Fig. 2From: Tree patch distribution drives spatial heterogeneity of soil traits in cork oak woodlandsMaps of organic matter content (%), pH, nitrogen content (g kg−1), and exchangeable calcium (cmol+ kg−1) predicted by kriging in the study plot. Panels in the left and right columns show prediction for the upper (0–20 cm) and lower (20–100 cm) soil layers, respectively. Polygons depict the projected crown area of all trees in the study plotBack to article page