TAILIEUCHUNG - Báo cáo lâm nghiệp: "Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation" | Ann. For. Sci. 62 2005 261-267 INRA EDP Sciences 2005 DOI forest 2005018 261 Original article Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation David POTHIERa Daniel MAILLYb Stéphane TREMBLAYb a Departement des Sciences du bois et de la forêt Université Laval Sainte-Foy Québec G1K 7P4 Canada b Ministère des Ressources naturelles et de la faune du Québec Direction de la recherche forestière 2700 rue Einstein Sainte-Foy Québec G1P 3W8 Canada Received 20 May 2004 accepted 31 August 2004 Abstract - To predict the reduction in growth of balsam fir Abies balsamea L. Mill. subjected to spruce budworm Choristoneura fumiferana Clem. epidemics tree-ring chronologies of dominant trees were related to historical records of defoliation collected in the province of Quebec Canada. These trees were sampled on 136 sites and were harvested for stem analyses that allowed us to calculate indexed radial growth and tree volume increment for a period 1965-1995 that covers the last insect outbreak. Defoliation variables explained 36 and 23 of the annual changes in ring width index and annual volume increment index respectively. Defoliation that dated back by as much as six years affected current-year growth whereas current-year defoliation had limited impact. Several severe annual defoliation events reduced volume growth of dominant balsam fir by 50 over a 10-year period. These results can help predict future growth reduction among dominant balsam fir trees subjected to different scenarios of spruce budworm defoliation over broad areas. balsam fir spruce budworm defoliation class growth reduction stem analysis Résumé - Prediction de la reduction de croissance du sapin baumier causée par la tordeuse des bourgeons de l epinette en utilisant des relevés historiques de defoliation recueillis à grande échelle. Afin de prédire les pertes de croissance de sapins baumiers Abies balsamea L. Mill. soumis à des épidémies de .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp