Fig. 2From: Long-term logging residue loadings affect tree growth but not soil nutrients in Pinus contorta Doug. ex Loud. forestsThe difference in foliar boron (B) contents after the 19-year period between four logging residue loading treatments. Values are the means ± SE of five plots. The different letters in the same column mean significant difference based on ANOVA and Tukey’s test (P < 0.05)Back to article page