BUILDING MODELS OF GROWTH AND INCREMENTAL GROWTH OF Tectona grandis Linn. f PLANTATION AT YEN CHAU, SON LA
Keywords:
Growth, incremental growth, TTectona grandis plantation, forest business, Son LaAbstract
In research as well as practice in forestry production, modeling the growth of planted forests over time is always considered an important task, as a basis for determining the main harvesting time. Therefore, it is necessary to build growth models (diameter, height, trunk volume, forest volume, etc. by age) on individual trees and planted forest stands by mathematical equations. This research analyzes and predicts the growth and incremental growth of Tectona grandis plantations with standard trees in Yen Chau district, Son La province in order to determine the amount of regular growth and periodic growth according to age as a basis for forecasting of main exploitation age for forest stand. Five growth functions were used to describe the growth process in terms of stem diameter (D1,3), height (Hvn) and volume (V) for research subjects such as: Schumacher, Koller, Korf, Terazaki, and Gompertz, where the selected equation is the one with the parameters that exist in the population and has the maximum coefficient of determination (R2max). Research results showed that growth and incremental growth in stem diameter (D1,3), height (Hvn) and volume (V) are very well described by Schumacher function with R2 from 0,994 to 0,998, the growth equations as below: D = 49,261*exp (-3,871/A**0,450); H = 54,238*exp (-5,011/A**0,48O); V = 2,167*exp (-1o,468/A** 0,529).
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