湖泊科学2013，Vol.25Issue(2)：221-226,6.
不同水生植物对富营养化水体无机氮吸收动力学特征
Kinetics of nitrate and ammonium uptake from eutrophic waters by different hydrophytes
摘要
Abstract
Nitrate (NO3- -N) and ammonium ( NH4+ -N) are two major inorganic nitrogen forms in eutrophic water. Study on NO3- -N and NH4+ -N uptake kinetics of aquatic plants can help to find the hydrophytes that efficient removal of nitrogen in eutrophic water. The nutrient uptake kinetics of Iris louisiana, Myriophyllum verticillatum, Zizania latifolia and Oenanthe clecumbens were investigated using the concentration gradient method after plants were grown for 15 days in Hogland nutrition liquid. Results showed that NO3- -N and NH4+ -N uptake kinetics of the 4 species could be expressed by the Michaelis-Menten equation. The NO3- -N and NH4+ -N uptake rates of hydrophytes enhanced with increasing NO3- -N and NH4+ -N content; however, when the solution increased to 2.0 mmol/L, the increasing amplitude of the uptake rates would reduce. The maximum rate ( Vmn) of uptake NO3- -N and NH4+ -N by the 4 species of hydrophytes followed the order: Oenanthe clecumbens > Zizania latifolia > Iris louisiana > Myriophyllum verticillatum. The chemical affinity( Km ) of NO3- -N followed the order: Oenanthe clecumbens > Iris louisiana = Zizania latifolia = Myriophyllum verticillatum. The Km of NH4+ -N followed the order; Oenanthe clecumbens > Myriophyllum verticillatum > Iris Louisiana = Zizania latifolia. According to parameters( Vmta , Km ) of uptake kinetics, as a conclusion, Oenanthe clecumbens is suitable for purifying high NO3~ -N and NH4+ -N content waters, but Zizania latifolia, Iris louisiana and Myriophyllum verticillatum are just opposite. The four hydrophytes have showed different preferences of uptake NO3- -N and NH4+ -N form solution. The potential of uptake NO3- -N form solution by Iris louisiana was higher than that of uptake NH4+ -N, but the chemical affinity of uptake NH4+ -N was higher than that of uptake NO3 -N, this show that Iris Louisiana preferentially uptake NH4+ -N from high NO3- -N content water. Myriophyllum verticillatum and Oenanthe clecumbens are equivalent in absorbing NO3- -N and NH4+ -N. Zaania latifolia showed higher potential and chemical affinity of uptake NH4+ -N than N03- -N.关键词
水生植物/硝态氮/铵态氮/吸收动力学/富营养化水体Key words
Hydrophyte/ nitrate/ ammonium/ uptake kinetics/ eutrophic water引用本文复制引用
张贵龙,赵建宁,刘红梅,秦伟,吴钰明,杨殿林..不同水生植物对富营养化水体无机氮吸收动力学特征[J].湖泊科学,2013,25(2):221-226,6.基金项目
江苏省太湖水环境治理科研项目(TH2010203)资助. （TH2010203）
