Comportement des provenances de pin d’Alep (Pinus halepensis Mill.) dans le semi aride tunisien (original) (raw)

Mill.) in tunisian semi-arid zone. With the beginning of the years 1960, a long-term experimental design was established in Tunisian half-dry area to compare 40 local and introduced origins of Aleppo pine (Pinus halepensis Mill.). After 36 years of growth, measurements relating to the growth in height, diameter, the general shape of the trees and the density of wood measured on and under bark were taken. For better controlling the space heterogeneity of the ground, a nearest neighbour model was used to adjust the observed data according to the local fertility. On the basis of adjusted data, the statistical methods, whose univariate and multivariate variance analysis, principal components analysis and cluster analysis are applied to choice the best origins for a reforestation program.

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