不同品种浮萍磷素吸收动力学特征  

Phosphorus Uptake Kinetics of Different Types of Duckweed

作　　者：蔡树美[1] 刘文桃[2] 张震[3] 柏彦超[3] 钱晓晴[3] 

机构地区：[1]扬州大学生物科学与技术学院,江苏扬州225126 [2]扬州环境资源职业技术学院环境科学与工程系,江苏扬州225126 [3]扬州大学环境科学与工程学院,江苏扬州225126

出　　处：《生态与农村环境学报》2011年第2期48-52,共5页Journal of Ecology and Rural Environment

基　　金：江苏省社会发展计划(BS2007040);江苏省科技支撑计划(农业)(BE2009378)

摘　　要：以长江三角洲地区常见的3种浮萍——稀脉浮萍(Lemna aequinoctialis)、少根紫萍(Spirodela oligorrhiza)和紫萍(Spriodela polyrrhiza)为对象,研究不同品种浮萍对HPO42-的吸收动力学影响。结果表明,3种浮萍对无机磷的吸收动力学特征基本可采用Michaelis-Menten方程描述3,种浮萍无机磷吸收速率V对磷浓度S双倒数曲线的拟合关系均在α=0.01水平上显著。稀脉浮萍对无机磷的亲和力较强,适宜应用于对低磷浓度污水的净化;紫萍对无机磷的最大吸收速率Vmax较高,适宜应用于对高磷浓度污水的净化。An increasing attention has been paid to the use of duckweed in treating eutrophicated water as a tool of bio-remediation of domestic wastewater.Phosphorus uptake kinetics was studied,of different species of duckweeds,i.e.Lemna aequinoctialis,Spirodela oligorrhiza and Spriodela polyrrhiza,which are common in the Yangtze River Delta area.Results show that the phosphorus uptake kinetics of the duckweeds could be expressed with the Michaelis-Menten equation;and the relation between phosphorus uptake rate（V） of the duckweeds and inorganic phosphorus（Pi） concentration（S）,was well fitted with a double-reciprocal curve with α=0.01;the Km value for Pi uptake of Lemna aequinoctialis was lower than that of Spirodela oligorrhiza and Spriodela polyrrhiza,making it a better candidate for treating wastewater low in Pi concentration.The maximum phosphorus uptake rate of Spriodela polyrrhiza was higher than that of the other two species,which allows Spriodela polyrrhiza better performance in purifying wastewater higher in Pi concentration.

关 键 词：浮萍 磷污水 HPO42- 吸收动力学 

分 类 号：X52[环境科学与工程—环境工程]