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首页> 外文期刊>Geophysical Research Letters >Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles
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Contribution of Electroactive Humic Substances to the Iron-Binding Ligands Released During Microbial Remineralization of Sinking Particles

机译：电活性腐殖质物质对微生物颗粒微生物再矿物质释放的铁结合配体的贡献

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摘要

Iron is a key micronutrient in seawater, but concentrations would be negligible without the presence of organic ligands. The processes influencing the ligand pool composition are poorly constrained, limiting our understanding of the controls on dissolved iron distributions. To address this, the release of iron and iron-binding ligands during the microbial remineralization of sinking particles was investigated by deploying in situ particle interceptor/incubator devices at subsurface sites in the Mediterranean Sea and Subantarctic. Analyses revealed that the pool of released ligands was largely dominated by electroactive humic substances (74 +/- 28%). The release of ligands during remineralization ensured that concurrently released iron remained in solution, which is crucial for iron regeneration. This study presents compelling evidence of the key role of humic ligands in the subsurface replenishment of dissolved iron and thus on the wider oceanic dissolved iron inventory, which ultimately controls the magnitude of iron resupplied to the euphotic zone.
机译：铁是海水中的关键微量营养素，但没有有机配体的存在，浓度会忽略不计。影响配体池组合物的过程受到严重的约束，限制了我们对溶解铁分布对照的理解。为了解决这一点，通过在地下地点的地下地点在地下地点和小脑区的地下部位部署原位粒子拦截/培养箱装置，研究了在微生物再矿物的微生物再矿化期间释放铁和铁结合配体。分析显示，释放配体的池在很大程度上由电活性腐殖质（74 +/- 28％）主导。结核期间配体的释放确保了释放的铁仍然存在于溶液中，这对于铁再生至关重要。本研究提出了令人兴奋的证据表明腐殖配体在溶解铁的地下补充中的关键作用，从而掌握了更广泛的海洋溶解铁库存，这最终控制了对Euphotic区的铁的大小。

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