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| Titel |
Analyzing the major drivers of NEE in a Mediterranean alpine shrubland |
| VerfasserIn |
B. R. Reverter, E. P. Sánchez-Cañete, V. Resco, P. Serrano-Ortiz, C. Oyonarte, A. S. Kowalski |
| 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 ; 7, no. 9 ; Nr. 7, no. 9 (2010-09-03), S.2601-2611 |
| Datensatznummer |
250004960
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| Publikation (Nr.) |
 copernicus.org/bg-7-2601-2010.pdf |
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| Zusammenfassung |
| Two years of continuous measurements of net ecosystem exchange (NEE) using
the eddy covariance technique were made over a Mediterranean alpine
shrubland. This ecosystem was found to be a net source of CO2 (+ 52 ± 7 g C m−2
and + 48 ± 7 g C m−2 for 2007 and 2008) during the
two-year study period. To understand the reasons underlying this net release
of CO2 into the atmosphere, we analysed the drivers of seasonal
variability in NEE over these two years. We observed that the soil water
availability – driven by the precipitation pattern – and the
photosynthetic photon flux density (PPFD) are the key factors for
understanding both the carbon sequestration potential and the duration of
the photosynthetic period during the growing season. Finally, the effects of
the self-heating correction to CO2 and H2O fluxes measured with
the open-path infrared gas analyser were evaluated. Applying the correction
turned the annual CO2 budget in 2007 from a sink (− 135 ± 7 g C
m−2) to a source (+ 52 ± 7 g C m−2). The magnitude of this
change is larger than reported previously and is shown to be due to the low
air density and cold temperatures at this high elevation study site. |
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