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Benthic fluxes on the Oregon shelf

机译：俄勒冈架子上的底栖通量

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Benthic chamber incubations were performed in the mid-shelf region on the Oregon shelf in June and August 2009 to measure fluxes of oxygen, nutrients, and iron and their effect on water column chemistry. Chamber oxygen and nitrate fluxes were into the sediments while silicate, iron and ammonium fluxes were out of the sediments. Benthic fluxes were similar between the two months, except that dissolved iron fluxes were higher at some sites in August. Bottom waters were consistently hypoxic (43-64 mu M O-2) and had ammonium concentrations from 0 to 2.6 mu M in the mid-shelf region. Given measured ammonium fluxes (0.2-1.4 mmol m(-2) d(-1)), we used a simple stoichiometric model for a 10 m bottom boundary layer to calculate that benthic fluxes only contributed similar to 16-41% of the bottom water ammonia. Benthic oxygen fluxes (-4.3 to -12.5 mmol O-2 m(-2) d(-1)) were responsible for similar to 38-51% of oxygen drawdown in the benthic boundary layer. In both cases, the remainder may be attributed to water column respiration. Benthic iron and nitrate fluxes have opposite effects on productivity. Iron fluxes (0 -71 mu mol m(-2) d(-1), average: 5 mu mol m(-2) d(-1)) increased bottom water concentrations while nitrate was lost (-1.2 to -2.9 mmol m(-2) d(-1) NO3-) due to denitrification. By supplying iron and consuming nitrogen, benthic diagenetic processes reinforce an iron-replete, nitrate-limited coastal ecosystem. (c) 2015 Elsevier Ltd. All rights reserved.
机译：在2009年6月和2009年8月在俄勒冈架子上的货架中部区域进行了底栖培养箱培养，以测量氧气，养分和铁的通量及其对水柱化学的影响。箱内的氧气和硝酸盐通量进入沉积物中，而硅酸盐，铁和铵的通量则脱离沉积物。两个月底底通量相似，只是8月份某些地点的溶解铁通量更高。底水始终缺氧（43-64μM O-2），并且在中层架区域的铵浓度为0至2.6μM。给定测得的铵通量（0.2-1.4 mmol m（-2）d（-1）），我们对10 m底部边界层使用了简单的化学计量模型，以计算底流通量仅贡献底部的16-41％氨水。底栖氧气通量（-4.3至-12.5 mmol O-2 m（-2）d（-1））导致与底栖边界层中的氧气降落量相似，为38-51％。在这两种情况下，其余部分可能归因于水柱呼吸。底铁和硝酸盐的通量对生产率有相反的影响。铁通量（0 -71μmol m（-2）d（-1），平均：5μmol m（-2）d（-1））增加了底水浓度，而硝酸盐损失了（-1.2至-2.9 mmol m（-2）d（-1）NO3-）由于反硝化作用。通过供应铁和消耗氮，底栖成岩作用增强了铁含量丰富，硝酸盐限制的沿海生态系统。 （c）2015 Elsevier Ltd.保留所有权利。

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