摘要：Photosynthetic production in forest ecosystems occurs through the absorption of light and CO 2 . The present work deals with CO 2 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 CO 2 net absorption flux occurs during June-July (approximately 200 g C m –2 month –1 ).
其他摘要：Photosynthetic production in forest ecosystems occurs through the absorption of light and CO 2 . The present work deals with CO 2 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 CO 2 net absorption flux occurs during June-July (approximately 200 g C m –2 month –1 ).
