浒苔对NH_4^+-N与NO_3^--N吸收的相互作用  

The interaction between NH_4^+-N and NO_3^--N in nitrogen uptaking by Ulva prolifera

作　　者：田千桃[1] 霍元子[1] 王阳阳[1] 倪晓波[1] 何培民[1] 

机构地区：[1]上海海洋大学水产与生命学院,上海201306

出　　处：《海洋科学》2010年第7期41-45,共5页Marine Sciences

基　　金：国家自然科学基金项目(2007AA09Z406);上海市浦江人才计划项目(05PJ14086);上海市优秀学科带头人计划项目(08XD14037);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项目(ssc08002)

摘　　要：在国内首次研究了大型海洋绿潮藻浒苔(Ulva prolifera)对NH4+-N与NO 3--N两种氮源的选择吸收作用。结果表明:当两种氮源等浓度比例存在时,随着NH4+-N与NO3--N浓度升高,藻体对NH4+-N的吸收速率逐渐升高,而对NO3--N吸收受到抑制;当NO3--N和NH 4+-N高浓度比存在时,藻体对NH4-N的吸收速率随着NO3--N/NH4+-N比例的升高和NH4-N浓度的下降而降低;当NO3--N和NH4+-N低浓度比存在时,藻体对NH+4-N保持较高的吸收速率,而对NO3--N的吸收效率随着NO3--N浓度的降低而降低;浒苔具有同时利用水体中较高浓度的NH+4-N和NO3--N的能力,只有当NH4+-N或NO3--N浓度较低时,才以吸收相对应的氮源为主。这说明浒苔能够快速、大量地吸收水体中氮源,为爆发性增殖贮备物质条件。同时,即便两种氮源同时存在,浒苔对NH+4-N的吸收速率也远高于对NO3--N的吸收速率,因此,控制NH4+-N的大量输入仍是预防浒苔绿潮爆发的关键。The nitrogen uptake by Ulva prolifera in the forms of NH＋4-N and NO-3-N was investigated. With increasing concentrations of the total nitrogen （NH＋4-N/NO-3-N= 1）, the absorption rate of NH＋4-N was increased, but the absorption rate of NO-3-N？ was inhibited. With the ratio of NO-3-N / ＋ NH＋4-N 〉 1, the absorption rate of NH＋4-N decreased with the increase of the ratio of NO-3-N/NH＋4-N. With the ratio of NH＋4-N/ NO-3-N 〉 1, the absorption rate of NH＋4-N was significantly higher than that of NO-3-N by U. prolifera. NH＋4-N and NO-3-N can both be absorbed by U. prolifera; the species with higher concentrations will be the main N resource. Therefore U. prolifera can quickly uptake the nitrogen in water for blooning. Moreover the absorption rate of NH＋4-N of U. prolifera.was significantly higher than that of NO-3-N in the presence of NH＋4-N and NO-3-N. Hence, to prevent the Green Tide blooming, it is key to control the importing of NH＋4-N.

关 键 词：浒苔(Ulva prolifera) NH+4-N NO-3-N 绿潮 

分 类 号：Q178.1[生物学—水生生物学]