Croissance et production du pin d’Alep (Pinus halepensis Mill.) en Tunisie

Abstract

Growth and yield models for Aleppo pine (Pinus halepensis Mill.) stands in Tunisia were adjusted from data obtained in 348 temporary plots. Four site quality of 13,5 ; 10,5 ; 7,5 et 4,5 were obtained from site index model adjusted with polymorphic difference equation derived from the Lundqvist-Korf function. The site index was defined as dominant height at 50 years of age. Thanks to this site index model and other developed sub-models, two types of yield tables were elaborated and compared. The first tables were developed using the average observed silviculture and the seconds using a simulation with the Hart-Becking index. With increments and total volume comparable, tables resulting from simulation with Hart-Becking index, give stems with much more significant sizes at the end of the rotation fixed at 80 years. For a broad use of the elaborated yield tables, these tables can be accompanied by complementary tables which present the distribution of trees and volumes by diameter classes. These last tables can be simulated by using the model of stems distribution by diameter classes, adjusted within the framework of the same study.