3.2.3. Above Ground Woody Compartments and Roots
The Cu and Ni concentrations of the youngest shoots were much lower than those of bark, but there were no statistically significant differences between the treat- ments (Figure 3). The Cu and Ni concentrations in pine wood appeared to be slightly higher on the control plots, but the differences were not statistically significant (Figure 4)
The mean Cu and Ni concentrations in both pine and birch roots were slightly higher on the control plots com- pared to the mulch treatment, but the differences were not statistically significant (Figure 5).