Fig. 4From: Tree species identity mediates mechanisms of top soil carbon sequestration in a Norway spruce and European beech mixed forestRelationship of the C stock (Mg ha−1) in the forest floor (Ol + Oh + Of, blue), uppermost 10 cm of mineral soil (red), and the total (forest floor + uppermost 10 cm of mineral soil, black) of the mixed plot and the estimated Norway spruce litterfall proportion (n = 77). The Pearson’s correlation coefficient (r) and the p values are indicated for each relationshipBack to article page