globalchange  > 气候变化事实与影响
DOI: 10.1002/gbc.20026
Scopus记录号: 2-s2.0-84881094950
论文题名:
The contribution of nitrogen deposition to the photosynthetic capacity of forests
作者: Fleischer K; , Rebel K; T; , Van Der Molen M; K; , Erisman J; W; , Wassen M; J; , Van Loon E; E; , Montagnani L; , Gough C; M; , Herbst M; , Janssens I; A; , Gianelle D; , Dolman A; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期:1
起始页码: 187
结束页码: 199
语种: 英语
英文关键词: canopy photosynthesis ; carbon sequestration ; FLUXNET ; nitrogen deposition ; nitrogen saturation ; photosynthetic capacity
Scopus关键词: Canopy photosynthesis ; Carbon sequestration ; FluxNet ; Nitrogen deposition ; Nitrogen saturation ; Photosynthetic capacity ; Carbon ; Carbon dioxide ; Ecosystems ; Nitrogen ; Photosynthesis ; Forestry ; biogeochemistry ; broad-leaved forest ; carbon sequestration ; carbon sink ; climate effect ; concentration (composition) ; data set ; deciduous forest ; eddy covariance ; flux measurement ; forest ecosystem ; net primary production ; photosynthesis ; saturation ; threshold
英文摘要: Global terrestrial carbon (C) sequestration has increased over the last few decades. The drivers of carbon sequestration, the geographical spread and magnitude of this sink are however hotly debated. Photosynthesis determines the total C uptake of terrestrial ecosystems and is a major flux of the global C balance. We contribute to the discussion on enhanced C sequestration by analyzing the influence of nitrogen (N) deposition on photosynthetic capacity (Amax) of forest canopies. Eddy covariance measurements of net exchange of carbon provide estimates of gross primary production, from which Amax is derived with a novel approach. Canopy Amax is combined with modeled N deposition, environmental variables and stand characteristics to study the relative effects on Amax for a unique global data set of 80 forest FLUXNET sites. Canopy Amax relates positively to N deposition for evergreen needleleaf forests below an observed critical load of ∼ 8 kg N ha-1 yr-1, with a slope of 2.0 ± 0.4 (S.E.) μmol CO2 m-2 s-1 per 1 kg N ha-1 yr-1. Above this threshold canopy A max levels off, exhibiting a saturating response in line with the N saturation hypothesis. Climate effects on canopy Amax cannot be separated from the effect of N deposition due to considerable covariation. For deciduous broadleaf forests and forests in the temperate (-continental) climate zones, the analysis shows the N deposition effect to be either small or absent. Leaf area index and foliar N concentration are positively but weakly related to Amax. We conclude that flux tower measurements of C fluxes provide valuable data to study physiological processes at the canopy scale. Future efforts need to be directed toward standardizing measures N cycling and pools within C monitoring networks to gain a better understanding of C and N interactions, and to disentangle the role of climate and N deposition in forest ecosystems. ©2013. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77602
Appears in Collections:气候变化事实与影响

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作者单位: Department of Earth Sciences, Cluster Earth and Climate, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands; Faculty of Geosciences, Copernicus Institute of Sustainable Development, Utrecht University, Utrecht, Netherlands; Meteorology and Air Quality Group, Wageningen University and Research Centre, Wageningen, Netherlands; Louis Bolk Institute, Driebergen, Netherlands; Computational Geo-Ecology, Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands; Faculty of Science and Technology, Free University of Bozen, Bozen-Bolzano, Italy; Department of Biology, College of Humanities and Sciences, Virginia Commonwealth University, Richmond, VA, United States; Department of Bioclimatology, Faculty of Forest Sciences and Forest Ecology, Georg-August-University Göttingen, Göttingen, Germany; Department of Biology, University of Antwerp, Wilrijk, Belgium; Sustainable Agro-ecosystems and Bioresources Department, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, TN, Italy; Forest Services, Autonomous Province of Bolzano, Bozen-Bolzano, Italy

Recommended Citation:
Fleischer K,, Rebel K,T,et al. The contribution of nitrogen deposition to the photosynthetic capacity of forests[J]. Global Biogeochemical Cycles,2013-01-01,27(1)
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