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首页> 外文期刊>Marine ecology progress series >Linking chlorophyll-nutrient dynamics to the Redfield N:C ratio with a model of optimal phytoplankton growth
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Linking chlorophyll-nutrient dynamics to the Redfield N:C ratio with a model of optimal phytoplankton growth

机译：用最佳浮游植物生长模型将叶绿素-营养动力学与Redfield N：C比值联系起来

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摘要

The Redfield N:C ratio is a fundamental quantity in marine biogeochemistry because it is a key determinant of the efficiency of the biological carbon pump, yet no convincing explanations have been put forward for its remarkable constancy over much of the world ocean. Phytoplankton growth models have so far been unable to account for the different relationships between growth rate and N:C ratio under nutrient and light limitation, and have not been able to predict the Redfield N:C ratio. A relatively simple model of coupled chlorophyll and nutrient dynamics is developed from the premise that phytoplankton maximize growth by optimally allocating nutrient and energy resources among competing metabolic requirements for nutrient uptake, light-harvesting, and growth. The model reconciles nutrient and light limitation and appears valid under both balanced and non-balanced growth conditions. The Redfield N:C ratio and its constancy are explained as a result of evolutionary pressure towards maximizing light-limited growth rates in relatively carbon-rich oceanic waters.
机译：Redfield N：C比值是海洋生物地球化学中的基本量，因为它是决定生物碳泵效率的关键因素，但尚未提出令人信服的解释，因为其在世界大部分海洋中具有非凡的恒定性。到目前为止，浮游植物的生长模型尚无法解释在营养和光照限制下生长速率与N：C比率之间的不同关系，也无法预测Redfield N：C比率。建立了一个相对简单的叶绿素和营养素动力学耦合模型，其前提是浮游植物通过在营养素吸收，采光和生长的竞争性代谢需求之间最佳地分配营养素和能量资源来最大化生长。该模型协调了养分和光照限制，并且在平衡和非平衡生长条件下均显示有效。 Redfield N：C比率及其恒定性是由于在相对富碳的海洋水域中最大化光限制生长速率的进化压力而产生的。

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