摘要:由于莫愁湖與秦淮河的地下通道被阻斷了，湖水失去了自凈能力，使得莫愁湖的水質嚴重惡化。此外，莫愁湖已經有25年沒有清淤，這也同時影響了水質。本課題采取莫愁湖的水樣用于培養斜生柵藻，并且通過對照實驗（主要是在水樣中加入氮、磷）來觀察藻類的長勢。由實驗結果可知，在TN與TP之比小于7時，氮是藻類生長的限制因素。相同的實驗條件下，高濃度氮比低濃度氮更有利于藻類生長，高濃度磷比低濃度磷更有利于藻類生長。通過對藻類生長狀況的連續觀測，我們還發現，隨著天數的增長，藻類呈連續增長趨勢，達到一個最大生長量之后，藻數目開始下降。通過本研究發現，整治莫愁湖的水質除了需要做好清淤與水質更換工作外，更要有效地防止氮、磷等營養元素的流入，這樣才能使莫愁湖的水質維持在一定的生態安全范圍之內。

關鍵詞：莫愁湖，富營養化，生態安全，AGP實驗

Abstract:As the underground tunnel of MoChou Lake with QinHuai River is blocked,the lake lost its selfpurification ability and the water quality has been seriously deteriorated.In addition, the MoChou Lake has not been liminated bottom mud for 25 years,which is another reason for the deterioration of the water quality.In this study,the water of MoChou Lake was used to train the Scenedesmus obliquus.To observe the growth of Scenedesmus obliquus trained,another control experiment was carried out. Experimental results ,showed,when the ratio of TN and TP concentration was less than 7,nitrogen was the limiting factor for the growth of the Scenedesmus obliquus.Under the same conditions,higher nitrogen concentration of was more benefit than low nitrogen concentration .By observing the algal growth,the algae grew continuously day by day and when it reached its maximum growth,the number of algae began to decrease.Results of this study showed that,to protect the MoChou Lake,some methods such as cleaning and replacing the water,controlling the nutrients inflow,especially the nitrogen and phosphorus and so on should be carried out in the future.

Keyword: MoChou Lake; Eutrophication; Ecological security; AGP

　我國是一個多湖泊國家，天然湖泊遍布全國，大于1km2的湖泊共2300多個，湖泊面積為70988km 2，約占全國陸地總面積的0.8% ，但湖泊的匯水范圍及其對流域社會與經濟發展所產生的影響遠遠高于上述比例。湖泊是陸地水資源的重要組成部分，儲水總量為7088億m3，其中淡水儲量為2250億 m3，是地下水可開采量的2.2倍，也是我國飲用水的重要來源，全國城鎮飲用水水源的50%以上源于湖泊。湖泊作為一種與人類生存和發展密切相關的獨特資源，在供水、防洪、航運、旅游及維系區域生態平衡方面發揮著巨大作用，是我國各民族人民賴以生存的重要資源。全國糧食產量的近1/3 ~1/4來自于湖泊流域，工農業總產值占全國的30%以上。