Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: The persistence and function of living roots on lodgepole pine snags and stumps grafted to living trees. | Ann. For. Sci. 64 2007 31-36 INRA EDP Sciences 2007 DOI forest 2006085 31 Original article The persistence and function of living roots on lodgepole pine snags and stumps grafted to living trees Erin C. Fraser Victor J. LlEFFERS Simon M. Landhausser Centre for Enhanced Forest Management department of Renewable Resources university of Alberta Edmonton Alberta Canada T6G 2E3 Received 16 May 2006 accepted 27 June 2006 Abstract - In Alberta Canada pairs of grafted lodgepole pine trees were selected to study the longevity and location of live roots of snags that were grafted to living trees to determine the impact of these live residual roots on the diameter growth of the living tree. In a second study dense groups of grafted trees were manually thinned and one leave tree was left to grow for two growing seasons. For both studies roots were excavated. Results indicate that more live roots were maintained on snags connected to living trees with a large graft and that roots located within 90 of the root grafted to the live tree persisted longer. Also tree ring index in the living trees significantly increased following manual thinning but was unaffected when the grafted partner died naturally. Grafts with large phloem connections maintained a higher number of live roots on snags than grafts with small connections. root graft snag manual thinning competition lodgepole pine Résumé - Persistance et fonctions de racines de souches de Pinus contorta présentant des anastomoses avec des arbres vivants. En Alberta Canada de couples d arbres Pinus contorta présentant des anastomoses racinaires ont été sélectionnés pour étudier la longévité et la disposition des racines de souches connectées à des arbres vivants et préciser l impact des ces racines résiduelles sur la croissance en diamètre de l arbre vivant. Dans une seconde étude des bosquets denses d arbres anastomosés ont été éclaircis manuellement et les arbres conservés ont été coupés après deux saisons de végétation.
