DOI: 10.1002/2012GB004471
Scopus记录号: 2-s2.0-84888807288
论文题名: The nitrogen cycle of tropical montane forest in Ecuador turns inorganic under environmental change
作者: Wilcke W ; , Leimer S ; , Peters T ; , Emck P ; , Rollenbeck R ; , Trachte K ; , Valarezo C ; , Bendix J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1194
结束页码: 1204
语种: 英语
英文关键词: climate change
; dissolved organic nitrogen
; ecosystem solutions
; nitrogen deposition
; nitrogen turnover
Scopus关键词: Dissolved organic nitrogen
; Environmental change
; Nitrogen deposition
; Nitrogen turnover
; Northern Hemispheres
; Nutrient availability
; Terrestrial ecosystems
; Tropical montane forest
; Climate change
; Ecosystems
; Nitrogen
; Rain
; Soil moisture
; Forestry
; ammonification
; anthropogenic effect
; concentration (composition)
; environmental change
; flow pattern
; montane forest
; nitrogen cycle
; Northern Hemisphere
; tropical forest
; waterlogging
; Amazon Basin
; Ecuador
英文摘要: Water-bound nitrogen (N) cycling in temperate terrestrial ecosystems of the Northern Hemisphere is today mainly inorganic because of anthropogenic release of reactive N to the environment. In little-industrialized and remote areas, in contrast, a larger part of N cycling occurs as dissolved organic N (DON). In a north Andean tropical montane forest in Ecuador, the N cycle changed markedly during 1998-2010 along with increasing N deposition and reduced soil moisture. The DON concentrations and the fractional contribution of DON to total N significantly decreased in rainfall, throughfall, and soil solutions. This inorganic turn of the N cycle was most pronounced in rainfall and became weaker along the flow path of water through the system until it disappeared in stream water. Decreasing organic contributions to N cycling were caused not only by increasing inorganic N input but also by reduced DON production and/or enhanced DON decomposition. Accelerated DON decomposition might be attributable to less waterlogging and higher nutrient availability. Significantly increasing NO 3-N concentrations and NO3-N/NH4-N concentration ratios in throughfall and litter leachate below the thick organic layers indicated increasing nitrification. In mineral soil solutions, in contrast, NH4-N concentrations increased and NO3-N/NH 4-N concentration ratios decreased significantly, suggesting increasing net ammonification. Our results demonstrate that the remote tropical montane forests on the rim of the Amazon basin experienced a pronounced change of the N cycle in only one decade. This change likely parallels a similar change which followed industrialization in the temperate zone of the Northern Hemisphere more than a century ago. ©2013. 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/77560
Appears in Collections: 气候变化事实与影响
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作者单位: Geographic Institute, University of Berne, Hallerstrasse 12, CH-3012 Berne, Switzerland; Institute of Geography, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany; Faculty of Geography, Philipps-Universität Marburg, Marburg, Germany; General Research Directorate, National University of Loja, Loja, Ecuador
Recommended Citation:
Wilcke W,, Leimer S,, Peters T,et al. The nitrogen cycle of tropical montane forest in Ecuador turns inorganic under environmental change[J]. Global Biogeochemical Cycles,2013-01-01,27(4)