Optimizing management of even-aged teak stands using growth simulation model: a case study in Kerala
2008
Jayaraman, K. | Rugmini, P.
A growth simulation model was developed for even-aged teak stands to derive optimal density management plans. The optimal rotation age and effects of understorey species on the growth of teak were ascertained. The growth model consisted of five modules, i.e. effects of site index, unrestrained growth, ageing, density of teak and density of miscellaneous species. The model was calibrated based on data gathered from 69 permanent sample plots established in teak plantations in Kerala, India. A model was developed in order to identify the optimum density trajectory that maximized the net present value (NPV) of cash flows. Optimum density regimes were worked out for different interest rates in all the site quality classes, with and without miscellaneous species (understorey) in the stands. The relative initial density that maximized the NPV varied from 0.41 for site quality I to 0.21 for site quality IV regardless of interest rate. The rate of increase in initial density required for attaining the optimum was 3% every five years. For any particular interest rate, the optimal rotation age remained the same under all site quality classes. However, the optimal rotation age changed from 65 to 40 years as the interest rate changed from 2 to 5%. Understorey species in teak plantations had a significant effect on the growth of teak trees. The percentage increase due to the absence of miscellaneous growth was about 16% for crop diameter and 23% for mean annual increment of volume over a rotation period. Consequently, there was an increase of 56% in NPV for all the site quality and interest levels.
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