Abstract The sediment oxygen uptake rate, vertical distributions of organic carbon content, sedimentation rate, and benthic nutrient flux were measured from May 29 to June 9, 2015, to evaluate the partitioned organic carbon and nutrient cycles in the sediment of northern part of East China Sea. The sediment oxygen uptake rate, measured by in situ and/or ex situ incubation methods were ranged from 5.81 ± 0.08 to 16.36 ± 0.08 mmol O2 m−2 d−1. The fauna mediated oxygen uptake rate were ranged from 5.80 ± 0.04 to 8.09 ± 1.52 mmol O2 m−2 d−1, showing a strong relationship with the benthic macrofauna biomass and density. The burial flux of organic carbon into sediment layer ranged from 0.26 to 2.04 mmol C m−2 d−1 (average: 0.92 ± 0.64 mmol C m−2 d−1), which comprised 0.5–4.2% (average: 1.9 ± 1.3%) of primary production. Burial efficiency ranged from 2.0 to 22.4% (average: 11.1 ± 7.0%). Low sediment oxygen uptake rate caused low effluxes of dissolved inorganic nitrogen (0.19 ± 0.03–0.73 ± 0.04 mmol N m−2 d−1), phosphate (−0.034 ± 0.004–0.016 ± 0.005 mmol P m−2 d−1), and silicate (0.30 ± 0.03–1.61 ± 0.06 mmol Si m−2 d−1), which accounted for less than 10% of the nutrients required for primary production in the water column.

中文翻译：

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东海北部大陆架沉积物低底矿化和养分通量

摘要 2015年5月29日至6月9日，通过测量沉积物吸氧率、有机碳含量垂直分布、沉降速率和底栖养分通量，评价华东北部沉积物中分区有机碳和养分循环。海。通过原位和/或异地孵化方法测量的沉积物吸氧率范围为 5.81 ± 0.08 至 16.36 ± 0.08 mmol O2 m-2 d-1。动物介导的摄氧率范围从 5.80 ± 0.04 到 8.09 ± 1.52 mmol O2 m-2 d-1，显示出与底栖大型动物生物量和密度的密切关系。有机碳进入沉积层的埋藏通量范围为 0.26 至 2.04 mmol C m-2 d-1（平均值：0.92 ± 0.64 mmol C m-2 d-1），其中包括 0.5-4.2%（平均值：1.9 ± 1.3 %) 的初级生产。埋葬效率从 2 不等。0 至 22.4%（平均：11.1 ± 7.0%）。低沉积物吸氧率导致溶解无机氮 (0.19 ± 0.03–0.73 ± 0.04 mmol N m-2 d-1)、磷酸盐 (-0.034 ± 0.004–0.016 ± 0.005 mmol P m-2 d-1) 的低流出，和硅酸盐 (0.30 ± 0.03–1.61 ± 0.06 mmol Si m-2 d-1)，其占水体初级生产所需养分的不到 10%。