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首页> 美国卫生研究院文献>Frontiers in Microbiology >Sulfate reduction controlled by organic matter availability in deep sediment cores from the saline alkaline Lake Van (Eastern Anatolia Turkey)
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Sulfate reduction controlled by organic matter availability in deep sediment cores from the saline alkaline Lake Van (Eastern Anatolia Turkey)

机译：硫酸盐的还原受盐碱地范湖（土耳其安那托利亚东部）深层沉积物岩心中有机物有效性的控制

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摘要

As part of the International Continental Drilling Program deep lake drilling project PaleoVan, we investigated sulfate reduction (SR) in deep sediment cores of the saline, alkaline (salinity 21.4‰, alkalinity 155 m mEq-1, pH 9.81) Lake Van, Turkey. The cores were retrieved in the Northern Basin (NB) and at Ahlat Ridge (AR) and reached a maximum depth of 220 m. Additionally, 65–75 cm long gravity cores were taken at both sites. SR rates (SRR) were low (≤22 nmol cm-3 day-1) compared to lakes with higher salinity and alkalinity, indicating that salinity and alkalinity are not limiting SR in Lake Van. Both sites differ significantly in rates and depth distribution of SR. In NB, SRR are up to 10 times higher than at AR. SR could be detected down to 19 mblf (meters below lake floor) at NB and down to 13 mblf at AR. Although SRR were lower at AR than at NB, organic matter (OM) concentrations were higher. In contrast, dissolved OM in the pore water at AR contained more macromolecular OM and less low molecular weight OM. We thus suggest, that OM content alone cannot be used to infer microbial activity at Lake Van but that quality of OM has an important impact as well. These differences suggest that biogeochemical processes in lacustrine sediments are reacting very sensitively to small variations in geological, physical, or chemical parameters over relatively short distances.
机译：作为国际大陆钻探计划深湖钻井项目PaleoVan的一部分，我们研究了盐，碱（盐度21.4‰，碱度155 m mEq -1 ，pH）的深层沉积物芯中的硫酸盐还原（SR） 9.81）范湖，土耳其。在北部盆地（NB）和阿赫拉特脊（AR）取回岩心，最大深度为220 m。此外，在两个地点都采集了65-75厘米长的重力岩心。与盐度和碱度较高的湖泊相比，SR率（SRR）低（≤22nmol cm -3 天 -1 ），这表明盐度和碱度并不限制SR在范湖。两个站点的SR速率和深度分布都存在显着差异。在笔记本电脑中，SRR比AR高出10倍。 NB处的SR可以降至19 mblf（湖底以下米），AR处的SR可以降至13 mblf。尽管AR的SRR低于NB，但有机物（OM）浓度较高。相反，AR的孔隙水中溶解的OM包含更多的大分子OM和较少的低分子量OM。因此，我们建议，不能单独使用OM含量来推断范湖的微生物活性，但是OM的质量也具有重要影响。这些差异表明，湖相沉积物中的生物地球化学过程对较短距离内的地质，物理或化学参数的微小变化非常敏感地反应。

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