The concentration of macronutrients (N、P、K、Ca、Mg) in the roots, bole and branches of Picea balfouriana were investigated. In a 31.61kg (32 year old) Picea balfouriana individual, the roots, bole, bole bark, branches and needles accounted for 14.82%, 42.23%, 9.98%, 19.96% and 13.20% respectively. The characteristic allocation of macronutrients in an individual plant decreased from: barks>branches>roots>woods, respectively. With increasing branch age, N, P, K concentrations were found to decrease, but Ca conc...