Benthic mineralization and solute exchange on a Celtic Sea sand-bank (Jones Bank)
Benthic mineralization and solute exchange on a Celtic Sea sand-bank (Jones Bank)
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凯尔特海沙洲（琼斯沙洲）的底栖矿化和溶质交换
DOI：
10.1016/j.pocean.2013.06.010
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发表时间：
2013
影响因子：
4.1
通讯作者：
Larsen M
中科院分区：
文献类型：
--
作者：
Larsen M
2008年7月，对凯尔特海沙洲进行了底栖碳矿化和溶质交换的调查。沙洲顶部的沉积物由固结砂组成，具有平流孔隙水输送的特征，采样困难，这在一定程度上影响了该地点的调查。然而，在斜坡、岸底和岸外（参考地点）的 4 个站点对完整的沉积物岩心进行了采样。该沉积物用于评估底栖成岩作用的速率和路径。沉积物总 O 2 吸收量 (TOU) 范围为 5.8 至 9.0 mmol m− 2 d− 1，沉积物总溶解无机碳释放率 (DIC) 范围为 8.60 至 13.8 mmol m− 2 d− 1。微生物反硝化和硫酸盐还原分别占底栖碳矿化总量的< 2%和 12-28%。剩余的矿化分别归因于O 2 和Fe/Mn 呼吸作用。所有监测站的无支撑 210 Pb 活动剖面均表明存在深度混合，这可能是由该地区强烈的拖网捕捞活动造成的。根据渔船卫星跟踪计算得出，每年平均有 33% 的沉积物受到拖网活动的影响。据推测，这通过不断氧化还原铁来促进高金属呼吸速率，否则还原铁会积聚在沉积物中。与平行测量的微传感器测定的NO 3 剖面相比，提取的孔隙水剖面反映了升高的NO 3 水平。我们认为这反映了小型动物的 NO 3 泄漏，并且沉积物顶部 5 厘米的细胞内 NO 3 池超过孔隙水池达 45 倍。然而，与受到微生物反硝化作用的孔隙水池相比，该细胞内池的周转速度可能非常慢。
Benthic carbon mineralization and solute exchange was investigated on a Celtic Sea sandbank during July 2008. The sediment on the top of the bank consisted of consolidated sand, characterized by advective porewater transport and was difficult to sample, this to some extent compromised the investigations at this site. However, intact sediment cores were sampled at 4 stations at the slopes, base of the bank and off the bank (reference site). This sediment was used to assess rates and pathways for benthic diagenesis. Total sediment O 2 uptake (TOU) ranged from 5.8 to 9.0 mmol m− 2 d− 1 and total sediment release rates of dissolved inorganic carbon (DIC) ranged between 8.60 and 13.8 mmol m− 2 d− 1. Microbial denitrification and sulfate reduction accounted for< 2% and 12–28% of the total benthic carbon mineralization, respectively. The remaining mineralization is ascribed to O 2 and Fe/Mn respiration, respectively. Activity profiles of unsupported 210 Pb from all stations indicated deep mixing, presumably caused by intense trawling activity in the area. Calculation based on satellite tracking of fishing vessels suggest that on average 33% of the sediment is affected by trawling activity every year. This is presumed to facilitate high metal respiration rates by continuously oxidizing reduced Fe that would otherwise accumulate in the sediment. Extracted porewater profiles reflected elevated NO 3-levels as compared to microsensor determined NO 3-profiles that were measured in parallel. We suggest that this reflects NO 3-leakage from meiofauna–and that the intracellular NO 3-pool in the top 5 cm of the sediment exceeds the porewater pool up to a factor of 45. However, this intracellular pool is presumably turned over at very slow rates, compared to the porewater pool subject to microbial denitrification.
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