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| Titel |
Nitrogen feedbacks increase future terrestrial ecosystem carbon uptake in an individual-based dynamic vegetation model |
| VerfasserIn |
D. Wårlind, B. Smith, T. Hickler, A. Arneth |
| 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. 21 ; Nr. 11, no. 21 (2014-11-13), S.6131-6146 |
| Datensatznummer |
250117671
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| Publikation (Nr.) |
 copernicus.org/bg-11-6131-2014.pdf |
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| Zusammenfassung |
| Recently a considerable amount of effort has been put into quantifying how
interactions of the carbon and nitrogen cycle affect future terrestrial
carbon sinks. Dynamic vegetation models, representing the nitrogen cycle with
varying degree of complexity, have shown diverging constraints of nitrogen
dynamics on future carbon sequestration. In this study, we use LPJ-GUESS, a
dynamic vegetation model employing a detailed individual- and patch-based
representation of vegetation dynamics, to evaluate how population dynamics
and resource competition between plant functional types, combined with
nitrogen dynamics, have influenced the terrestrial carbon storage in the past
and to investigate how terrestrial carbon and nitrogen dynamics might change
in the future (1850 to 2100; one representative "business-as-usual" climate
scenario). Single-factor model experiments of CO2 fertilisation and
climate change show generally similar directions of the responses of C–N
interactions, compared to the C-only version of the model as documented in
previous studies using other global models. Under an RCP 8.5 scenario,
nitrogen limitation suppresses potential CO2 fertilisation, reducing the
cumulative net ecosystem carbon uptake between 1850 and 2100 by 61%, and
soil warming-induced increase in nitrogen mineralisation reduces terrestrial
carbon loss by 31%. When environmental changes are considered
conjointly, carbon sequestration is limited by nitrogen dynamics up to the
present. However, during the 21st century, nitrogen dynamics induce a net
increase in carbon sequestration, resulting in an overall larger carbon
uptake of 17% over the full period. This contrasts with previous results
with other global models that have shown an 8 to 37% decrease in carbon
uptake relative to modern baseline conditions. Implications for the
plausibility of earlier projections of future terrestrial C dynamics based on
C-only models are discussed. |
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