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Showing 1 to 20 of 28 for “"Pinus contorta"”.
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Stafafura (Pinus contorta) í Norðtunguskógi. Fræ: dreifing-magn-spírun
… yfir 80 ár frá því að fyrstu stafafuru-fræin (Pinus contorta) voru flutt inn til Íslands frá Norður Ameríku og fyrstu plönturnar voru ræktaðar og gróðursettar hér á landi. Komið hefur í ljós að stafafura, einkum af kvæminu Skagway, er vel aðlöguð að aðstæðum hér á landi og lifir og vex almennt …
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Population differences in water-use effeciency for Pinus contorta dougl as indicated by stable carbon isotopic composition
… to test genetic and environmental responses of Pinus contorta Dougl. populations to moisture gradients. To gain insight into patterns of natural selection for high or low WUE, trends in 8¹³C were measured in genotypes from different habitats. Correlations between 8¹³C and productivity were …
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Hydrologic significance of stand density variations in Alberta lodgepole pine (Pinus contorta Dougl. (Moench) Voss. var. latifolia Engelm.) forests
With twin objectives of (1) determining whether any hydrologic effect of thinning persisted 25 years after implementation, and (2) examining the hydrologic significance (if any) of variations in stand density, studies of snow accumulation, canopy interception of rainfall, and soil moisture, were …
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Management decision-making tools for mountain pine beetle (Dendroctonus ponderosae) (Coleoptera: Scolytidae) populations in lodgepole pine (Pinus contorta) stands
To prevent the buildup of epidemic level mountain pine beetle populations, conditions of the stand environment they inhabit must be altered. Silvicultural treatment is the most effective means for doing this. Preventative treatments work best when applied while mountain pine beetle populations are …
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Shrinkage characteristics of lodgepole pine
… two North American varieties of lodgepole pine: Pinus contorta var. latifolia and Pinus contorta var. murrayana, sampled at 10% of tree height. For var. murrayana, size was the only factor that had a significant effect on specific gravity; specific gravity decreased with increasing tree diameter. …
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An assessment of stingless beeswax as a pattern material in ancient Mesoamerican lost-wax casting
… copals: Bursera copallifera, Protium copal, and Pinus contorta. Thermal data from Differential Scanning Calorimetry revealed no changes in thermal behavior between waxes and their blends with copals, showing that none of the blends considered in this study are miscible. However, hardness testing …
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Spatial and temporal dynamics of fire and vegetation change in Thunder Creek watershed, North Cascades National Park, Washington
… forests were likely open grown and dominated by Pinus contorta. During the mid Holocene (c. 7700 to c. 5200 cal 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 …
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Assessment of Prediction Bias in Crown Biomass Equations for Important Conifer Species of the Inland Northwest
… over-predict the crown mass of ponderosa pine (Pinus ponderosa) and western larch (Larix occidentalis), and under-predict the crown mass of Douglas-fir (Pseudotsuga menziesii) and lodgepole pine (Pinus contorta). Further, it was found that the magnitude of the bias increased with diameter at …
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Assessment of Prediction Bias in Crown Biomass Equations for Important Conifer Species of the Inland Northwest
… over-predict the crown mass of ponderosa pine (Pinus ponderosa) and western larch (Larix occidentalis), and under-predict the crown mass of Douglas-fir (Pseudotsuga menziesii) and lodgepole pine (Pinus contorta). Further, it was found that the magnitude of the bias increased with diameter at …
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Effect of tree mortality on biogeochemical response after mountain pine beetle forest infestation, The
… between healthy and deceased lodgepole pines (Pinus contorta) surrounded by varying extents of tree mortality. Bark beetle impact altered N cycling, as an increased proportion of the total N pool was inorganic ammonium, as opposed to more stable and less mobile organic N, which dominates in …
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Longitudinal air permeability of lodgepole pine
… representing two varieties of lodgepole pine (Pinus contorta, vars. latifolia and murrayana) were measured with a steady state apparatus. It was found that the mean ratio of sapwood to heartwood permeability was ca. 10:1 for both varieties. The mean ratio of var. latifolia to murrayana was …
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An assessment of the representation of fire severity and coarse woody debris dynamics in an ecosystem management model
… role in the dynamics of lodgepole pine (Pinus contorta ssp. latifolia Engelm.ex S.Wats.) dominated forests. Fire severity is a controversial term that usually refers to a qualitative measure of the fire effects on soil and vegetation and ultimately on ecosystem sustainability. The main …
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A Dendroclimatic Investigation of Southwestern Saskatchewan
… moisture sensitive tree-ring chronologies (Pinus albicaulis, Pinus ponderosa, Pinus contorta, Picea glauca, and Pseudotsuga menziesii) were collected and updated from the Sweet Grass Hills and Bears Paw Mountains (Montana, USA), and the Cypress Hills (Alberta and Saskatchewan, Canada). …
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Performance Assessment and Evaluation of Hydrophobic and Ultraviolet Protective Treatments for Historic Log Structures
… chosen for testing on samples of lodgepole pine (Pinus contorta latifolia), a common building material in the area, obtained from a supplier in the region. Samples were monitored every 100 hours to observe surface degradation and were then evaluated pre- and post-weathering using microscopic …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
… ponderosae) has expanded from lower elevation Pinus contorta (lodgepole pine) forests into high elevation Pinus albicaulis (whitebark pine), a presumed superior host. I investigated whether stored resources in tree sapwood change after D. ponderosae attack, and whether this change relates to …
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Effects of host stored resources on bark beetle-fungal-conifer interactions
… ponderosae) has expanded from lower elevation Pinus contorta (lodgepole pine) forests into high elevation Pinus albicaulis (whitebark pine), a presumed superior host. I investigated whether stored resources in tree sapwood change after D. ponderosae attack, and whether this change relates to …
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Biological Studies and Evaluation of Scymnus Coniferarum, a Predator of Hemlock Woolly Adelgid from Western North America
… Pseudotusga menziesii Mirb., Shore pine, Pinus contorta Dougl., western white pine, Pinus monticola Dougl., and western hemlock, Tsuga heterophylla (Raf.) Sarg. host tree species were sampled in Tacoma, Washington to investigate the life history of S. coniferarum and associated adelgid …
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