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| Titel |
Implications of incorporating N cycling and N limitations on primary production in an individual-based dynamic vegetation model |
| VerfasserIn |
B. Smith, D. Wårlind, A. Arneth, T. Hickler, P. Leadley, J. Siltberg, S. Zaehle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 7 ; Nr. 11, no. 7 (2014-04-10), S.2027-2054 |
| Datensatznummer |
250117356
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| Publikation (Nr.) |
 copernicus.org/bg-11-2027-2014.pdf |
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| Zusammenfassung |
| The LPJ-GUESS dynamic vegetation model uniquely combines an individual- and
patch-based representation of vegetation dynamics with ecosystem
biogeochemical cycling from regional to global scales. We present an updated
version that includes plant and soil N dynamics, analysing the implications
of accounting for C–N interactions on predictions and performance of the
model. Stand structural dynamics and allometric scaling of tree growth
suggested by global databases of forest stand structure and development were
well reproduced by the model in comparison to an earlier multi-model study.
Accounting for N cycle dynamics improved the goodness of fit for broadleaved
forests. N limitation associated with low N-mineralisation rates reduces
productivity of cold-climate and dry-climate ecosystems relative to mesic
temperate and tropical ecosystems. In a model experiment emulating free-air
CO2 enrichment (FACE) treatment for forests globally, N limitation
associated with low N-mineralisation rates of colder soils reduces CO2
enhancement of net primary production (NPP) for boreal forests, while some
temperate and tropical forests exhibit increased NPP enhancement. Under a
business-as-usual future climate and emissions scenario, ecosystem C storage
globally was projected to increase by ca. 10%; additional N requirements
to match this increasing ecosystem C were within the high N supply limit
estimated on stoichiometric grounds in an earlier study. Our results
highlight the importance of accounting for C–N interactions in studies of
global terrestrial N cycling, and as a basis for understanding mechanisms on
local scales and in different regional contexts. |
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