DOI: 10.1029/2018GB005908
论文题名: Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries
作者: Kessler A.J. ; Roberts K.L. ; Bissett A. ; Cook P.L.M.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 7 语种: 英语
英文关键词: ammonium compound
; biogeochemical cycle
; catchment
; denitrification
; estuarine environment
; nitrate
; organic carbon
; reduction
; sediment core
; Australia
; Victoria [Australia]
学科: denitrification
; DNRA
; estuaries
; Fe-DNRA
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160216
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Global Biogeochemical Cycles,2018-01-01,32(7)