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《Ecology and Environmental Sciences》 2009-01
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Effects of different nutritional condition on the growth and antioxidant enzyme activity of three submerged macrophytes

Liu Yan1,2, Wang Shengrui2, Jin Xiangcan2, Zou Hong1, Wang Ligang3 1. Department of Chemistry, Capital Normal University, Beijing 100048,China; 2. State Environmental Protection Key Laboratory for Lake Pollution Con-trol//Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beiing 100081,China  
The effects of different nutritional condition on the growth and antioxidant enzyme activity of submerged macrophytes Myriophyllum spicatum L, Hydrilla verticillata L and Ceratophyllum demersum L. were investigated in this study. The results showed that during the 45 days experimental time the fresh weigh of Myriophyllum spicatum L, Hydrilla verticillata L and Cerato-phyllum demersum L were 0.92 g, 0.27 g, 1.11 g and 0.56 g,0.41 g, 0.87 g in medium nutritional condition ( TN 1.86 mg·L-1;TP 0.087 mg·L-1 ) and eutrophic condition ( TN 2.47 mg·L-1;TP0.16 mg·L-1 ), respectively. The largest single plant biomass of Myrio-phyllum spicatum L and Ceratophyllum demersum L in in middle nutritional condition were over 39% and 22% higher than those in eutrophicated condition, but that of Hydrilla verticillata L was less than 51%, which shown that Myriophyllum spicatum L and Ceratophyllum demersum L grow better than Hydrilla verticillata L in middle nutritional condition. The contents of protein and chlorophyll of Hydrilla verticillata.L is lower, but those of Myriophyllum spicatum L and Ceratophyllum demersum L raised steadily in the same condition, which indicated that those two submerged macrophytes have the stronger tolerance for nutrition than Hydrilla verticillata L. The activitys of Super Oxide Dismutase (SOD), peroxidase (POD) and Multiple Displacement Amplification (MDA) of Ceratophyllum demersum L raised rapidly in the late of experiment, and the maximum value of MDA of Ceratophyllum demersum L in the eutrophic condition was 5 time higher than that in the medium nutritional condition, implied that Ceratophyllum demersum L has been stressed in the middle nutritional condition. During the experimental conditions, the activitys of SOD, POD and MDA of Ceratophyllum demersum L changed greatly, and raised rapidly in the late of experiment, which indicated that those two submerged macrophytes got more nutrient stress than Myriophyllum spicatum L, and the nutritional stress-resistant ability of Myriophyllum spi-catum L was higher than those two submerged macrophytes in the medium nutritional condition
【Fund】: 国家自然科学基金项目(40703017);; 城郊集约化农田污染和综合防控技术集成与示范项目(2006BAD17B09)
【CateGory Index】: X173
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