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首页> 外文期刊>Marine ecology progress series >Carbon oxidation and bioirrigation in sediments along a Skagerrak-Kattegat-Belt Sea depth transect
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Carbon oxidation and bioirrigation in sediments along a Skagerrak-Kattegat-Belt Sea depth transect

机译：Skagerrak-Kattegat-Belt海深样带沿沉积物中的碳氧化和生物灌溉

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摘要

Partitioning of electron acceptors and macrofaunal bioirrigation were assessed in sediments from 4 stations along a Skagerrak-Kattegat-Belt Sea depth transect. Sediment was examined for benthic fauna composition and abundance, sediment-water fluxes (O-2, dissolved inorganic carbon [DIC], NH4+, and NO3-), anaerobic reactions (carbon oxidation [C-ox], sulfate reduction [SR], manganese reduction [MnR], iron reduction [FeR], and ammonification [N-min]), porewater profiles (O-2, DIC, SO42- and NH4+), and solid phase profiles (organic content, Fe and Mn). Deep stations had less than half the abundance of benthic fauna than shallow stations, while the Belt Sea station was azoic due to bottom-water hypoxia. Solute fluxes and anaerobic reactions showed order-of-magnitude lower rates in sediment from deep than from shallow water. In general, anaerobic C-ox in sediments along the Skagerrak-Kattegat-Belt Sea transect is dominated by SR (50%) in shallow water and decreases gradually when moving into deeper water and reaches 0 at similar to 700 m depth. FeR increases from 0 in shallow water to similar to 50% at similar to 600 m, but rapidly reaches 0 again at 700 m. MnR is close to 0 down to at least 500 m and increases to complete dominance at 700 m. The contribution of denitrification is generally below 10% at all depths. Bioirrigation-quantified as non-local exchange through diagenetic modelling-is proportional to fauna bio-mass and functional traits. The Br- tracer approach to determine bioirrigation on newly extracted sediment onboard a ship is not recommended. It is concluded that enhanced downward trans location of O-2 into anoxic sediment through bioirrigation is the major mechanism reoxidizing subsurface metals in the deep Skagerrak and Kattegat.
机译：在沿Skagerrak-Kattegat-Belt海深样线的4个站的沉积物中评估了电子受体的分配和大型动物生物灌溉。检查底泥的底栖动物组成和丰度，沉积物-水通量（O-2，溶解的无机碳[DIC]，NH4 +和NO3-），厌氧反应（碳氧化[C-ox]，硫酸盐还原[SR]，锰还原度[MnR]，铁还原度[FeR]和氨化[N-min]，孔隙水曲线（O-2，DIC，SO42-和NH4 +）和固相曲线（有机含量，Fe和Mn）。深海站的底栖动物丰度不到浅海站的一半，而由于海底缺氧，带海站是偶氮的。溶质通量和厌氧反应表明，深水沉积物的速率比浅水沉积物的数量级低。通常，沿Skagerrak-Kattegat-Belt海样带的沉积物中的厌氧C-ox以浅水区的SR（> 50％）为主，并在移入更深的水中时逐渐降低，并在接近700 m的深度时达到0。 FeR在浅水处从0增加到在600 m处接近50％，但在700 m处又迅速达到0。 MnR接近于0直至至少500 m，并在700 m处增加至完全占主导地位。在所有深度，反硝化作用通常低于10％。通过成岩模拟将生物灌溉量化为非局部交换，与动物的生物量和功能性状成正比。不建议使用Brtracer方法确定船上新提取的沉积物的生物灌溉。结论是，通过生物灌溉增加了O-2向下向缺氧沉积物中的向下转运，这是深部Skagerrak和Kattegat中地下金属再氧化的主要机理。

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