TAILIEUCHUNG - Báo cáo lâm nghiệp:" Effects of competing vegetation on juvenile white spruce (Picea glauca (Moench) Voss) growth in Alaska"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Effects of competing vegetation on juvenile white spruce (Picea glauca (Moench) Voss) growth in Alaska" | Ann. For. Sci. 60 2003 573-583 INRA EDP Sciences 2004 DOI forest 2003049 573 Original article Effects of competing vegetation on juvenile white spruce Picea glauca Moench Voss growth in Alaska Elizabeth COLEa Andrew YOUNGBLOODb Michael NEWTONa a Department of Forest Science Oregon State University Corvallis OR USA b USDA Forest Service Pacific Northwest Research Station LaGrande OR USA Received 24 June 2002 accepted 10 February 2003 Abstract - We examined the impacts of competing vegetation on survival and juvenile growth of white spruce Picea glauca Moench Voss on 3 units in south-central Alaska and on 3 units in interior Alaska. Treatments consisted of herbicide site preparation and release treatments and also included a treatment in which competition was minimized for 5 years weed-free treatment . At all units the weed-free treatment resulted in significant increases in white spruce height and basal diameter by ages 10 or 11 compared to untreated plots. Average heights and diameters in the weed-free treatments were to times and to times those in the untreated plots respectively. Results from the other treatments differed by unit based on the efficacy of a particular treatment on the vegetation at that unit. For all units regression equations indicated a significant decrease in diameter at year 10 or 11 with increasing competitive cover and overtopping. vegetation management competition Picea glauca Alaska survival Résumé - Effects de la végétation concurrente sur la croissance juvénile de Picea glauca Moench Voss en Alaska. Nous avons étudié les effets de la végétation concurrente sur la survie et la croissance de Picea glauca Moench Voss dans 3 dispositifs situés au centre sud de l Alaska ainsi que 3 dispositifs installés dans l Alaska intérieur. Il s agissait de traitement de preparation des sites et de dégagements par application d herbicides. L un des traitements consistait à contrôler la végétation pendant 5 ans traitement éliminant

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