人为重悬浮对沉积物有机质的影响：实验方法

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science Pub Date : 2024-10-11 DOI:10.1016/j.ecss.2024.108981

Christian Lønborg , Stiig Markager , Simon David Herzog , Catia Carreira , Signe Høgslund

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引用次数: 0

摘要

全球沿海沉积物经常受到各种物理人为过程（如底拖网捕捞）的扰动，导致沉积物有机物（OM）重新悬浮到上覆水体中。在这项研究中，我们的实验结果表明，人为的沉积物再悬浮会使再悬浮到水体中的沉积物中的有机碳（14 倍）和氮（3 倍）含量降低，而对有机磷则没有发现可测量的反应。我们的研究结果还表明，有机物的生物利用率降低，碳：氮：磷的化学计量发生了变化，这表明人为的再悬浮改变了有机物池的化学组成和/或生成和降解途径。检测到的 OM 生物地球化学变化可能会影响沿岸水域的营养物质释放、氧气消耗，同时增加二氧化碳的产生。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach

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Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach

Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings furthermore show that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen consumption and at the same time increase CO₂ production in coastal waters.

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来源期刊

Estuarine Coastal and Shelf Science 地学-海洋学

CiteScore

5.60

自引率

7.10%

发文量

374

审稿时长

9 months

期刊介绍： Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.