Titre : | Long-term changes in wood density and radial growth of Quercus petraea Liebl. in northern France since the middle of the nineteenth century |
Auteurs : | L. Berges ; J. Dupouey ; CEMAGREF NOGENT SUR VERNISSON EFNO ; A. Franc ; INRA CHAMPENOUX UNITE ECOPHYSIOLOGIE FORESTIERE ; ENGREF PARIS |
Type de document : | article/chapitre/communication |
Année de publication : | 2000 |
Format : | p. 398-408 |
Note générale : |
Sigle : EFNO Sigle : CEMAGREF Sigle : INRA Sigle : ENGREF Diffusion tous publics |
Langues: | = Anglais |
Mots-clés: | FRANCE NORD ; QUERCUS PETRAEA ; DENSITE ; BOIS ; CROISSANCE EN DIAMETRE ; EVOLUTION ; CHANGEMENT CLIMATIQUE ; FACTEUR DE L'ENVIRONNEMENT ; DIOXYDE DE CARBONE ; POLLUTION DE L'AIR |
Résumé : | Long-term changes in sessile oak (Quercus petraea Liebl.) growth and wood density were studied using cores collected from 99 even-aged high forest stands between 56 and 187 years old, located in north-eastern and north-central France. Growth and density trends were tested by analysis of variance and covariance. Two models were applied to two samples, sample A and sample B (sample B being a sub-sample with limited cambial age and calendar date ranges). Model 1 showed a significant increase in radial growth: +35%, +87% and +66% in earlywood width, latewood width and ring width, respectively, from 1811 to 1993 for sample A. Consequently, there was a positive trend in late wood ratio (+14%). A slight decrease in wood density was found: -3.3% and -5.4% for earlywood and late-wood density, respectively. Despite an increase in late wood percentage, mean ring density showed a -2.0% decrease. Model 1 applied to a biomass indicator (density x ring width) showed a 62% increase from 10.4 to 16.8 kg m(-3) between 1811 and 1993 for sample A. Results for sample B were slightly different: the increase in latewood ratio was not detected. Model 2 showed a change with time in the positive hyperbolic relationship between mean density and ring width. The results are discussed. The decrease in wood density cannot be explained by N atmospheric deposition or by long-term changes in average temperature. Increasing atmospheric CO2 levels cannot be invoked owing to the present lack of studies. Finally, hypotheses concerning long-term changes in wood anatomical characteristics are proposed. |
Source : | Trees-Structure and Function, vol. 14, n°7 |
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