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Phosphorus and nitrogen limitation of phytoplankton growth in eutrophic Lake Inba, Japan

机译：日本富营养化印巴湖浮游植物生长的磷和氮限制

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摘要

Lake Inba is one of the most eutrophic lakes in Japan. In this study, field sampling and nutrient enrichment bioassays were conducted to determine the seasonal patterns of nutrient limitation for phytoplankton growth in this lake. Phytoplankton biomass increased significantly with the additions of phosphorus (P) on almost all sampling dates, indicating P limitation of phytoplankton growth from spring to autumn. However, nitrogen (N) limitation was also observed during summer (i.e., 19 August). On 10 August, a typhoon struck Lake Inba. After this event, dissolved inorganic nitrogen (DIN) and phosphorus concentrations increased, probably because of increased river discharge. At the same time, phytoplankton growth in the control treatment became relatively high, with the addition of neither P nor N stimulating the growth. However, 10 days after the typhoon, the phytoplankton growth rate in the control treatment decreased, with only the addition of N having a significant positive effect on phytoplankton growth. N limitation during summer is caused by the low concentrations of DIN, as well as changes in the N:P ratio due to allochthonous nutrient loads. These results indicate that a reduction of both P and N input is necessary to control phytoplankton blooms in Lake Inba.
机译：印ba湖是日本最富营养的湖泊之一。在这项研究中，进行了野外采样和养分富集生物测定，以确定该湖中浮游植物生长的养分限制的季节性模式。在几乎所有采样日期，浮游植物的生物量都随着磷的添加而显着增加，这表明从春季到秋季，浮游植物的磷含量受到限制。但是，在夏季（即8月19日）也观察到了氮（N）的限制。 8月10日，一场台风袭击了印巴湖。此事件之后，溶解的无机氮（DIN）和磷的浓度增加了，这可能是由于河流流量增加所致。同时，在对照处理中浮游植物的生长变得相对较高，既不添加P也不添加N刺激生长。但是，在台风发生10天后，对照处理中的浮游植物生长速率下降，仅添加N对浮游植物的生长具有明显的积极影响。夏季N的限制是由于DIN的浓度低以及由于异源养分负荷引起的N：P比值的变化。这些结果表明，减少磷和氮的输入量对于控制印巴湖浮游植物开花是必要的。

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  • 来源
    《Limnology》 |2013年第1期|51-58|共8页
  • 作者

    Maiko Kagami; Yutaka Hirose; Hisako Ogura;

  • 作者单位

    Department of Environmental Science Faculty of Science Toho University">(1);

    Department of Environmental Science Faculty of Science Toho University">(1);

    Chiba Prefectural Environmental Research Center">(2);

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Lake Inba; Typhoon; Bioassay; Diatom; Cyanobacteria;

    机译：印巴湖;台风;生物测定硅藻;蓝细菌;

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