Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Tsuga heterophylla"”.
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The effect of forest fertilization on the ectomycorrhizae of western hemlock (tsuga heterophylla)
… composed almost exclusively of western hemlock [Tsuga heterophylla (Rafn.)Sarg.], located in the Mount Seymour Demonstration Forest, North Vancouver, British Columbia. Changes in the abundance of 10mycorrhizal types (Cenococcum geophilum Fr., Lactarius scrobiculatus (Scop.) ex. Fr., Mycelium …
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The Role of Fire in Montane Forest Environments in the Willamette National Forest, Oregon
… the dominant vegetation, along with <em>Pseudotsuga </em>and <em>Alnus</em>, suggesting that an open-canopy conifer forest developed soon after the area was glacier free. Fire frequency increased during the early Holocene. Warmer and drier conditions are reflected in the herbaceous vegetation, …
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The influence of salal on planted hemlock and cedar saplings on northern Vancouver Island
… 4-year-old conifer performance (western hemlock (Tsuga heterophylla (Raf.) Sarg.) and western red cedar (Thujaplicata Donn ex D. Don)) and salal (Gaultheria shallon Pursh) leaf area index, and the effect of salal leaf area index on the 2-year growth increment of western red cedar andwestern …
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Spatial and temporal dynamics of fire and vegetation change in Thunder Creek watershed, North Cascades National Park, Washington
… yr BP) Pinus contorta became uncommon and Pseudotsuga menziesii and Pinus monticola were dominant. Shade tolerant species including Thuja plicata and Tsuga heterophylla first appeared at the beginning of the late Holocene (5200 cal yr BP to present). Chamaecyparis nootkatensis appeared most …
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Growth release of trees following fine-scale canopy disturbances in old-growth forests of coastal British Columbia, Canada
… red cedar (Thuja plicata), western hemlock (Tsuga heterophylla), and Pacific silver fir (Abies amabilis). As a first step, I calibrated the radial-growth averaging method to account for regional-scale variability and capture a more complete range of growth releases that may occur following …
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Interacting effects of soil nitrogen supply and light availability on understory sapling growth and foliar attributes
… effects. In partial-cut forests, understory Tsuga heterophylla and Picea glauca x sitchensis had consistent foliar N% across gradients of light availability; in contrast, foliar N% of Betula papyrifera and Thuja plicata declined with increasing shade, which would distort assessments of soil …
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Biological Studies and Evaluation of Scymnus Coniferarum, a Predator of Hemlock Woolly Adelgid from Western North America
The hemlock woolly adelgid (HWA), Adelges tsugae Annand, is an invasive pest of eastern hemlock, Tsuga canadensis (L.) Carriere and Carolina hemlock Tsuga caroliniana Englem. in the eastern United States. A newly reported beetle predator for HWA, Scymnus (Pullus) coniferarum Crotch (Coleoptera: …
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Impact of Gap Size on Environmental Conditions, Survival, and Early Growth of 5 Pacific Northwest Species
… redcedar (Thuja plicata), western hemlock (Tsuga heterophylla), Douglas-fir (Pseudotsuga menziesii), and grand fir (Abies grandis). Western hemlock and western redcedar saw increased growth as vegetation cover increased until full coverage where growth then decreased. Red alder (Alnus …
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Structure and function of western red cedar and western hemlock forests on northern Vancouver Island
… cedar (Thujaplicata Donn) and western hemlock (Tsuga heterophylla (Raf.) Sarge) (the CH type), and a windstorm-derived, second-growth type dominated by western hemlock and amabilis fir (Abies amabilis (Dougl.) Forbes) that largely originated following a widespread windstorm in 1906 (the HA …