Fig. 1From: Age effect on tree structure and biomass allocation in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies [L.] Karst.)Biomass proportion (%) of each aboveground component (stem, branch and foliage) at different age groups in Scots pine and Norway spruce. Error bars indicate the standard errors. Different letters indicate significant differences among different age groups for each component (p < 0.05)Back to article page