Abstract
ABSTRACTHeight-age growth models and site index curves were developed for the site quality evaluation of Acacia mangium Willd and Eucalyptus pellita F. Muel stands in Korintiga Hutani plantation, Pangkalan Bun, Central Kalimantan, Indonesia. In this study, the Chapman-Richards growth function was used in the guide curve method to generate anamorphic site index curves for the two species. In order to evaluate the developed models, coefficient of determination (R2), root mean square error (RMSE), bias (), absolute mean difference (AMD), and mean percent bias (MPB) were used as statistical criteria. In addition, a simple linear regression and simultaneous F-test was performed to evaluate the relationship of the observed and the predicted dominant height of each species. Based on the statistical evaluations, simple linear regression and F-test models developed for the two species showed satisfactory results. Furthermore, the developed models explained about 98.35% and 98.60% of the total variation in the estimate of total dominant height for Acacia mangium and Eucalyptus pellita, respectively. The developed site index curves are expected to be significant for forest managers in predicting the growth patterns and classifying the site productivities of the different stands in Korintiga Hutani plantation.
Highlights
IntroductionTropical forest plantations and tree farms are becoming more important because they reduce pressures from the natural and residual forest resources by increasing the supply of wood and other forest-based raw materials
Muell.) are the two main species used in the tropical forest plantation of Pangkalan Bun, Central Kalimantan, Indonesia, which accounts for more than 93% of the total forested area (Korea Forest Research Institute 2008)
Tropical forest plantations and tree farms are becoming more important because they reduce pressures from the natural and residual forest resources by increasing the supply of wood and other forest-based raw materials
Summary
Tropical forest plantations and tree farms are becoming more important because they reduce pressures from the natural and residual forest resources by increasing the supply of wood and other forest-based raw materials. They can increase employment generation while improving the ecological conditions of the denuded forest areas (Lumbres et al 2012b). Site quality evaluation using site index equations is still insufficient for Acacia mangium and Eucalyptus pellita in Pangkalan Bun, Central Kalimantan, Indonesia. The objectives of this study are to develop the height-age model for Acacia mangium and Eucalyptus pellita and to develop anamorphic site index curves using the Chapman-Richards growth function (Richards 1959; Chapman 1961)
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