Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments

AUGUSTO, Laurent; MEREDIEU, Céline; BERT, Didier; TRICHET, Pierre; PORTE, Annabel; BOSC, Alexandre; LAGANE, Frédéric; LOUSTAU, Denis; PELLERIN, Sylvain; DANJON, Frederic; RANGER, Jacques; GELPE, Jacques

doi:10.1051/forest:2008059

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AUGUSTO, Laurent
Transfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés [TCEM]

MEREDIEU, Céline
Écologie fonctionnelle et physique de l'environnement [EPHYSE]

BERT, Didier
Biodiversité, Gènes & Communautés [BioGeCo]

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Ce document a été publié dans

Annals of Forest Science. 2008, vol. 65, n° 8, p. 808

Springer Nature (since 2011)/EDP Science (until 2010)

Résumé en anglais

The objective of this study was to explore the distribution of major nutrients (N, P, K, Ca and Mg) in the aboveground compartments of an intensively managed tree species (Pinus pinaster Ait.). A total of 53 trees were cut down in even-aged stands respectively 8, 16, 26, 32 and 40 years old. The nutrient concentrations of the aboveground compartments were analysed. Nutrient concentrations of foliage did not vary with any of the variables used, except needle age. Nutrient concentrations of living branches, stem bark, stem sapwood, stem heartwood, stemwood and stem decreased with increasing branch diameter, bark thickness, sapwood thickness and heartwood thickness, respectively. Beyond a certain value of the predictive variable (stem diameter approximate to 15 cm; branch diameter approximate to 2.5 cm), the concentration of all the nutrients stabilised. A 50 year-old pine stand was used to obtain a validation dataset for nitrogen concentration. For this nutrient, the regression relationships gave satisfactory estimates for most compartments (mean error = 12-25%) and particularly for the stem. A procedure is proposed to estimate the nutrient exports associated with harvests of Pinus pinaster biomass.< Réduire

Mots clés

NUTRIMENT

DENDROMETRIE DE L'ARBRE

NUTRIENT

EXPORT

Mots clés en anglais

EXPORTATION

TREE DIMENSION

PIN MARITIME

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