DOI: 10.1007/s10533-013-9947-9
Scopus记录号: 2-s2.0-84900807956
论文题名: Effects of floating vegetation on denitrification, nitrogen retention, and greenhouse gas production in wetland microcosms
作者: Jacobs A.E. ; Harrison J.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 51
结束页码: 66
语种: 英语
英文关键词: Denitrification
; Floating vegetation
; Greenhouse gas production
; Microcosm
; Nitrogen retention
; Wetland
Scopus关键词: constructed wetland
; denitrification
; gas exchange
; greenhouse gas
; hot spot
; microcosm
; nitrogen cycle
; wetland
英文摘要: Wetlands are biogeochemical hotspots that have been identified as important sites for both nitrogen (N) removal from surface waters and greenhouse gas (GHG) production. Floating vegetation (FV) commonly occurs in natural and constructed wetlands, but the effects of such vegetation on denitrification, N retention, and GHG production are unknown. To address this knowledge gap, we used microcosm experiments to examine how FV affects N and GHG dynamics. Denitrification and N retention rates were significantly higher in microcosms with FV (302 μmol N m-2 h-1 and 203 μmol N m-2 h-1, respectively) than in those without (63 μmol N m-2 h-1 and 170 μmol N m-2 h-1, respectively). GHG production rates were not significantly different between the two treatments. Denitrification rates were likely elevated due to decreased dissolved oxygen (DO) in microcosms with FV. The balance of photosynthesis and respiration was more important in affecting DO concentrations than decreased surface gas exchange. The denitrification fraction (N2-N production: N retention) was higher in microcosms with FV (100 %) than those without (33 %) under increased (tripled) N loading. A 5 °C temperature increase resulted in significantly lower denitrification rates in the absence of FV and significantly lowered N2O production with FV, but did not significantly change CH4 production or N retention in either treatment. These results suggest that intentional introduction of FV in constructed wetlands could enhance N removal while leaving GHG production unchanged, an insight that should be further tested via in situ experiments. © 2014 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83598
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: School of the Environment, Washington State University Vancouver, Vancouver, WA, 98686, United States
Recommended Citation:
Jacobs A.E.,Harrison J.A.. Effects of floating vegetation on denitrification, nitrogen retention, and greenhouse gas production in wetland microcosms[J]. Biogeochemistry,2014-01-01,119(2018-01-03)