Phytoplanktonic biomass synthesis: application to deviations from Redfield stoichiometry
Phytoplanktonic biomass synthesis: application to deviations from Redfield stoichiometry
复制标题
浮游植物生物量合成：应用于雷德菲尔德化学计量偏差
DOI：
10.3989/scimar.2001.65s2153
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发表时间：
2001
期刊：
影响因子：
1.4
通讯作者：
F. Fraga
中科院分区：
文献类型：
--
作者：
F. Fraga
总结：在浮游植物光合作用形成生物量的过程中，二氧化碳和营养物质NO 3和PO 4被消耗，而氧气则以固定的比例产生，称为雷德菲尔德比率。Broecker示踪剂，即，NO = O2 + RN·NO3，PO = O2 + RP·PO4，CO = O2 + RC·CO2，在光合作用过程中保持不变，因为消耗的养分被O2的形成所抵消。当一种或几种营养素耗尽时，雷德菲尔德比率不再成立，示踪剂不再保持恒定。其主要原因是过量碳水化合物或脂质的形成，N2固定，或植物生长素种群产生的CaCO3板，这些种群已经开发出不同的策略来获得它们所需的营养。本文提出了新的示踪剂，保持不变，无论是否满足Redfield化学计量。新示踪剂的值和常规示踪剂的值之间的差异揭示了生物量生产中存在的异常。它们还允许对任何此类异常进行全球和按深度地层的量化，并单独评估每一个异常，即使同时发生一个以上的异常。
SUMMARY: During biomass formation as a result of phytoplankton photosynthesis, CO 2 and the nutrients NO 3 and PO 4 are consumed and O2 produced in fixed proportions known as the Redfield ratio. Broecker’s tracers, i.e., “NO” = O 2 +R N ·NO 3 , “PO” =O 2 +R P ·PO 4 , and “CO” = O 2 +R C ·CO 2 , remain constant during photosynthesis, because nutrients consumed are offset by O2 formation. When one or several nutrients become depleted, the Redfield ratio no longer holds, and the tracers cease to remain constant. The main causes are formation of excess carbohydrates or lipids, N 2 fixation, or production of CaCO3 plates by phytoplanktonic populations that have developed different strategies for obtaining the nutrients they need. This paper presents new tracers that remain constant, irrespective of whether or not Redfield stoichiometry is satisfied. Differences between the values of the new tracers and the values of the conventional tracers reveal the presence of anomalies in biomass production. They also allow quantification of any such anomalies, both globally and by depth stratum, and assessment of each individual anomaly separately, even when more than one anomaly occur simultaneously.