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| Nutrient removal and physiological response of floating macrophytes in different pollution loading waters |
| LIU Hao-hui, QIN Hong-jie, ZHANG Zhi-yong, WANG Yan, WEN Xue-zheng, LIU Hai-qin, SONG Wei, YAN Shao-hua |
| Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China |
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Abstract In order to illustrate nutrient removal and physiological response of aquatic macrophytes under different pollution loads, water lettuce and water hyacinth were selected to study on their water purification characteristics, physiological and biochemical response to tailrace of sewage. TN, TP and TK concentrations reduced from 11.97, 1.69, 8.10mg/L to 5.23, 1.10, 4.73mg/L when the sewage run through the purification pond cultured with water lettuce and water hyacinth alternately. With nutrient concentration decreasing in sewage, leaves turn yellow, chlorophyll a content in stems and leaves of water lettuce decreased significantly, while no significant changes on chlorophyll a content of water hyacinth were found. A significant negative correlation existed between NPK concentration in sewage and nitrate reductase, Na+-K+ATPase, H+-K+ATPase in roots of macrophytes. The enzyme activity of aquatic plants may be improved to meet with their efficient nutrition absorption when nutrient concentration is low in the environment. While AKP in water lettuce roots appeared positive correlation with NPK concentration in sewage. Compared with the beginning, Na+-K+ATPase and H+-K+ATPase of water hyacinth increased by 88.92% and 103.20%, respectively.
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Received: 08 May 2017
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