Abstract
The study concerning carbon dioxide measurements taken during the 1997, 1998 and 1999 summer campaigns at two different altitude stations and biospheric conditions are presented. The higher station (Mt. Cimone, 2165 m a.s.l.) is characterised by 360° free horizon and is located on a rocky mountain while the lower (Ninfa lake, 1550 m a.s.l.) is located inside the red spruce and beech forest. The different behaviour of CO 2 at the two mountain stations has been registered. It shows the strong effect of nighttime soil emission and vegetation respiration on CO 2 mixing ratio increases and of diurnal vegetative activity on CO 2 concentration decreases at the lower measurement site. The baseline character of the higher measurement site has been confirmed by comparison of CO 2 diurnal amplitudes recorded at the two stations.
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