Free access
Issue
Ann. For. Sci.
Volume 55, Number 5, 1998
Page(s) 577 - 588
DOI http://dx.doi.org/10.1051/forest:19980505
Ann. For. Sci. 55 (1998) 577-588
DOI: 10.1051/forest:19980505

Influence de la fertilisation sur la pérennité des aiguilles de jeunes Pinus sylvestris en plantation forestière

Ahmad Rahmani, Jean-Pierre Verger, Daniel Petit and Alban Laroche

Biologie cellulaire et valorisation des espèces ligneuses, faculté des sciences de Limoges, 87060 Limoges cedex, France

Résumé - L'action favorable des fertilisants sur la croissance in situ de jeunes plants de Pinus sylvestris résulte d'un ensemble complexe de facteurs. Outre l'amélioration des conditions de la nutrition minérale qui conduit à une plus grande incorporation des éléments par la plante, les modifications de la pérennité des aiguilles constituent un facteur essentiel. En Haute-Corrèze sur rédoxisol très oligotrophe les apports en magnésium et en microéléments influent favorablement sur la pérennité des aiguilles et sur la croissance. (© Inra/Elsevier, Paris)


Abstract - Note about the effects of fertilization on senescence needles of Pinus sylvestris. The positive effect of fertilization on plant growth is related to improvement of soil nutrient availability and plant uptake. Dry weigth of two years old needles was increased by fertilization (table III). Mean 2 years old needles dry weight for one tree was 0.39 g for control. This was multiplied by 1.4 for Ca, 2.4 for CaMg and NPKCaMg and 3.8 for complete treament (including microelements). Mineral analysis of needles (table IV) indicated that Ca concentration was increased significantly in all fertilized plots. Mg and K contents were increased significantly in treatment with Mg supply. The Mn concentration was significantly decreased by fertilization. In Haute-Corrèze (France) a delay of the senescence period can have a positive effect on photosynthesis of young scots pine and consequently on growth and biomass rate. (© Inra/Elsevier, Paris)


Key words: Pinus sylvestris / mineral nutrition / magnesium / microelements / senescence needles

Mots clés : Pinus sylvestris / nutrition minérale / magnésium / microéléments / pérennité des aiguilles