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首页> 外文期刊>Marine ecology progress series >Phytoplankton growth allometry and sizedependent C:N stoichiometry revealed by a variable quota model
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Phytoplankton growth allometry and sizedependent C:N stoichiometry revealed by a variable quota model

机译：可变配额模型揭示了浮游植物的生长异速生长和与大小有关的C：N化学计量

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摘要

Size scaling of phytoplankton growth rates and size-dependent carbon to nitrogen (C:N) stoichiometry determine phytoplankton size structure and coupling of carbon and nitrogen cycling of marine ecosystems. They are critical in predicting the growth of phytoplankton spanning a wide range of sizes and their consequences for the biological pump in marine ecosystem models. The size scaling of phytoplankton growth and size-dependent C:N stoichiometry are modelled by embedding size-dependent light-harvesting, nutrient acquisition and storage into Droop's quota-dependent phytoplankton growth model. The size-scaling exponent of maximum growth rate of phytoplankton is -0.17 (which is higher than the universal size-scaling exponent of -1/4 predicted by the metabolic theory of ecology) under saturated light and NO_3. The size-scaling exponent of growth rate (μ) decreases with increasing light under saturated NO_3, and decreases with decreasing NO_3 concentration under saturated light. The allometry of equilibrium cellular C and N quota varies with light and NO_3 concentrations. Under saturated light and NO_3 concentration, C:N increases slightly with cell size. Under limiting light, but saturated NO_3, C:N is close to the Redfield ratio and is not size dependent. Under limiting NO_3 but saturated light, C:N is higher than the Redfield ratio and increases with cell size. We identified the uncertainty of the size-scaling exponent of μ associated with key parameters, for which more data need to be collected in the lab and field.
机译：浮游植物生长速率的大小定标以及与大小有关的碳氮比（C：N）化学计量关系决定了海洋生态系统中浮游植物的大小结构以及碳氮循环的耦合。它们对于预测范围广泛的浮游植物的生长及其对海洋生态系统模型中生物泵的后果至关重要。浮游植物生长的尺度和规模依赖的C：N化学计量是通过将尺寸依赖的采光，养分获取和储存嵌入Droop的定额依赖的浮游植物增长模型中来建模的。在饱和光和NO_3条件下，浮游植物最大生长速率的尺度比例指数为-0.17（高于生态代谢理论预测的普遍尺度尺度-1/4）。生长速率（μ）的大小比例指数在饱和NO_3下随光的增加而减小，在饱和光下随NO_3浓度的减小而减小。平衡细胞碳和氮定额的异构关系随光和NO_3浓度而变化。在饱和光和NO_3浓度下，C：N随晶胞尺寸的增加而略有增加。在极限光下，但在饱和的NO_3下，C：N接近Redfield比，并且与尺寸无关。在限制NO_3但饱和光下，C：N高于Redfield比率，并随像元大小而增加。我们确定了与关键参数相关的μ的大小比例指数的不确定性，为此需要在实验室和现场收集更多的数据。

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  • 来源
    《Marine ecology progress series》 |2011年第28期|p.29-43|共15页
  • 作者

    Zhi-Ping Mei; Zoe V.Finkel; Andrew J.Irwin;

  • 作者单位

    Department of Math & Computer Science, Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada,Present address: University of Maryland Center for Environmental Science, Horn Point Laboratory,PO Box 775, Cambridge, Maryland 21613, USA;

    Environmental Science Program, Mount Allison University, Sackville, New Brunswick E4L 1A5, Canada;

    Department of Math & Computer Science, Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    phytoplankton growth; size scaling; community structure; c:n; transport network; quota;

    机译：浮游植物的生长;尺寸缩放;社区结构;c：n;运输网络;配额;

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