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Eutrophication and algal blooms in channel type reservoirs: A novel enclosure experiment by changing light intensity
作者姓名:Chengjin Cao  Binghui Zheng  Zhenlou Chen  Minsheng Huang  Jialei Zhang^
作者单位:School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China;Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai 200062, China;River and Coastal Environment Research Center, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China;Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai 200062, China;School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China;Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai 200062, China;School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China
基金项目:This work was supported by the Major Projects on Control and Rectification of Water Body Pollution of China (No. 2009ZX07317-006), the National Natural Science Foundation of China (No. 41001347, 40971259), the China Postdoctoral Science Foundation (No. 20100470759), the Shanghai Postdoctoral Scientific Program (No. 10R21412300), the Program of Shanghai Subject Chief Scientist (No. 10XD1401600), and the International Cooperation Program of Ministry Science and Technology Development of Sino-Germany (No. 2007DFA90510).
摘    要:To explore eutrophication and algal bloom mechanisms in channel type reservoirs, a novel enclosure experiment was conducted by changing light intensity (LI) in the Daning River of the Three Gorges Reservoir (TGR). Square enclosures (side 5.0 m) were covered on the surface with shading materials of different thickness, and with their bases open to the river. Changes and characteristics of the main eutrophication factors under the same water quality and hydrodynamic conditions but different LI were evaluated. All experimental water samples were neutral and alkalescent, with high nitrogen and phosphate concentrations, low potassium permanganate index, stable water quality, and different LI. At the same water depth, LI decreased with increasing shade material, while dissolved oxygen and water temperature were both stable. The growth peak of phytoplankton was with light of 345-4390 lux underwater or 558-7450 lux above the water surface, and water temperature of 25.6-26.5℃. Algae were observed in all water samples, accounting for 6 phylum and 57 species, with algal density changing frequently. The results showed that significantly strong or weak light was unfavorable for phytoplankton growth and the function together with suitable temperature and LI and ample sunshine encouraged algal blooms under the same water quality and hydrodynamic conditions. Correlation analysis indicated that algae reduced gradually lengthwise along water depth in the same enclosure while pH became high. The power exponent relationship between chlorophyll a (Chl-a) and LI was found by curve fitting, that is Chl-a = K(LI)n.

关 键 词:eutrophication  algal  bloom  enclosure  experiment  channel  type  reservoirs  Three  Gorges  Reservoir
收稿时间:2010/11/20 0:00:00
修稿时间:2011/2/14 0:00:00

Eutrophication and algal blooms in channel type reservoirs: A novel enclosure experiment by changing light intensity
Chengjin Cao,Binghui Zheng,Zhenlou Chen,Minsheng Huang,Jialei Zhang^.Eutrophication and algal blooms in channel type reservoirs: A novel enclosure experiment by changing light intensity[J].Journal of Environmental Sciences,2011,23(10):1660-1670.
Authors:Chengjin Cao  Binghui Zheng  Zhenlou Chen  Minsheng Huang and Jialei Zhang^
Institution:1. School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China;Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai 200062, China
2. River and Coastal Environment Research Center, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3. School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China
Abstract:To explore eutrophication and algal bloom mechanisms in channel type reservoirs,a novel enclosure experiment was conducted by changing light intensity (LI) in the Daning River of the Three Gorges Reservoir (TGR).Square enclosures (side 5.0 m) were covered on the surface with shading materials of different thickness,and with their bases open to the river.Changes and characteristics of the main eutrophication factors under the same water quality and hydrodynamic conditions but different LI were evaluated.All ...
Keywords:eutrophication  algal bloom  enclosure experiment  channel type reservoirs  Three Gorges Reservoir
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