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| Titel |
NEP of a Swiss subalpine forest is significantly driven not only by current but also by previous year's weather |
| VerfasserIn |
S. Zielis, S. Etzold, R. Zweifel, W. Eugster, M. Haeni, N. Buchmann |
| 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. 6 ; Nr. 11, no. 6 (2014-03-26), S.1627-1635 |
| Datensatznummer |
250117309
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| Publikation (Nr.) |
 copernicus.org/bg-11-1627-2014.pdf |
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| Zusammenfassung |
| Understanding the response of forest net ecosystem productivity (NEP) to
environmental drivers under climate change is highly relevant for predictions
of annual forest carbon (C) flux budgets. Modeling annual forest NEP with
soil–vegetation–atmosphere transfer models (SVATs), however, remains
challenging due to unknown delayed responses to weather of the previous year.
In this study, we addressed the influence of previous year's weather on the
interannual variability of NEP for a subalpine spruce forest in Switzerland.
Analysis of long-term (1997–2011) eddy covariance measurements showed that
the Norway spruce forest Davos Seehornwald was a consistent sink for
atmospheric CO2, sequestering 210 ± 88 g C m−2 yr−1 on
average. Previous year's weather strongly affected interannual variability
of NEP, increasing the explained variance in linear models to 53% compared
to 20% without accounting for previous year's weather. Thus, our results
highlight the need to consider previous year's weather in modeling annual C
budgets of forests. Furthermore, soil temperature in the current year's spring
played a major role controlling annual NEP, mainly by influencing gross
primary productivity early in the year, with spring NEP accounting for 56%
of annual NEP. Consequently, we expect an increase in net CO2 uptake
with future climate warming, as long as no other resources become limiting. |
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