tailieunhanh - Báo cáo lâm nghiệp: "Stand structure, competition and growth of Scots pine (Pinus sylvestris L.) in a Mediterranean mountainous environment"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Stand structure, competition and growth of Scots pine (Pinus sylvestris L.) in a Mediterranean mountainous environment. | Ann. For. Sci. 64 2007 825-830 INRA EDP Sciences 2007 DOI forest 2007069 Available online at Original article Stand structure competition and growth of Scots pine Pinus sylvestris L. in a Mediterranean mountainous environment Antonio García-Abril Susana Martin-Fernandez M. Angeles Grande Jose A. Manzanera Technical University of Madrid UPM Research Group for Sustainable Management . Montes Ciudad Universitaria . 28040 Madrid Spain Received 19 January 2007 accepted 4 May 2007 Abstract - The relationship between competition and tree growth was studied in four stands of Pinus sylvestris L. occurring in a continental Mediterranean mountain area in the Guadarrama range Spain . an uneven-aged stand a stand with oak Quercuspyrenaica Willd. understorey a plantation and a mature even-aged stand. Competition was measured by a simple size-ratio distance-independent index and was negatively associated with tree diameter. This negative association was stronger in the uneven-aged plantation and mature even-aged stands than in the stand with oak understorey. Competition was also negatively associated with current diameter increment. This relationship was moderately strong in the mature even-aged stand and weak in the uneven-aged stand and the plantation. In the uneven-aged and the mature even-aged stands a weakly significant relationship was found between diameter growth and tree size whereas these parameters were not associated in the stand with oak understorey. The competition index provided a better prediction of growth rate than the alternative use of diameter. Both diameter and basal area growth were greater in the uneven-aged than in the even-aged stands. competition growth Pinus sylvestris Scots pine stand structure Résumé - Structure des peuplements competition et croissance du pin sylvestre Pinus sylvestris L. dans un environnement montagneux méditerranéen. La relation entre competition et croissance a été étudiée dans quatre .