A spatial statistical analysis of cork oak competition in two Portuguese silvopastoral systems

Authors: Paulo M.J.; Stein A.; Tomé M.

Source: Canadian Journal of Forest Research, Volume 32, Number 11, November 2002 , pp. 1893-1903(11)

Publisher: NRC Research Press

Abstract:

This paper considers competition among cork oaks (Quercus suber L.) at three plots in two representative Portuguese stands. It uses spatial point pattern functions to describe densities and quantify differences among stands. Relations between cork oak characteristics and indices measuring intertree competition are modelled. Tree competition has a significant effect on tree crown characteristics. In particular, cork oaks with much competition have smaller and more elongated crowns. A standard model that relates crown diameter with diameter at breast height was improved. The R² value increased from 0.53 to 0.63 by including a crown shape parameter and competition indices.

Cet article examine la compétition entre les chênes-lièges (Quercus suber L.) dans trois parcelles situées dans deux peuplements représentatifs du Portugal. Des fonctions spatiales de distribution de points sont utilisées pour décrire la densité et quantifier les différences entre les peuplements. Les relations entre les caractéristiques des chênes-lièges et les indices de compétition entre les arbres sont modélisées. La compétition a un effet significatif sur les caractéristiques de la cime des arbres. Plus spécifiquement, les chênes-lièges qui subissent une forte compétition ont une cime plus petite et plus allongée. Un modèle standard reliant le diamètre de la cime au diamètre à hauteur de poitrine a été amélioré. La valeur de R² augmente de 0,53 à 0,63 en y incluant un paramètre pour la forme de la cime et des indices de compétition. [Traduit par la rédaction]

Language: English

Document Type: Research article

Publication date: 2002-11-01

• Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
• Information for Authors
• Submit a Paper
• Subscribe to this Title
• Terms & Conditions
• Sample Issue
• Reprints & Permissions
• ingentaconnect is not responsible for the content or availability of external websites

• In this: publication
• By this: publisher
• In this Subject: Agriculture (General) ,  Forestry
• By this author: Paulo M.J. ;  Stein A. ;  Tomé M.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers