Research On Ecological Amplitude Of Nutrition Restrictive Factors In The Changjiang And Jialing Rivers Interjunction In Chongqing

The Three Gorges Projects attracts worldwide attention, is a cross-centennial super-huge water control project, will play a great role in flood control, generate electricity, shipping, irrigation and regulating climate and so on, mean great to influence of economic construction of our country. At the same time, as the influenced by storage of the Three Gorges Dam, and in course of integrated control water pollution in the Three Gorges Reservoir Area (TGRA), we need understanding and grasping badly whether eutrophication will take place in Changjiang and Jialing River in Chongqing, and how to water quality change. The eutrophication of water body is a complicated ecology course, in the research on condition and mechanism of taking place in eutrophication, in order to further understand relation between nutrition restrictive factors and eutrophication, the task used the principle of ecological amplitude to deep research the nutrition restrictive factors in Changjiang and Jialing River interjunction in Chongqing. Meanwhile, the task still utilized Shuanglong Lake to simulate the situation after future complete storage of the TGRA, analyzed, studied the restrictive factors ecological amplitude of static and dynamic water body, the results had some meanings to understand the condition and mechanism of taking place in eutrophication of two flow states. This research has got the following conclusions:(1) the single nitrogen is not an obvious stimulus to growth of algae, while phosphorus acts as the restrictive factor. The experimental results provide us with important parameters to understand the conditions of eutrophication and to analyse its mechanism.(2) the restrictive factor of the dynamic water (Changjiang and Jialing River interjunction) is phosphorus , the ecological amplitude of phosphorus is unimodality for testing algae, and showed characteristic three base points, its tolerance range is the concentrate of phosphorus 0.005～100 mg/L, the lowest the concentrate of phosphorus is 0.005 for the testing algae, the fittest is 0.150 mg/L, the highest is 100 mg/L, the specific value of nitrogen and phosphorus is also unimodality for testing alga; the prosphorus is also the restrictive factor of static water (Shuang long Lake), the ecological amplitude of phosphorus is also unimodality for the specific growth rate of testing algae, and showed characteristic three base points, the tolerance range is the concentrate of phosphorus 0.005～100 mg/L, the lowest the concentrate of phosphorus...