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	Microelectrode Study of Oxygen Uptake and Organic Matter Decomposition in The Sediments of Xiamen Western Bay
	Xu, Kunming ; Xu KM(许昆明) ; Zhang, Liping ; Zou, Wenbin
	2009-05
关键词	Sediment Microelectrode Oxygen Organic matter Manganese Biogeochemistry
英文摘要	Sediment cores were sampled from Xiamen Western Bay at five sites during the summer and winter of 2006 and Hg-Au microelectrodes were used to make on board measurements of the concentration gradients of dissolved oxygen, Mn2+, and Fe2+ within the sediments. The O-2 concentrations decreased sharply from about 200 mu mol L-1 in the bottom seawater to zero within a depth of a few millimeters into the sediment. Dissolved Mn2+ was detected below the oxic zones with peak concentrations up to 600 mu mol L-1, whereas dissolved Fe2+ had peak concentrations up to 1,000 mu mol L-1 in deeper layers. The elemental contents of organic carbon and nitrogen within the sediments were analyzed and their C/N ratios were in the range of 9.0 to 10.1, indicative of heavy terrestrial origin. Sediments from two sites near municipal wastewater discharge outlets had higher organic contents than those from the other sites. These high organic contents corresponded to shallow O-2 penetration depths, high dissolved Mn2+ and Fe2+ concentrations, and negative redox potentials within the sediments. This indicated that the high organic matter content had promoted microbial respiration within the sediments. Overall, the organic content did not show any appreciable decrease with increasing sediment depths, so a quadratic polynomial function was used to fit the curve of O-2 profiles within the sediments. Based on the O-2 profiles, O-2 fluxes across the seawater and sediment interface were estimated to be in the range 6.07 to 14.9 mmol m(-2) day(-1), and organic carbon consumption rates within the surface sediments were estimated to be in the range 3.3 to 20.8 mgC cm(-3) a(-1). The case demonstrated that biogeochemistry within the sediments of the bay was very sensitive to human activities such as sewage discharge.; Natural Science Foundation of China [40476035]
语种	英语
出版者	SPRINGER
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1007/s12237-009-9153-0]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Xu, Kunming,Xu KM,Zhang, Liping,et al. Microelectrode Study of Oxygen Uptake and Organic Matter Decomposition in The Sediments of Xiamen Western Bay[J],2009.
APA	Xu, Kunming,许昆明,Zhang, Liping,&Zou, Wenbin.(2009).Microelectrode Study of Oxygen Uptake and Organic Matter Decomposition in The Sediments of Xiamen Western Bay..
MLA	Xu, Kunming,et al."Microelectrode Study of Oxygen Uptake and Organic Matter Decomposition in The Sediments of Xiamen Western Bay".(2009).

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