| DOI: | 10.1111/gcb.12923
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| 论文题名: | Nitrous oxide fluxes in estuarine environments: Response to global change |
| 作者: | Murray R.H.; Erler D.V.; Eyre B.D.
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| 刊名: | Global Change Biology
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| ISSN: | 13541013
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| 出版年: | 2015
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| 卷: | 21, 期:9 | | 起始页码: | 3219
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| 结束页码: | 3245
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| 语种: | 英语
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| 英文关键词: | Denitrification
; Estuary
; Greenhouse gas
; Intertidal
; Mangrove
; Mudflat
; Nitrous oxide
; Salt marsh
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| Scopus关键词: | denitrification
; estuarine environment
; global change
; greenhouse gas
; intertidal environment
; mangrove
; mudflat
; nitrogen oxides
; nitrous oxide
; saltmarsh
; Rhizophoraceae
; nitrous oxide
; Alismatales
; denitrification
; estuary
; metabolism
; nitrification
; wetland
; Alismatidae
; Denitrification
; Estuaries
; Nitrification
; Nitrous Oxide
; Wetlands
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| 英文摘要: | Nitrous oxide is a powerful, long-lived greenhouse gas, but we know little about the role of estuarine areas in the global N2O budget. This review summarizes 56 studies of N2O fluxes and associated biogeochemical controlling factors in estuarine open waters, salt marshes, mangroves, and intertidal sediments. The majority of in situ N2O production occurs as a result of sediment denitrification, although the water column contributes N2O through nitrification in suspended particles. The most important factors controlling N2O fluxes seem to be dissolved inorganic nitrogen (DIN) and oxygen availability, which in turn are affected by tidal cycles, groundwater inputs, and macrophyte density. The heterogeneity of coastal environments leads to a high variability in observations, but on average estuarine open water, intertidal and vegetated environments are sites of a small positive N2O flux to the atmosphere (range 0.15-0.91; median 0.31; Tg N2O-N yr-1). Global changes in macrophyte distribution and anthropogenic nitrogen loading are expected to increase N2O emissions from estuaries. We estimate that a doubling of current median NO3- concentrations would increase the global estuary water-air N2O flux by about 0.45 Tg N2O-N yr-1 or about 190%. A loss of 50% of mangrove habitat, being converted to unvegetated intertidal area, would result in a net decrease in N2O emissions of 0.002 Tg N2O-N yr-1. In contrast, conversion of 50% of salt marsh to unvegetated area would result in a net increase of 0.001 Tg N2O-N yr-1. Decreased oxygen concentrations may inhibit production of N2O by nitrification; however, sediment denitrification and the associated ratio of N2O:N2 is expected to increase. © 2015 John Wiley & Sons Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/61899
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| Appears in Collections: | 影响、适应和脆弱性
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作者单位: | Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW, Australia
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| Recommended Citation: | |
Murray R.H.,Erler D.V.,Eyre B.D.. Nitrous oxide fluxes in estuarine environments: Response to global change[J]. Global Change Biology,2015-01-01,21(9)
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