Benthic Carbon Mineralization in Hadal Trenches: Insights From In Situ Determination of Benthic Oxygen Consumption

Benthic Carbon Mineralization in Hadal Trenches: Insights From In Situ Determination of Benthic Oxygen Consumption
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深渊海沟中的底栖碳矿化:原位测定底栖耗氧量的见解

DOI:
10.1002/2017gl076232
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发表时间:
2018-03
影响因子:
5.2
通讯作者:
Duofu Chen
Duofu Chen
中科院分区:
地球科学1区
文献类型:
--
作者:
Min Luo;Ronnie N. Glud;Binbin Pan;Frank Wenzhoefer;Yunping Xu;Gang Lin;Duofu Chen

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深海海沟被认为是有机质的沉积中心和成矿热点。在这项研究中,我们第一次量化的总底栖O2吸收超深渊沟使用原位室孵育。热带太平洋的三个海沟是研究的目标,由于水深较大,它们表现出相对较高的成岩活动,即马里亚纳海沟(2.0 × 102 μmol O2 m−2 d−1,10,853 m),穆索海沟(2.7 ± 0.1 × 102 μmol O2 m−2 d−1,7,011 m)和新不列颠海沟(6.0 ± 0.1 × 102 μmol O2 m−2 d−1,8,225 m)。结合沉积物中总有机碳和总有机碳的δ 13 C分析以及前人发表的超深成环境中原位O2微剖面,我们认为超深成海底碳矿化部分受地表生产力的控制,同时也与距陆地的距离有关。因此,我们强调,陆地有机物可以在维持底栖生物群落在一些超深渊设置的重要性。
Hadal trenches have been proposed as depocenters of organic material and hot spots for organic matter mineralization. In this study, we for the first time quantified the total benthic O2 uptake in hadal trenches using in situ chamber incubations. Three trenches in the tropical Pacific were targeted and exhibited relatively high diagenetic activity given the great water depths, that is, the Mariana Trench (2.0 × 102 μmol O2 m−2 d−1, 10,853 m), the Mussau Trench (2.7 ± 0.1 × 102 μmol O2 m−2 d−1, 7,011 m), and the New Britain Trench (6.0 ± 0.1 × 102 μmol O2 m−2 d−1, 8,225 m). Combined with the analyses of total organic carbon and δ13C of total organic carbon in the sediments and previously published in situ O2 microprofiles from hadal settings, we suggest that hadal benthic carbon mineralization partly is governed by the surface production and also is linked to the distance from land. Therefore, we highlight that terrestrial organic matter can be of importance in sustaining benthic communities in some hadal settings.
DOI: 10.1016/j.marchem.2004.06.033
发表时间: 2004-12-01
期刊: MARINE CHEMISTRY
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