Abstract
Studies on functional relationships between relative stem diameter and height to estimate timber yield are useful in the management of commercial forest plantations. With taper analysis data of 42 Pinus pseudostrobus Lindl. trees in the indigenous community of Nuevo San Juan Parangaricutiro , Michoacan, Mexico, six compatible systems for predicting taper (d), merchantable volume (Vm), stem volume (Vs), total tree volume (Vt) and branch volume (Vb) were fitted and evaluated. The compatible taper and merchantable volume equations were based on volume ratio equations. Three Vs equations were tested in each system. In general, the compatible systems presented statistical accuracy in the d, Vm, Vs and Vt components but were less accurate in Vb. Three compatible systems were selected, according to their more efficient goodness-of-fit statistics, and a different total volume equation was incorporated into each system. The compatible systems based on volume ratio equations are simple, reliable tools for estimation of stand timber stocks and product classification of P. pseudostrobus in commercial forest plantations in Mexico.
Highlights
IntroductionTotal stem volume equations are reliable tools in quantifying timber stocks
With the growing demand for wood, accurate estimation and prediction of volume is an essential activity of forest managers to determine economic yield and, select species and silvicultural treatments to be applied in a specific condition for a given period of forest rotation [1,2].Total stem volume equations are reliable tools in quantifying timber stocks
The objective of this study was to develop compatible systems based on volume ratio equations to estimate d, Vm, Vs, Vt and Vb for P. pseudostrobus in commercial forest plantations from Michoacan, Mexico
Summary
Total stem volume equations are reliable tools in quantifying timber stocks. Merchantable volume should be included to consider the products that have an influence in economic yield [2]. Measurements of tree stem diameter and height can be used to estimate total and merchantable volume, usually using taper and volume ratio equations [3,4]. Flexible tools for estimating total and merchantable volumes in both growth models and forest inventories [5]. When they are integrated, they can provide estimations of volume at the upper height limit as well as at the total tree height
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