Fig. 4. Average basal area increment (BAI) trend of dominant and codominant trees since 1960 as a function of (a) exchangeable acidity and (b) base saturation of the forest floor in 14 sugar maple stands.
Fig. 4. Average basal area increment (BAI) trend of dominant and codominant trees since 1960 as a function of (a) exchangeable acidity and (b) base saturation of the forest floor in 14 sugar maple stands.