Improving models of forest nutrient export with equations that predict the nutrient concentration of tree compartments |
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Authors: | Laurent Augusto Céline Meredieu Didier Bert Pierre Trichet Annabel Porté Alexandre Bosc Frédéric Lagane Denis Loustau Sylvain Pellerin Frédéric Danjon Jacques Ranger Jacques Gelpe |
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Institution: | 1. UMR1220 TCEM, INRA, BP81, F-33883, Villenave d’Ornon Cedex, France 2. UR1263 EPHYSE, INRA, 69 route d’Arcachon, F-33612, Cestas Cedex, France 3. UMR1202 BIOGECO, INRA, 69 route d’Arcachon, F-33612, Cestas Cedex, France 4. UR1138 BEF, INRA, F-54280, Champenoux Cedex, France
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Abstract: | ? 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 ≈ 15 cm; branch diameter ≈ 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. |
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