Fig. 2From: Tree species diversity impacts average radial growth of beech and oak trees in Belgium, not their long-term growth trendBoxplots of TRW chronologies at each species composition level for beech (a) and oak (b) center trees. O: oak, B: beech, HB: hornbeam and MP: maple. Composition levels without common letters differ significantly at p < 0.05 (Additional file 9: Table S5.S3)Back to article page