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cje ›› 2009, Vol. 28 ›› Issue (12): 2561-2566.

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Endurance of Elodea nuttallii to high concentration of nitrogen and phosphorus.

WANG Xiao-dong1,2;QIN Bo-qiang1;GAO Guang1;YANG Gui-jun1,2|WANG Hong-yan3;SONG Yu-zhi1,2,3|FENG Sheng1,2   

  1. 1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography &|Limnology, Chinese Academy of Sciences, Nanjing 210008, China|2Graduate University of Chinese Academy of Sciences, Beijing 100039, China|3Nanjing University of Information Science &|Technology, Nanjing 210044, China
  • Online:2009-12-10 Published:2009-12-10

Abstract: In a growth experiment, five relatively constant gradients of total nitrogen (TN) and phosphorous (TP) concentrations were installed to study the endurance of Elodea nuttallii to high concentrations of nitrogen and phosphorus. The pH value, DO, planktonic chlorophyll a, and periphytic chlorophyll a in the culture solutions as well as the height, wet and dry weights, and chlorophyll a concentration of E. nuttallii were compared among the treatments. Elodea uttallii could endure the stress of TN=10 mg·L-1and TP=0.4 mg·L-1, and no abundant phytoplankton occurred under this stress. However, under the stress of TN=50 mg·L-1and TP=2 mg·L-1and of TN=100 mg·L-1and TP=4 mg·L-1, E. nuttallii growth was obviously limited, and plankton increased but periphyton decreased markedly, which suggested that the high concentration TN and TP in water body could have direct damage to E. nuttallii, and the shading caused by phytoplankton multiplication could partly limited the growth of E. nuttallii. As for Taihu Lake, in which, the average concentrations of TN and TP were lower than 10 mg·L-1and 04 mg·L-1, respectively, the decline of submerged aquatic macrophytes could not be caused by the direct harm and stress of nitrogen and phosphorus.

Key words: Rice, Free-air CO2 enrichment, Appearance quality of rice grain, Milling quality of rice grain, Cooking quality of rice grain, Protein content of rice grain