Effects of overtopping on growth of white spruce in Alaska Public Deposited

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  • Early establishment of competing vegetation often presents an obstacle to the success of planted white spruce (Picea glauca (Moench) Voss) seedlings. We followed growth and development of white spruce and associated vegetation for up to 17 years in Alaska's boreal forests to quantify roles of overtopping plant cover in suppressing conifers. The three study areas represented a range of site conditions of varying productivity and species of competing cover, different site preparation and release treatments, and different bare-root and container white spruce stock types. Herbaceous overtopping peaked early after planting and decreased as white spruce were able to outgrow competitors. Overtopping by shrubs and hardwoods, especially aspen (Populus tremuloides Michx.) and resin birch (Betula neoalaskana Sarg.) peaked somewhat later than herbaceous overtopping and decreased over time for most sites and treatments. In a model that combined all sites, vegetation management treatments, and years, overtopping and previous year's volume explained approximately 85% of the variation in volume growth. Increasing the size of planting stock helped reduce overtopping, hence suppression, even in treatments dominated by hardwood species. Results suggested that control of overtopping was essential for maximum growth and long-term or increasing levels of overtopping severely suppressed white spruce seedling growth.
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  • Cole, E., Newton, M., & Youngblood, A. (2013). Effects of overtopping on growth of white spruce in alaska. Canadian Journal of Forest Research, 43(9), 861-871. doi:10.1139/cjfr-2013-0117
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  • description.provenance : Made available in DSpace on 2013-10-14T17:07:02Z (GMT). No. of bitstreams: 1 ColeECForestEngineeringResourcesManagementEffectsOvertoppingGrowth.pdf: 503342 bytes, checksum: b987c1523151082d0b008a1663241914 (MD5) Previous issue date: 2013-09
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2013-10-14T17:05:50Z No. of bitstreams: 1 ColeECForestEngineeringResourcesManagementEffectsOvertoppingGrowth.pdf: 503342 bytes, checksum: b987c1523151082d0b008a1663241914 (MD5)
  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-10-14T17:07:02Z (GMT) No. of bitstreams: 1 ColeECForestEngineeringResourcesManagementEffectsOvertoppingGrowth.pdf: 503342 bytes, checksum: b987c1523151082d0b008a1663241914 (MD5)

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