Annals of Forest Science

, Volume 65, Issue 3, pp 308–308 | Cite as

Thinning intensity and growth response in SW-European Scots pine stands

  • Miren del Río
  • Rafael Calama
  • Isabel Cañellas
  • Sonia Roig
  • Gregorio Montero
Original Article

Abstract

The effect of different thinning intensities on growth and yield was studied in Pinus sylvestris L. stands at the south-western limit of its distribution area (Central Spain), using five long-term thinning trials. Data were analysed collectively considering several factors (trial, block, plot and period) as random effects. Total volume and volume increment decreased with thinning intensity, this loss being more significant in the case of moderate and heavy thinning. No difference was found among treatments for total basal area or the increment in basal area. The results revealed an optimum basal area (Assmann’s definition) between 85 and 100% of the basal area in unthinned plots. Volume growth loss associated with heavy thinnings (reduction of 18% in volume increment) was smaller than that reported in Central and Northern European regions (greater than 25%). Height increment was not influenced by thinning, whereas dominant and quadratic mean diameter increments increased with the thinning intensity. The response of diameter growth to thinning was greater at younger ages (less than 50 y) and in medium-sized trees.

thinning Pinus sylvestris growth Mediterranean area long-term trial 

Intensité d’éclaircie et croissance dans des peuplements de pin sylvestre du sud ouest de l’Europe

Résumé

L’effet de différentes intensités d’éclaircie sur la croissance et la production de peuplements de Pinus sylvestris L. a été étudié à la limite sud-ouest de sa zone de répartition (centre de l’Espagne), à partir de cinq essais d’éclaircie suivis à long terme. Les données ont été analysées collectivement en prenant en compte différents facteurs (essai, bloc, placeau et période) comme facteurs aléatoires. Le volume total et l’accroissement en volume diminuaient avec l’intensité d’éclaircie, cette perte devenant plus significative dans le cas d’éclaircies modérées et fortes. Aucune différence n’a été trouvée entre traitements pour la surface terrière totale ni pour sa vitesse d’accroissement. Les résultats révèlent un optimum de surface terrière (selon la définition d’Assmann) compris entre 85–100 % de la surface terrière des placeaux non éclaircis. Les pertes de croissance en volume associées aux éclaircies fortes (réduction de 18 %) étaient plus faibles que celles qui sont rapportées pour les régions du Centre et du Nord de l’Europe (supérieures à 25 %). L’accroissement en hauteur n’a pas été influencé par l’éclaircie alors que l’accroissement quadratique moyen en diamètre augmentait avec l’intensité d’éclaircie. La réponse en termes d’accroissement en diamètre à l’éclaircie a été plus forte pour les jeunes arbres (moins de 50 ans) et les arbres de taille moyenne.

éclaircie Pinus sylvestris croissance région méditerranéenne essai à long terme 

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Copyright information

© Springer S+B Media B.V. 2008

Authors and Affiliations

  • Miren del Río
    • 1
  • Rafael Calama
    • 1
  • Isabel Cañellas
    • 1
  • Sonia Roig
    • 1
  • Gregorio Montero
    • 1
  1. 1.Centre for Forest ResearchINIAMadridSpain

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