气候变化领域集成服务门户(CCPortal): Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries

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DOI	10.1029/2018GB005908
	Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries
	Kessler A.J.; Roberts K.L.; Bissett A.; Cook P.L.M.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1045
结束页码	1057
卷号	32 期号:7
英文摘要	The balance between estuarine denitrification and dissimilatory nitrate reduction to ammonium (DNRA) is critical for determining nitrogen loads received by oceans from inland waters. We aimed to determine the factors controlling the ratio between these processes and determining whether nitrogen was generally removed or recycled in estuaries. Rates of denitrification and DNRA with depth were measured in intact sediment cores in 11 estuaries along the coast of Victoria, Australia. The estuaries studied represent a range of biogeochemical conditions, land use, and catchment size. At a pore water profile scale, the ratio of denitrification to DNRA was well predicted by a multiple regression model with nitrate concentration in the overlying water, dissolved pore water iron, and ammonium as the predictor variables. Areal denitrification rates varied from 4 to 150 μmol · m−2 · hr−1, and DNRA rates varied from 2 to 30 μmol · m−2 · hr−1, with the ratio of denitrification to DNRA spanning a range from denitrification-dominated (denitrification/DNRA = 8.4) to DNRA-dominated (denitrification/DNRA = 0.3). DNRA dominated at sites with high iron pools and high organic carbon to nitrate ratios. We conclude that low nitrate and high Fe2+ availability generally enhances DNRA and drives an estuary toward being N recycling, rather than N removing. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	denitrification; DNRA; estuaries; Fe-DNRA
语种	英语
scopus关键词	ammonium compound; biogeochemical cycle; catchment; denitrification; estuarine environment; nitrate; organic carbon; reduction; sediment core; Australia; Victoria [Australia]
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129812
作者单位	Water Studies Centre, School of Chemistry, Monash University, Clayton, VIC, Australia; Now at School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Kessler A.J.,Roberts K.L.,Bissett A.,et al. Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries[J],2018,32(7).
APA	Kessler A.J.,Roberts K.L.,Bissett A.,&Cook P.L.M..(2018).Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries.Global Biogeochemical Cycles,32(7).
MLA	Kessler A.J.,et al."Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries".Global Biogeochemical Cycles 32.7(2018).