Acclimation by diverse phytoplankton species determines oceanic carbon to nitrogen ratios
Acclimation by diverse phytoplankton species determines oceanic carbon to nitrogen ratios
复制标题
不同浮游植物物种的适应决定了海洋碳氮比
DOI：
10.1002/lol2.10304
复制
发表时间：
2023
影响因子：
7.8
通讯作者：
Aita Maki Noguchi
中科院分区：
文献类型：
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作者：
Masuda Yoshio;Yamanaka Yasuhiro;Smith Sherwood Lan;Hirata Takafumi;Nakano Hideyuki;Oka Akira;Sumata Hiroshi;Aita Maki Noguchi
浮游植物的碳氮比（CN）连接着海洋中的碳和氮循环。在气候变化的情况下，这一比例的任何变化都会改变光合作用固定的碳量，并最终改变海洋中的固碳量。然而，对于观测到的浮游植物氯化萘比率的物种特异性变化，仍然缺乏一致的机制解释。我们表明，适应周围环境条件解释了浮游植物CN比率的变化，将浮游植物适应理论的基础上，碳与氮的获取能力之间的资源分配权衡到一个三维的海洋生态系统模型。CN比率及其敏感性的种间差异是由Droop最小氮细胞配额的种间差异引起的。我们的模型，所观察到的浮游植物参数的约束下，表明全球平均浮游植物CN比大于典型的Redfield比，建议以前的区域原位观测的基础上。
The carbon to nitrogen (CN) ratio of phytoplankton connects the carbon and nitrogen cycles in the ocean. Any variation in this ratio under climate change will alter the amount of carbon fixed by photosynthesis, and ultimately the amount sequestered in the ocean. However, a consistent mechanistic explanation remains lacking for observed species‐specific variations in phytoplankton CN ratios. We show that acclimation to ambient environmental conditions explains the observed variation of phytoplankton CN ratios by incorporating phytoplankton acclimation theory based on a resource allocation trade‐off between carbon vs. nitrogen acquisition capacity into a three‐dimensional marine ecosystem model. Inter‐specific differences in CN ratio and its sensitivity are caused by inter‐specific differences in Droop's minimum nitrogen cell quota. Our model, constrained by observed phytoplankton parameters, shows that the global mean phytoplankton CN ratio is greater than the canonical Redfield ratio, as suggested previously based on regional in situ observations.