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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Mapping electron sources and sinks in a marine biogeobattery
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Mapping electron sources and sinks in a marine biogeobattery

机译：绘制海洋生物地球电池中的电子源和吸收器的图

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摘要

Filamentous, multicellular bacteria of the Desulfobulbaceae family form a biogeobattery in marine sediments by mediating an electric coupling between sulfide oxidation in deeper anoxic layers and oxygen reduction at the sediment surface. The electric fields generated in such biogeobatteries were determined with microelectrodes and correlated well with geochemical indicators of microbial electrogenic activity in the top 2 cm of the sediment. The electric fields collapsed within less than a minute when oxygen was removed and reestablished when oxygen was reintroduced, demonstrating a direct coupling between aerobic microbial activity and presence of electric fields. Modeling of the electric potential distribution was used to quantify and localize electron sources and sinks. Most anodic oxidation was confined to the lower part of the anoxic zone with nondetectable free sulfide, suggesting that iron sulfide was the main sulfide source and had already been depleted in the upper part of the anoxic zone. The flow of electrons from anoxic sediment layers fuelled up to 80% of the aerobic activity of the sediment. Responses of the electric field to the presence and absence of nitrate, nitrite, or nitrous oxide in the overlying water readily demonstrated potentials for cathodic reduction of nitrite or nitric oxide and possibly nitrate but not nitrous oxide.
机译：脱硫鳞茎科的丝状多细胞细菌通过介导深层缺氧层中的硫化物氧化与沉积物表面的氧还原之间的电耦合，在海洋沉积物中形成生物地理电池。用微电极测定在这些生物地球电池中产生的电场，并与沉积物顶部2 cm的微生物电活动的地球化学指标很好地相关。去除氧气后不到一分钟的时间内电场就崩溃了，重新引入氧气后电场又恢复了，这表明有氧微生物活性与电场的存在直接耦合。电势分布的建模用于量化和定位电子源和吸收器。大部分的阳极氧化被限制在缺氧区域的下部，且未检测到游离硫化物，这表明硫化铁是主要的硫化物来源，并且已经在缺氧区域的上部被耗尽。来自缺氧沉积物层的电子流为沉积物的有氧活性提供了高达80％的能量。电场对上覆水中硝酸盐，亚硝酸盐或一氧化二氮的存在和不存在的响应很容易地证明了亚硝酸盐或一氧化氮以及可能的硝酸盐而不是一氧化二氮的阴极还原潜力。

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