TAILIEUCHUNG - Báo cáo lâm nghiệp: "Sapwood hydraulic recovery following thinning in lodgepole pine"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Sapwood hydraulic recovery following thinning in lodgepole pine" | Ann. For. Sci. 63 2006 329-338 INRA EDP Sciences 2006 DOI forest 2006013 329 Original article Sapwood hydraulic recovery following thinning in lodgepole pine Douglas Edward Boyd RElDa b Uldis SlLlNSa Victor James LlEFFERSa a Centre for Enhanced Forest Management Department of Renewable Resources University of Alberta 7-51 General Services Building Edmonton Alberta T6G 2H1 b Current address Centre for Northern Forest Ecosystem Research Ontario Ministry of Natural Resources 955 Oliver Rd. Thunder Bay Ontario P7B 5E1 Received 18 March 2005 accepted 8 December 2005 Abstract - Sapflow in lodgepole pine Pinus contorta was measured over the summer of 2002 to assess the impact of reduced sapwood permeability k after thinning on tree water use. Lodgepole pine in recently thinned RT thinned five years prior 5T and un-thinned C stands were instrumented with thermal dissipation sap flow sensors. Daily water use varied considerably L Day-1 but trees in the thinned areas used more water. Despite lower k and leaf specific hydraulic capacity QL in both RT and 5T trees leaf related sapflow rates Ql were generally higher than for C trees. RT trees appeared to experience water stress immediately following thinning in June but by mid August maintained higher Ql and canopy stomatal conductance than both 5T and C trees. Allocation to radial growth following thinning appears to maintain sufficient sapwood area and may offset damage to conducting tissues enabling lodgepole pine trees to tolerate periodic water stress. sapflow hydraulic capacity transpiration thinning lodgepole pine Résumé - Rétablissement hydraulique de l aubier suivant une éclaircie chez Pinus contorta. Le flux de sève a été mesuré chez Pinus contorta pendant l été 2002 afin d estimer l impact de la reduction de perméabilité des tissus de l aubier k sur l utilisation de l eau par l arbre après éclaircie. Des détecteurs de dissipation thermique destinés à mesurer le flux de sève ont été installés sur .

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