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《Chinese Journal of Ecology》 2008-03
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Effects of TN:TP ratio in eutrophic water on the growth of Vallisneria spiralis

WEN Ming-zhang,ZHENG You-fei,WU Rong-jun(College of Environmental Science and Engineering,Nanjing University of Science Information & Technology,Nanjing 210044,China)  
In an outdoor controllable experiment,the effects of different TN:TP ratios(12.5:1,25:1,and 50:1) in eutrophic water on the growth of Vallisneria spiralis were investigated.When the TN:TP ratio was 25:1,V.spiralis had the best growth,with a biomass increment being 54% and 31% higher than that when the TN:TP ratio was 12.5:1 and 50:1,respectively,while the growth of periphyton,especially of epiphytic algae,was the worst,giving the least adverse effects on V.spiralis,indicating that a 25:1 of TN:TP ratio in eutrophic water was optimal for the growth of V.spiralis.However,such an optimal TN:TP ratio only worked when the nutrients concentration in eutrophic water was below the limited level,otherwise,it could be failed to be applicable.
【Fund】: 国家科技部“863”项目(2002AA601011);; 中国科学院知识创新战略行动资助项目(KZCXI-SW-12)
【CateGory Index】: X52
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