VOLUME-BASED NUTRIENT CONTENT OF <em>ACACIA <em>MANGIUM</em>, <em>EUCALYPTUS</em> <em>DEGLUPTA</em> AND <em>PARASERIANTHES</em> <em>FALCATARIA</em> IN INDUSTRIAL TREE PLANTATIONS IN EAST KALIMANTAN, INDONESIA

Abstract

Nutrient concentrations in stemwood, stembark, branches and leaves of Acacia mangium, Eucalyptus deglupta and Paraserianthes falcataria were analysed and compared to results by other studies. Nutrient concentrations differed significantly across components. Species-specific differences were profound. The weight-volume ratio for A. mangium and E. deglupta was described best with an exponential model, while for P. falcataria a simple linear model was sufficient. All equations were highly significant (R²> 0.83). Stand nutrient storage in 200 m³ ha^-1 stemwood and stembark ranged between 75-202 kg N, 2.6-9.5 kg P, 73-208 kg K, 85-161 kg Ca and 10-21 kg Mg. Nutrients stored in branches and leaves amounted to 70-223% of the N and P, and 29-164% of the K, Ca and Mg storage in stems.