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Fine root productivity (FRP) of the six tree species in the three soil depths according to the ingrowth core study (mean ± SE; n = 8 plots). Different capital letters indicate significant differences (p < 0.05) between the species in the soil profile (0–30 cm); significant differences between the soil depths for a given species are indicated by different lower case Latin letters, differences between tree species within a given soil depth by lower case Greek letters.
