全球智库信息集成服务系统

Estimation of the commercial volume to diameters and variable heights for Tectona
grandis L.F. in Costa Rica. Management practices for Tectona grandis have improved
during the last decade. However, accurate volume equations are not available yet. The
aim of this study was to test equations which best predict individual-tree total volume and
merchantable volume (at variable top diameter and top height) for T. grandis in Costa
Rica. A total of 112 trees with ages between 2 and 47 years and breast height
diameter (DBH) between 2.4 and 58.7 cm were felled for the testing of the equations.
The equations tested in this study fitted well the observed data. Other models, tested
elsewhere, tended to overestimate the stem volume, especially at DBH ³ 30 cm. Model
validation with independent data suggested that the models should be calibrated with
local data if high accuracy is required (error less than 10%).