TAILIEUCHUNG - Báo cáo lâm nghiệp:"Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes after eight years in Québec (Canada)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes after eight years in Québec (Canada)" | 691 Ann. For. Sci. 60 2003 691-699 INRA EDP Sciences 2004 DOI forest 2003063 Original article Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes after eight years in Québec Canada Robert Jobidon Vincent Roy Guillaume Cyr Ministère des Ressources naturelles de la Faune et des Parcs du Québec Direction de la recherche forestière 2700 Einstein Sainte-Foy Québec G1P 3W8 Canada Received 24 June 2002 accepted 20 February 2003 Abstract - A study was established in 1993 to determine the response of four black spruce Picea mariana and white spruce P. glauca stock sizes on two sites located in Québec Canada each representing a different type of competing vegetation. At each site a split-split-plot design with 15 to 17 replicates was used in which the presence of competition weedy and bare plots seedling initial size and spruce species were assigned respectively to the whole plot the subplot and the sub-subplot. Larger initial seedling size provided a greater competitive ability for light and had higher growth rates than the standard stock size for both species. Growth gains from combining plantation of large stock with vegetation control were multiplicative. Non-crop vegetation significantly lowered the seasonal profile of 10-cm depth soil temperature on both sites. This study shows that early release treatment is required on sites dominated by raspberry-hardwood competition complex and planting large spruce stock on such harsh competition sites will help reduce the need for repeated vegetation control. large seedling competition vegetation control soil temperature release treatment Résumé - Effet net de la végétation de compétition sur certaines conditions environnementales et sur la performance de quatre dimensions de plants d épinette après huit ans. Une étude a été établie en 1993 afin de déterminer la performance de quatre dimensions de semis d épinette noire Picea mariana et d épinette .

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