Carbon exchange between the terrestrial biosphere and the atmosphere is one of the key processes that need to be assessed in the context of the Kyoto Protocol1. Several studies suggest that the terrestrial biosphere is gaining carbon2,3,4,5,6,7,8, but these estimates are obtained primarily by indirect methods, and the factors that control terrestrial carbon exchange, its magnitude and primary locations, are under debate. Here we present data of net ecosystem carbon exchange, collected between 1996 and 1998 from 15 European forests, which confirm that many European forest ecosystems act as carbon sinks. The annual carbon balances range from an uptake of 6.6 tonnes of carbon per hectare per year to a release of nearly 1 t C ha-1 yr-1, with a large variability between forests. The data show a significant increase of carbon uptake with decreasing latitude, whereas the gross primary production seems to be largely independent of latitude. Our observations indicate that, in general, ecosystem respiration determines net ecosystem carbon exchange. Also, for an accurate assessment of the carbon balance in a particular forest ecosystem, remote sensing of the normalized difference vegetation index or estimates based on forest inventories may not be sufficient.
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The work has been done during the three-year duration of the EUROFLUX project, funded by the European Union. Further funding was provided by the Dutch Ministry of Agriculture, Fisheries and Nature Management (site 6); the Academy of Finland (site 21); the Autonomous Province of Bolzano, Italy (site 4); and the Georg-August Universität, Göttingen, Germany (site 13). A large number of technicians, graduate and doctoral students are acknowledged for help in site management, data collection and elaboration.
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Valentini, R., Matteucci, G., Dolman, A. et al. Respiration as the main determinant of carbon balance in European forests . Nature 404, 861–865 (2000). https://doi.org/10.1038/35009084
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