Fig. 4From: Tree patch distribution drives spatial heterogeneity of soil traits in cork oak woodlandsRelationship of leaf fall magnesium concentration with soil exchangeable calcium at a depth of 0–20 cm (A) and with soil pH at a depth of 20–100 cm. The correlation coefficients (r), the p value, the coefficient of determination (R 2), and the equation for the regression lines are indicatedBack to article page