Diametric growth of two crown classes on half site quality Nothofagus pumilio forests in Santa Cruz (Argentina).
Nothofagus pumilio is the species of largest geographical distribution and economical importance of Patagonia forests. There are few biometric models related to the Patagonia forest management planning. The aim of this work was to construct individual growth models in diameter for different crown classes of medium quality site (SI60 = 9.8 m) N. pumilio forest in Santa Cruz Province (Argentina). The Chapman-Richards model showed good biological and statistical significance. Diameter growth had different behaviour according to the crown classes. The peak of the growth was at 62 and 52 years for the superior and inferior strata, being the maximal averages growth of 0.305 cm/year for dominant trees and of 0.12 cm/year for intermediate trees.