On nitrogen fixation and preferential remineralization of phosphorus

On nitrogen fixation and preferential remineralization of phosphorus
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磷的固氮和优先再矿化

DOI:
10.1029/2012gl050897
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发表时间:
2012
影响因子:
5.2
通讯作者:
Monteiro F
Monteiro F
中科院分区:
地球科学1区
文献类型:
--
作者:
Monteiro F

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区域和全球固氮率通常根据与 N* (= NO3−− 16PO43−) 相关的地球化学示踪剂来估计。然而,这种示踪剂的模式反映了许多过程的影响,包括固氮、反硝化、有机物再矿化、可变化学计量、大气沉积和物理运输。在这里,我们使用理想化模型来说明有机磷的优先再矿化如何解释观察到的北大西洋 N* 分布特征,包括地下最大值和中温跃层时间变化的增加。如果磷的优先再矿化是影响氮*海洋分布的关键,那么已发表的固氮估计可能会低估海洋固氮速率多达三倍。
Regional and global nitrogen fixation rates are often estimated from geochemical tracers related to N* (= NO3−− 16PO43−). However the patterns of this tracer reflect the influence of numerous processes including nitrogen fixation, denitrification, remineralization of organic matter, variable stoichiometry, atmospheric deposition and physical transport. Here we have used idealized models to illustrate how preferential remineralization of organic phosphorous may explain observed features of N* distribution in the North Atlantic Ocean, including a subsurface maximum and an increased temporal variability in the mid‐thermocline. If preferential remineralization of phosphorus is key in shaping the oceanic distribution of N*, published estimates of nitrogen fixation may be underestimating the marine nitrogen fixation rate by as much as a factor of three.
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