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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Production of 15N-depleted biomass during cyanobacterial N2-fixation at high Fe concentrations
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Production of 15N-depleted biomass during cyanobacterial N2-fixation at high Fe concentrations

机译：高铁浓度下蓝细菌固氮过程中15N贫化生物量的产生

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In this study we examine the effects of varying Fe, Mo, and P concentrations on δ 15N fractionation during N2 fixation in the cyanobacterium Anabaena variabilis. We show that when grown in Fe-enriched media ([Fe] ≥ 50 nM), this organism produces biomass up to 3‰ lower in δ 15N than when grown in Fe-limited media ([Fe] < 50 nM). A compilation of our data with previous measurements of δ 15N in N2-fixing cyanobacteria reveals a general trend toward the production of more 15N-depleted biomass at higher Fe concentrations. We discuss our results in the context of negative δ 15N values preserved in Archean and some Phanerozoic sediments, generally attributed to the production of marine organic matter with low δ 15N by N2 fixation (and potentially NH4 + regeneration) during periods of fluctuating nutrient dynamics. We suggest that enhanced Fe availability during periods of widespread ocean anoxia can further stimulate the production of 15N-depleted biomass by N2-fixing organisms, contributing to the isotopic record.
机译：在这项研究中，我们研究了变化的Fe，Mo和P浓度对变异型蓝细菌Anabaena variabilis固氮过程中δ15N分离的影响。我们表明，当在富铁培养基（[Fe]≥50 nM）中生长时，该生物在δ15N中产生的生物量比在有限铁培养基中[[Fe] <50 nM）时低3‰。我们对以前固定N2的蓝细菌中δ15N的测量数据的汇编显示，在较高的Fe浓度下，生产更多的15 N耗尽的生物质的总体趋势。我们将在太古代和一些生代沉积物中保存的负δ15N值的背景下讨论我们的结果，这通常归因于养分动态变化期间通过N2固定（以及潜在的NH4 +再生）产生的δ15N低的海洋有机物。我们建议，在广泛的海洋缺氧期间提高铁的利用率可以进一步刺激固氮的生物体产生15 N耗尽的生物质，从而有助于同位素记录。

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