Fig 3.

Means of relative ¹³C content (%, ± SE, n = 4) recovered from starch of (A) new fine roots and (B) of fine roots of class ≤0.5 mm for different seasons of ¹³CO₂ pulse-labelling (spring, summer, autumn) and for different harvesting seasons (spring, summer, autumn) in controls and in clipped trees (logarithmic display). Relative ¹³C contents are expressed in percentage of the maximum needle signals. Significant differences between control and clipped trees are given with * (P<0.05).