DOI: 10.1007/s10533-013-9908-3
Scopus记录号: 2-s2.0-84896373751
论文题名: Nitrogen-oxide emissions from tropical forest soils exposed to elevated nitrogen input strongly interact with rainfall quantity and seasonality
作者: Corre M.D. ; Sueta J.P. ; Veldkamp E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 103
结束页码: 120
语种: 英语
英文关键词: Denitrification
; Long-term ecosystem-scale experiment
; Nitric oxide
; Nitrification
; Nitrous oxide
; Soil nitrogen cycling
Scopus关键词: concentration (composition)
; denitrification
; forest soil
; montane forest
; nitric oxide
; nitrous oxide
; rainfall
; seasonality
; soil emission
; soil nitrogen
; soil profile
; tropical forest
; Panama [Central America]
英文摘要: In tropical forests, multi-year studies on the impact of chronic nitrogen (N) enrichment on soil N-oxide fluxes are lacking. Our objectives were to: (1) assess the changes in soil N-oxide (NO+N2O) fluxes from a montane forest in response to 3-4 years of N addition and compare these to the response of a lowland forest with 11-12 years of N addition, (2) quantify the contributions of nitrification and denitrification to nitrous oxide (N2O) emissions, and (3) assess how deep in the soil profile the N2O concentrations are affected by N input. These measurements were conducted in montane and lowland forests in Panama in 2008-2009, which covered the last 2 years of a 4-year investigation that started in 2006. Each forest had a control and N addition treatment (125 kg urea N ha-1 year-1) with four replicate plots (1,600 m2 each) per treatment. N-oxide emissions from the montane forest started to increase within the first 2 years of treatment and continued to increase in the 3rd and 4th years of N addition, during which the emissions were already equivalent to those from the lowland forest with 11-12 years of N addition. The large N-oxide response of the montane forest to N addition were due to the large increases in gross nitrification rates in the organic layer and the high moisture contents of the mineral soil due to the high rainfall (5.5 ± 0.2 m year-1). In the lowland forest (2.7 ± 0.1 m rain year-1), N-oxide response to N addition was more pronounced in wet years (i.e. 2006-2007 with 5-17 % higher rainfall than average) than in dry years (i.e. 2008-2009 with 5-26 % lower rainfall than average). Denitrification was the dominant source of N2O not only for the organic layer and the top 5 cm of mineral soil but possibly also for the entire 2 m depth. Soil-air N2O concentrations were elevated by N addition down to at least 2 m. Our results suggest that the best indicators of these responses were the presence of an organic layer and rainfall quantity and seasonality. © 2013 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/83645
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: Soil Science of Tropical and Subtropical Ecosystems, Buesgen Institute, Georg-August University of Goettingen, Buesgenweg 2, 37077 Göttingen, Germany
Recommended Citation:
Corre M.D.,Sueta J.P.,Veldkamp E.. Nitrogen-oxide emissions from tropical forest soils exposed to elevated nitrogen input strongly interact with rainfall quantity and seasonality[J]. Biogeochemistry,2014-01-01,118(2018-01-03)