Biometric and eddy-covariance based estimates of above-ground carbon uptake

We compare above-ground carbon uptake at five eddy-covariance forest stations in Europe derived from tree-rings and CO₂ fluxes which show highest agreement at seasonal timescales. Carbon uptake rates between 65 and 225 g C m² y⁻¹ could be partitioned into volume increase (Jan–Jun) and cell-wall thickening and storage (Jul–Sep).