a nuisance because of taste and odor problem. In addition, some cyanobacteria may be harmful to human and aquatic lives. One of the examples is Microcystis sp., which produces toxin, for example, the microcystin. he aim of this research was to investigate the factors that cause the dominance of Microcystis sp. in reservoirs. A notable feature of bloom-forming Microcystis sp. is the presence of gas vesicles in the cell, which combined with the carbohydrate content in the cells, regulates the vertical movement of algae in density-stratified water bodies. The density change of algal cell has been reported to be the result of two simultaneous processes: (i) a light-dependent increase in density due to photosynthesis; (ii) a time-dependent decrease related to respiration and the history of irradiation intensity. A significant correlation between the received light dose and the buoyancy loss was found.n order to understand the relationship among environmental factors and the cell buoyancy, samples were taken at different depths in the reservoir for 24 hours. The dynamic changes of the distribution of Microcystis sp. population, physical and chemical parameters were monitored. Models were established and simulations were performed to provide better understanding of the mechanisms responsible for the complex movement of Microcystis sp. resulted from the change in buoyancy and the mixing of the water column in the reservoir.目 錄文摘要 I文摘要 II錄 IV目錄 VII目錄 VIII一章 前言 1-1 研究動機 1-2 研究目的 3二章 文獻回顧 4-1 藍綠藻之基本介紹 4-2 微囊藻之生長特性 4-3 微囊藻的浮力調控 5-4 藻類生長因子 6-4-1 物理因子 6-4-1-1 光線日照強度 7-4-1-2 溫度 8-4-1-3 水體分層 8-4-1-4 光化層深度與混合層深度之比值 9-4-2 化學因子 10-5 藻類在水庫中之宿命 11-6 藻類動態模擬相關文獻 12三章 研究方法 14-1 研究水域簡介 14-1-1 水質採樣 15-1-1-1 季節性週期採樣 15-1-1-2 24小時密集採樣 16-1-2 檢測分析方法 18-2 建立微囊藻消長動態模式 19-2-1 微囊藻之移動 20-2-1-1 藻密度變化之模式 20-2-1-2 藻位移追踪模式 21四章 結果與討論 24-1 背景及二十四小時連續監測 24-1-1 背景水質監測結果 24-1-2 二十四小時連續水質監測結果 25-1-3 營養鹽濃度分布分析結果 28-1-4 微囊藻濃度分析結果 32-2 模式模擬與校正 36五章 結論與建議 38-1 結論 38-2 建議 39六章 參考文獻 40application/pdf1105475 bytesapplication/pdfen-US優養化微囊藻細胞密度浮力垂直移動24小時eutrophicationcyanobacteriaMicrocystis sp.,vertical movementcell buoyancyphysical parameterschemical parameters[SDGs]SDG6[SDGs]SDG14thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/181618/1/ntu-98-R95541101-1.pdf