Table 3 Total root density (RD, i.e. the number of fine roots per m² of vertical plane down to 1.20 m in depth), root density below the depth of change in soil texture (ca. 0.50 m, RD_b), percentage of roots below this depth (RD_b%), and correlation coefficients (r ²) of relationships between bulk soil density and RD for the studied tree species

From: Differential response to soil drought among co-occurring broad-leaved tree species growing in a 15- to 25-year-old mixed stand