雅浦海沟沉积有机碳垂向分布及其指示意义

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Abstract

Sediment core from the Yap Trench located in the west Pacific Ocean was collected by manned deep-sea research submersible Jiaolong. Geochemical parameter analyses (e.g. total organic carbon (TOC), δ¹³C, grain size composition and specific surface area (SSA)), combined with an end-member mixing model, a degradation model and principal component analysis (PCA) were conducted in order to 1) study the vertical distribution of the organic carbon (OC) and corresponding affecting factors, 2) assess the degradation and accumulation rate and the flux of the sedimentary OC in the Yap Trench. The mean TOC content of the Yap Trench was (0.31%±0.10%) and was comparable with those of the neritic sediments. Probably due to enrichment of the allochthonous organic matter in the large grain-sized particles (e.g. silt) and intense decomposition of OC by microorganisms, the TOC content was positively related with silt% and negatively related with SSA and clay%. The microorganism-derived OC was the dominant proportion of the sedimentary TOC (52%±21%), followed by the marine (37%±19%) and terrestrial (11%±4%) OC. The OC contents of those three sources all decreased downward. Based on PCA, decoupling between the microorganism-derived and the allochthonous OC indicated that the OC delivered by the submarine groundwater was probably an important nutritional supply for the microorganisms in the trench. The degradation rate of the refractory OC which dominated the vertical profile of TOC was around 0.0012a^-1, slightly higher than that of the normal deep ocean but lower than the neritic environment. The accumulation rate and settling flux of TOC in the Yap Trench were around 1.8×10^-5gC/(cm²·a) and 2.2×10⁹gC/a.

Key words： Yap Trench sedimentary organic carbon vertical distribution source degradation

Received: 07 February 2018

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	WU Bin
	LI Dong
	ZHAO Jun
	LIU Cheng-gang
	SUN Cheng-jun
	CHEN Jian-fang
	PAN Jian-ming
	HAN Zheng-Bing
	HU Ji

Cite this article:

WU Bin,LI Dong,ZHAO Jun等. Vertical distribution of sedimentary organic carbon in the Yap Trench and its implications[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3502-3511.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3502

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