GROWTH MODELS FOR UNTHINNED <em>ACACIA</em> <em>MANGIUM</em> PLANTATIONS IN SOUTH KALIMANTAN, INDONESIA

Abstract

Growth models are presented for unthinned plantations of Acacia mangium. The models are based on remeasured data on 24 semipermanent yield study plots (2.3 to 6.8 years of age) in South Kalimantan. In addition, the height data from four small plots from an old provenance trial (0.9 and 2.0 years of age) and from six thinned yield plots (4.0 and 5.0 years of age) were used. The stands had an initial spacing of 2 x 4 m and 3 x 3 m but because of the common multistems the number of stems per hectare varied a lot. Stand growth models for dominant height, survival and basal area and a single tree model for diameter growth were developed. The future development of a stand can be projected from normal inventory data or for different site indices and a limited range of initial spacings without any previously measured data.