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| Titel |
Soil respiration at mean annual temperature predicts annual total across vegetation types and biomes |
| VerfasserIn |
M. Bahn, M. Reichstein, E. A. Davidson, J. Grünzweig, M. Jung, M. S. Carbone, D. Epron, L. Misson, Y. Nouvellon, O. Roupsard, K. Savage, S. E. Trumbore, C. Gimeno, J. Curiel Yuste, J. Tang, R. Vargas, I. A. Janssens |
| 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. 7 ; Nr. 7, no. 7 (2010-07-09), S.2147-2157 |
| Datensatznummer |
250004894
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| Publikation (Nr.) |
 copernicus.org/bg-7-2147-2010.pdf |
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| Zusammenfassung |
| Soil respiration (SR) constitutes the largest flux of CO2 from
terrestrial ecosystems to the atmosphere. However, there still exist
considerable uncertainties as to its actual magnitude, as well as its
spatial and interannual variability. Based on a reanalysis and synthesis of
80 site-years for 57 forests, plantations, savannas, shrublands and
grasslands from boreal to tropical climates we present evidence that total
annual SR is closely related to SR at mean annual soil temperature
(SRMAT), irrespective of the type of ecosystem and biome. This is
theoretically expected for non water-limited ecosystems within most of the
globally occurring range of annual temperature variability and sensitivity
(Q10). We further show that for seasonally dry sites where annual
precipitation (P) is lower than potential evapotranspiration (PET), annual
SR can be predicted from wet season SRMAT corrected for a factor
related to P/PET. Our finding indicates that it can be sufficient to measure
SRMAT for obtaining a well constrained estimate of its annual total.
This should substantially increase our capacity for assessing the spatial
distribution of soil CO2 emissions across ecosystems, landscapes and
regions, and thereby contribute to improving the spatial resolution of a
major component of the global carbon cycle. |
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