Biodiversity and water quality variations in constructed wetland of Yongding River system |
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Authors: | Liu Cao Du Guisen Huang Bingbin Meng Qingyi Li Huimin Wang Zijian and Song Fu |
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Institution: | 1. Department of Biological Sciences, Pusan National University, Busan 609–735, South Korea;2. Institute of Environmental Technology & Industry, Pusan National University, Busan 609–735, South Korea;3. Department of Environmental Education, Sunchon National University, Suncheon, Jeonnam 540-742, South Korea;4. Department of Environmental Science and Engineering, Kyung-Hee University, Yongin, Gyeongii 445-701, South Korea |
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Abstract: | This research was carried on in constructed wetlands of Guan-Ting Reservoir, Beijing, China, from 2004 to 2005. The phytoplankon community was composed of 8 divisions (94 species, including genus and varieties) and the average cell density was 980.93× 104 cells per liter. The dominant divisions were Chlorophyta (36.8%), Bacillariophyta (31.0%) and Cyanophyta (23.4%). The removal rate of phytoplankton density was 72.7%. There was a positive linear correlation between phytoplankon density and total phosphorus. Here, 7 families (13 species) of aquatic vasular plants were found, which constituted emerging and submerging macrophyte communities. In the wetland system, the zooplankton community consisted of Protozoa, Rotifera, Cladocera and Copepoda (70 species). The average density was 4883 individuals per liter. Protozoan and Rotifera were the dominant groups and the removal rate of their density was 81.9%. The correlation between zooplankton and phytoplankton presented a quadratic curve. Also, the zoobenthos community contained Olisochaeta, Uniramia, Crustacea and Mollusca (15 species). The average density was 5670 individuals per m2 (62.3% was Uniramia) and the removal rate of their density was 92.4 %. The wetland system reduced CODMn, BOD5, TN, NH3-N, NO3-N, TP (total phosphor), PO4-P and SS in the water of Yong Ding River at 52.9%–99.1%. |
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Keywords: | constructed wetland phytoplankton aquatic vascular plant zooplankton and zoobenthos purification efficiency |
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