Fig. 4

Means (and SE) of C, N, P and cation pools in organic layer and mineral soil of the beech, mixed (beech-oak) and oak stands (n = number of plots). In the case of SOC and N, total pools are given for organic layer and mineral soil. P_av is resin-extractable P in the mineral soil and total P in the organic layer. For the basic cations (Ca, Mg, K), only BaCl₂-exchangeable pools of the mineral soil are given. Profile totals (MS total) of SOC, N and P were calculated for a depth of − 100 cm and for Ca⁺²_ex, Mg⁺²_ex and K⁺_ex for a depth of − 40 cm. Significant differences for MS total and Org. layer (p ≤ 0.05) between forest types are indicated by different small letters (Kruskal–Wallis test with post hoc Pairwise Wilcoxon Rank Sum Test). No samples were taken in the linden forests