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Relations cerne-climat dans des peuplements de Quercus afares Willd et Quercus canariensis Pomel en Algérie

1997; EDP Sciences; Volume: 54; Issue: 4 Linguagem: Inglês

10.1051/forest

1878-6545

M. Messaoudene, Lucien Tessier,

Horticultural and Viticultural Research

Tree-ring to climate relationships for populations of Quercus afares Willd and Quercus canariensis Pomel in Algeria.Ring-width variations are analysed on 15 populations of Quer- cus afares and Quercus canariensis in the Akfadou and Beni-Ghobri Forests (Algeria) (fig 1) which are submitted to temperate and cool variants of the Mediterranean humid bioclimate.The populations selected are representative of the different ecological conditions (substratum, exposure, altitude) under which the two species are growing.After measuring ring-width on three radii per tree and eight to 16 trees per site, a mean ring-width chronology is developed for each population (table I).In order to remove age trend and isolate interannual variations of radial growth, ring-width series are mod- elized using ARMA processes.For each population, a mean chronology of residuals is established.Response function is then calculated, involving the mean residual chronology as dependent vari- able and, in a first step, the 24 monthly parameters of annual climate as regressors (P-T max and P-T min ).