浒苔对NO_3-N和PO_4-P吸收动力学特征  

The kinetics of PO_4-P and NO_3-N uptake by Ulva prolifera

作　　者：王阳阳[1,2] 霍元子[1,2] 田千桃[1] 何培民[1,2] 

机构地区：[1]上海海洋大学水产与生命学院,上海201306 [2]上海海洋大学海洋科学研究院,上海201306

出　　处：《上海海洋大学学报》2011年第1期121-125,共5页Journal of Shanghai Ocean University

基　　金：国家自然科学基金(30371101);国家海洋局绿潮灾害专项(LC03-01);海洋赤潮灾害监测重点实验室开放课题(MATHAB200907;MATHAB200912);上海市水生生物学重点学科资助项目(S30701);上海高校选拔培养优秀青年教师科研专项基金(ssc08002)

摘　　要：研究了浒苔(Ulva prolifera)对NO3-N和PO4-P吸收动力学特征。结果表明:(1)浒苔藻体密度与NO3-N和PO4-P的去除率成正比;(2)浒苔对氮、磷的吸收速率与介质中氮、磷含量可用Mihcaelsi-Menton方程来描述(R2>0.95);(3)浒苔对NO3-N和PO4-P吸收速率与时间均呈幂函数关系(R2>0.96),并存在3个不同的生理阶段:在60 min内呈快速吸收阶段,最大吸收速率分别达到了250.43和5.82μmol/(g.h),而在60～320 min内吸收速率变化相对缓慢,最大吸收速率为155.12和2.36μmol/(g.h),在320～720 min内吸收速率基本接近平衡,此时浒苔对NO3-N和PO4-P的最大吸收速率为36.72和1.32μmol/(g.h)。该研究结果为探究浒苔爆发机制及其海洋生态效应评估提供了理论依据。This paper mainly studied the uptake kinetics of NO3-N and PO4-P by Ulva prolifera in laboratory.The results showed that：（1） The higher the density of algae,the higher removal efficiency on the NO3-N and PO4-P in Ulva prolifera is.When the algae density is 10g/L,the concentration of PO4-P in the culture medium are 94.27 percent lower than the starting time after 6 h;（2） The absorption rates of U.prolifera on nitrogen and phosphorus can be described by the Mihcaelsi-Menton equation（R2 0.95）;The absorption rates of U.prolifera on nitrogen and phosphorus had a relationship with their contents in the medium.With increasing of NO3-N and PO4-P concentrations in the medium,the absorption rates are at higher levels and eventually leveling off balance.When the concentrations of PO4-P rise to 20 μmol/L,or NO3-N rise to 45 μmol/L in the medium,the uptake rates both reached the maximum.（3） With the extension of time,there were three different stages for U.prolifera uptaking NO3-N and PO4-P： the first 60 min,called rapid uptake stage,within the the maximum uptake rate of 250.43 and 5.82 μmol/（g·h）,respectively,while in the subsequent 60-320 min the changes of uptake rates are relatively slow,and with the maximum absorption rate of 155.12 and 2.36 μmol/（g·h）,respectively.After 320-720 min,the uptake rates are close to flat,the maximum absorption rates of U.prolifera are 36.72 and 1.32 μmol/（g·h）,respectively.This study provided a theoretical basis for exploring the mechanism of U.prolifera outbreak and its marine ecological effects assessment.

关 键 词：浒苔 氮磷吸收动力学 爆发机制 

分 类 号：X503.225[环境科学与工程—环境工程] X55