乳山湾邻近海域有机碳的分布与底界面过程

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Abstract

Estuaries, lagoons and bays are considered as the most important ocean margins due to their important influence in land-sea interaction under human activities, playing key roles in the regional carbon biogeochemical cycles. Based on measurements obtained from comprehensive survey in the adjacent area of Rushan Bay in summer of 2009 and 2014, organic carbon (OC) distributions, its benthic processes and influence factors were determined. The results showed that the concentration of dissolved organic carbon (DOC) in summer 2009 ranges from 0.70 to 3.19mg/L, with an average concentration of 1.80mg/L. Concentration of DOC was high in August, and low in June. Time-dependent variation of DOC and particulate organic carbon (POC) were ranged in1.79~15.2mg/L and 0.04~1.33mg/L, respectively. DOC patterns were mainly affected by human activities, primary production and tide. Estimated POC sedimentation rate was (25±0.8) g/m²in summer, accounting for 66% of the carbon fixation by phytoplankton related to primary production. DOC concentrations in the pore water of the upper sediment (0~4cm) were 8~9 times larger than those in the overlying water, and benthic DOC flux at the sediment-water interface ranged from 14.4 to 97g/(m²a), accounting for 1.1%~13.4% of DOC in the water DOC pool. Anthropogenic activities were the key factors that influence the OC distribution and cycling in the coastal areas of Rushan Bay. The OC budget shows that regeneration of sedimentary TOC contributes to a large share of diffusive DOC flux, indicating that the sediment is a significant source of DOC to water column in the study area. More than 50% of OC can be transported by tides and currents. The net burial of OC in sediments represents 13% of the carbon pool that yield by the primary production in summer. Low-oxygen level may enhance benthic diffusive of DOC and other diagenetic processes, which would play a key role in controlling OC conservation in the sediment.

Key words： Rushan Bay organic carbon flux primary production benthic process

Received: 20 July 2016

PACS:	X55
	P72

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	Articles by authors
	ZANG Jia-ye
	ZHAO Chen-ying
	LIU Jun
	XIE Lin-ping
	WANG Yi-bin
	ZHANG Ai-jun
	RAN Xiang-bin

Cite this article:

ZANG Jia-ye,ZHAO Chen-ying,LIU Jun等. Characteristics and benthic processes of organic carbon in the adjacent area of Rushan Bay[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 1089-1102.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I3/1089

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