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Low historical nitr...
Low historical nitrogen deposition effect on carbon sequestration in the boreal zone
- Article/chapterEnglish2015
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LIBRIS-ID:oai:lup.lub.lu.se:646c7fc7-ebc2-40d0-81c6-49263aa8fbe2
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https://lup.lub.lu.se/record/8731654URI
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https://doi.org/10.1002/2015JG002988DOI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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Nitrogen (N) cycle dynamics and N deposition play an important role in determining the terrestrial biosphere's carbon (C) balance. We assess global and biome-specific N deposition effects on C sequestration rates with the dynamic global vegetation model LPJ-GUESS. Modeled CN interactions are evaluated by comparing predictions of the C and CN version of the model with direct observations of C fluxes from 68 forest FLUXNET sites. N limitation on C uptake reduced overestimation of gross primary productivity for boreal evergreen needleleaf forests from 56% to 18%, presenting the greatest improvement among forest types. Relative N deposition effects on C sequestration (dC/dN) in boreal, temperate, and tropical sites ranged from 17 to 26kgCkgN(-1) when modeled at site scale and were reduced to 12-22kgCkgN(-1) at global scale. We find that 19% of the recent (1990-2007) and 24% of the historical global C sink (1900-2006) was driven by N deposition effects. While boreal forests exhibit highest dC/dN, their N deposition-induced C sink was relatively low and is suspected to stay low in the future as no major changes in N deposition rates are expected in the boreal zone. N deposition induced a greater C sink in temperate and tropical forests, while predicted C fluxes and N-induced C sink response in tropical forests were associated with greatest uncertainties. Future work should be directed at improving the ability of LPJ-GUESS and other process-based ecosystem models to reproduce C cycle dynamics in the tropics, facilitated by more benchmarking data sets. Furthermore, efforts should aim to improve understanding and model representations of N availability (e.g., N fixation and organic N uptake), N limitation, P cycle dynamics, and effects of anthropogenic land use and land cover changes.
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Wårlind, DavidLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)da5584wa
(author)
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van der Molen, M. K.
(author)
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Rebel, K. T.
(author)
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Arneth, A.
(author)
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Erisman, J. W.
(author)
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Wassen, M. J.
(author)
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Smith, BenjaminLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)ple-bsm
(author)
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Gough, C. M.
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Margolis, H. A.
(author)
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Cescatti, A.
(author)
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Montagnani, L.
(author)
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Arain, A.
(author)
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Dolman, A. J.
(author)
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Institutionen för naturgeografi och ekosystemvetenskapNaturvetenskapliga fakulteten
(creator_code:org_t)
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In:Journal of Geophysical Research - Biogeosciences120:12, s. 2542-25612169-8953
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Fleischer, K.
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Wårlind, David
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van der Molen, M ...
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Rebel, K. T.
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Arneth, A.
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Erisman, J. W.
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Wassen, M. J.
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Smith, Benjamin
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Gough, C. M.
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Margolis, H. A.
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Cescatti, A.
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Montagnani, L.
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Arain, A.
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Dolman, A. J.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Climate Research
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Lund University