Carbon fluxes above a deciduous forest in Greece

Nikolaos Proutsos, Αristotle Liakatas, Stavros Alexandris, Ioannis Tsiros

Abstract

Photosynthetic production in forest ecosystems occurs through the absorption of light and CO2. The present work deals with CO2 and carbon flux densities above a deciduous forest in Greece, the southernmost monitoring site in Europe. Results show annual net carbon absorption of 7.6 t C ha–1 y–1, indicating that this forest is a strong carbon sink compared to other European sites. However, absorbance may be reduced by 1 μmol m–2 s–1 for every 1.5 ºC above-canopy air temperature increase or 0.015 cm3 cm–3 active root-zone moisture depletion, beyond estimated optimum values. The forest acts as a carbon sink from late April to early November and as a source of carbon in the remaining period of the year. The highest CO2 net absorption flux occurs during June-July (approximately 200 g C m–2 month–1).

Keywords

Carbon fluxes; oak forest; photosynthetic active radiation (PAR); net radiation (Rnet); temperature; net ecosystem exchange (NEE)

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