| 摘要: |
| 在国内首次研究了大型海洋绿潮藻浒苔(Ulva prolifera)对NH+4-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NH+4-N与NO-3-N浓度升高, 藻体对NH+4-N的吸收速率逐渐升高, 而对NO-3-N吸收受到抑制; 当NO-3-N和NH+4-N高浓度比存在时, 藻体对NH+4-N的吸收速率随着NO-3-N/ NH+4-N比例的升高和NH+4-N浓度的下降而降低; 当NO-3-N和NH+4-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NO-3-N的吸收效率随着NO-3-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NO-3-N的能力, 只有当NH+4-N或NO-3-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NO-3-N的吸收速率, 因此, 控制NH+4-N的大量输入仍是预防浒苔绿潮爆发的关键。 |
| 关键词: 浒苔(Ulva prolifera) NH+4-N NO-3-N 绿潮 |
| DOI： |
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| 基金项目: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) |
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| The interaction between NH+4-N and ?NO-3-N in nitrogen uptaking by Ulva prolifera |
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TIAN Qian-tao,HUO Yuan-zi,WANG Yang-yang,NI Xiao-bo,HE Pei-min
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| Abstract: |
| 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. |
| Key words: Ulva prolifera NH+4-N NO-3-N green tide |
