Journal
CANADIAN JOURNAL OF FOREST RESEARCH
Volume 34, Issue 2, Pages 431-446Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/X03-144
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The SAFE (sylviculture et amenagement forestiers ecosystemique) project was set up in 1998 in the Lake Duparquet Research and Teaching Forest to test stand-level silvicultural treatments designed to reflect different aspects of natural forest dynamics. In the winter of 1998-1999, four levels of forest harvesting, including a no-harvest and a clearcut treatment, were applied to even-aged trembling aspen (Populus tremuloides Michx.) stands according to a complete block design with three replications. Two partial cut treatments removed 33% and 61% of the stand basal area. During the first growing season, harvesting induced a large increase in indigenous understorey biomass that paralleled changes in the canopy opening. Aspen sucker density increased from 4916 stems/ha in the control to 28 751 and 63 333 stems/ha in the one-third and two-thirds harvesting treatments and 102 916 stems/ha in the clearcut. Most changes in nutrient cycling occurred in the second year and included an increase in forest floor organic C, total N, and base cation availability and a decrease in microbial ON ratio. These changes may have occurred in response to reduced vegetation uptake and woody debris abundance.
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