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首页> 外文期刊>Environmental Science & Technology >Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter
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Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter

机译：在Euphotic沉积物中引发闪亮的光芒：营养富集刺激储存有机物的出口

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摘要

Estuarine sediments are important sites for the interception, processing, and retention of organic matter, prior to its export to the coastal oceans. Stimulated microbial co-metabolism (priming) potentially increases export of refractory organic matter through increased production of hydrolytic enzymes. Using the microphytobenthos community to directly introduce a pulse of labile carbon into sediment, we traced a priming effect and assessed the decomposition and export of preexisting organic matter. We show enhanced efflux of preexisting carbon from intertidal sediments enriched with water column nutrients. Nutrient enrichment increased production of labile microphytobenthos carbon, which stimulated degradation of previously unavailable organic matter and led to increased liberation of "old" (6855 ± 120 years BP) refractory carbon as dissolved organic carbon (DOC). These enhanced DOC effluxes occurred at a scale that decreases estimates for global organic carbon burial in coastal systems and should be considered as an impact of eutrophication on estuarine carbon budgets.
机译：在出口到沿海海洋之前，河口沉积物是截取，加工和保留有机物质的重要网站。受刺激的微生物共代谢（灌注）通过增加水解酶的产生可能增加难治性有机物的出口。使用磁体细胞症群体直接引入沉积物的不稳定碳脉冲，我们追踪了引发效果并评估了预先存在的有机物质的分解和出口。我们展示了来自富含水柱营养素的跨空间沉积物的预先存在的碳的增强的渗透。营养富集增加了不稳定的微细胞碳的产生，其刺激了预先不可用的有机物质的降解，并导致了增加“旧”（6855±120岁BP）耐火炭碳（DOC）的难以碳的解放。这些增强的DOC流出发生在沿海系统中全球有机碳埋葬的估计的规模，并且应该被视为富营养化对雌卤碳预算的影响。

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  • 来源
    《Environmental Science & Technology》 |2020年第18期|11165-11172|共8页
  • 作者

    Philip M. Riekenberg; Joanne M. Oakes; Bradley D. Eyre;

  • 作者单位

    Department of Marine Microbiology and Biogeochemistry NIOZ Royal Netherlands Institute jor Sea Research and Utrecht University Den Hoorn 1790AB The Netherlands Centre for Coastal Biogeochemistry School of Environment Science and Engineering Southern Cross University Lismore NSW 2480 Australia;

    Centre for Coastal Biogeochemistry School of Environment Science and Engineering Southern Cross University Lismore NSW 2480 Australia;

    Centre for Coastal Biogeochemistry School of Environment Science and Engineering Southern Cross;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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