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Roland, Carl

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The National Park Service (NPS) approved the use of Calcium Chloride as a dust suppressant on the Park road after four years of research. A formal monitoring program to track the spatial and temporal movement of CaCl2 concentrations along the Park road began in 2005. Fifteen terrestrial sites and fourteen water body locations were selected to monitor the movement of chloride from the roadbed into roadside soils and surface waters. Initial results showed wide variability in chloride concentrations in soil adjacent to the roadbed, while waterbodies generally had low concentrations (ABR 2006). This report presents 2007 results for the dust palliative chloride monitoring program.During the summer of 2007, 35 applications...
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Snowmachine use in Alaska has increased substantially during the previous decade. In addition, innovations in the design and performance of these vehicles has allowed riders to travel farther and faster per hour of riding time than was possible in the past. These design innovations have resulted in the elimination of de facto natural barriers (i.e. steep terrain) to snowmachine access. A potential consequence of this trend in use and these technological changes is increased impacts on the resources of Denali National Park and Preserve, including harm to the vegetation resources.
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We examined the phenology, or the timing of biological events, in aspen trees in interior Alaska. Specifically, we observed the dates of leaf out, flowering and fall senescence in aspen in plots in parks within the Central Alaska Network. We first examined six years of aspen phenology observations taken from two very different areas (one a steep, dry, south-facing area and one a flat, mesic area) within Denali National Park. We then compared the phenology of aspen from similar habitats (both flat and mesic) in different parks: Denali National Park and Wrangell St. Elias National Park. We made correlations between climate variables and phenology benchmarks. We also investigated differences in flowering and bud burst...
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