Fig. 1

Absolute and relative trajectories of forest a) area, b) volume of the growing stock and c) growing stock density in French forests over the period 1976–2010. Relative changes are expressed as percentages of 1976 estimates. Only the absolute changes were represented for GSD. Volumes are defined on standing trees inventoried from 7.5 cm over bark at dbh (1.30 m height) and describe stem volume up to a final diameter of 7 cm. The 95% bilateral confidence intervals were established using 10,000 bootstrap samples taken from the NFI estimates of sampling errors and are represented in grey (Annex 2). The dashed line in (a) represents the interpolated chronology from inventories enabling the bilateral confidence interval calculation (errors on the first inventories were not available)