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Influence of the organic matter composition on benthic oxygen demand in the Rhône River prodelta (NW Mediterranean Sea)

机译:有机质组成对罗纳河地下海(NW地中海)底栖需氧量的影响

摘要

Measurements of diffusive (DOU) and total (TOU) sediment oxygen uptakes, oxygen penetration depth, porosity, OC, TN, carbohydrate, lipid, amino acid, chlorophyll a and pheophytin a concentrations were assessed in surface sediments at 9 stations located in the Rhône River prodelta and the adjacent continental shelf during April 2007 (a period characterized by low flow and discharge regimes). Our results show that sedimentary organics in the Rhône River prodelta were mainly fueled by a single source of OM, namely continental inputs. Those inputs were relatively labile and decreased following an inshore–offshore gradient. The descriptors of sedimentary organics mostly resulted from dilution and degradation processes affecting OM during its transfer from the mouth of the Rhône River. TOU/DOU ratios were close to one, with a slight increase at offshore stations. This is coherent with the limitation of bioirrigation in response to organic enrichment. DOU correlated best with bulk quantitative descriptors of sedimentary organics, which probably resulted from the overall correlation between all biochemical descriptors linked with the predominance of a single source of organic matter in the whole studied area. Nevertheless, an influence of Chl a and Pheo a contents on oxygen consumptions, possibly due to freshwater or/and marine primary production, is not to be excluded. These small fractions (0.08‰ to total OM) could then be responsible for the oxygen consumption, even if not visible in classical measurements as δ13C or C/N.
机译:在罗纳河(Rhône)9个站点的表面沉积物中评估了扩散(DOU)和总(TOU)沉积物氧吸收,氧渗透深度,孔隙率,OC,TN,碳水化合物,脂质,氨基酸,叶绿素a和脱镁叶绿素a浓度的测量值。 2007年4月(这期间流量和流量较低的时期)的河三角洲和邻近的大陆架。我们的研究结果表明,罗纳河三角洲的沉积有机物主要由单一的有机质来源(即大陆投入物)提供燃料。这些投入相对不稳定,并且随着近岸-离岸梯度的增加而减少。沉积有机物的描述主要是由于稀释和降解过程影响了OM从罗纳河河口转移过程中的影响。 TOU / DOU比率接近1,离岸站略有增加。这与响应有机富集的生物灌溉的局限性是一致的。 DOU与沉积有机物的大量定量指标最相关,这可能是由于所有生化指标之间的整体相关性与整个研究区域中单一有机物来源的优势有关。尽管如此,也不排除Chla和Pheo a含量对氧气消耗的影响,这可能是由于淡水或/和海洋初级生产引起的。即使在经典测量中以δ13C或C / N看不见,这些小部分(相对于总OM的<0.08‰)也可能是耗氧量的原因。

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