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Effects of contemporary winter seismic exploration on low arctic plant communities and permafrost
Download2009
Kemper, J. T., MacDonald, S. E.
Abstract: We studied effects of oil and gas exploration, using the most recent seismic exploration technologies, on tundra plant communities and soils in four vegetation types in the Low Arctic of western Canada, two to three years post-disturbance. For all four vegetation types, seismic lines...
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Effects of recreational traffic on alpine plant communities in the northern Canadian Rockies
Download2012
MacDonald, S. E., Crisfield, V., Gould, J.
Abstract: Recreational activities in alpine areas have been increasing in recent decades, creating the need to improve our understanding of the impacts of these activities and how they are best managed. We explored impacts of recreational trail use on dry alpine meadows in the northern Canadian...
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Factors influencing size inequality in peatland black spruce and tamarack: Evidence from post-drainage release growth
Download1999
1 We used tree ring analysis to determine stem radius and thus examine size variation over time in two even-aged (approximately 40-year-old) mixed populations of black spruce and tamarack established on peatlands in a boreal forest. We also followed the response of one of these populations to...
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Quantifying distance of edge influence: A comparison of methods and a new randomization method
Download2011
Abstract. Despite many studies on edge influence in forests, there is no common method for estimating distance of edge influence (DEI, ¼ edge width). We introduce a new randomization method (RTEI) for estimating DEI that tests the significance of edge influence compared to the reference forest....
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Structure and composition of riparian boreal forest: new methods for analyzing edge influence
Download2001
Abstract: Riparian ecotones at lakeshore edges are prominent features on the heterogeneous boreal forest landscape. We introduce a new method (the critical values approach): which incorporates inherent variability in interior forest, to quantify distance of edge influence at lakeshore forest...
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2005
Dale, M. R. T., MacDonald, S. E., Peters, V. S.
Abstract: We used the mast-seeding tree Picea glauca (white spruce) to examine whether the timing of mast years relative to fire had a lasting effect on the density and timing of regeneration. We studied 17 fires that occurred in mast years and in years with low cone production between 1941 and...
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2002
Purdy, B. G., Dale, M. R. T., MacDonald, S. E.
Abstract: Early establishment of white spruce (Picea glauca) in mixedwood boreal forest stands following fire was examined at several times-since-fire (1-, 2-, 4-, 6-, 14-years). Abiotic and biotic conditions in the stands were assessed at two scales, tree plot (5 in x 5 in) and microsite (1 m x...
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The Restorative Imperative: Challenges, objectives and approaches to restoring naturalness in forests
Download2011
Burton, P. J., MacDonald, S. E.
Abstract: Many of the world's forests are not primeval; forest restoration aims to reverse alterations caused by human use. Forest restoration (including reforestation and forest rehabilitation) is widely researched and practiced around the globe. A review of recent literature reveals some common...