The Hesse site is beech forest plot equipped since 1996 with an eddy covariance system to measure continuously (half-hourly) the net fluxes of CO2, H2O and energy exchanged between ecosystem and atmosphere. Supplementary sensors provide the main meteorological data (temperature, humidity, radiation) and edaphic status (soil water content, soil temp.). Additional field campaigns give information about ecosystem characteristics evolution (Leaf Area Index, trees growth, fine roots biomass), carbon allocation to ecosystem compartments (soil and stem CO2 efflux, heterotrophic respiration) and their isotopic signature (13C).
