NDLI: Microelectrode Study of Oxygen Uptake and Organic Matter Decomposition in The Sediments of Xiamen Western Bay

Content Provider	Springer Nature Link
Author	Xu, Kunming Zhang, Liping Zou, Wenbin
Copyright Year	2009
Abstract	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, Mn$^{2+}$, and Fe$^{2+}$ within the sediments. The O$_{2}$ concentrations decreased sharply from about 200 μmol L$^{−1}$ in the bottom seawater to zero within a depth of a few millimeters into the sediment. Dissolved Mn$^{2+}$ was detected below the oxic zones with peak concentrations up to 600 μmol L$^{−1}$, whereas dissolved Fe$^{2+}$ had peak concentrations up to 1,000 μmol 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 Mn$^{2+}$ and Fe$^{2+}$ 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.
Starting Page	425
Ending Page	435
Page Count	11
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	32
Issue Number	3
e-ISSN	15592731
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-03-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sediment Microelectrode Oxygen Organic matter Manganese Biogeochemistry Nature Conservation Environmental Management Freshwater & Marine Ecology Earth Sciences Ecology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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