Canadian Forest Service Publications
Amounts of logging residues affect planting microsites: A manipulative study across northern forest ecosystems. 2014. Trottier-Picard, A.; Thiffault, E.; DesRochers, A.; Paré, D.; Thiffault, N.; Messier, C. For. Ecol. Manag. 312:203-215.
Available from: Laurentian Forestry Centre
Catalog ID: 35240
CFS Availability: PDF (request by e-mail)
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We quantified the effects of different loads of forest logging residues on the microenvironment (soil temperature, soil volumetric water content, competing vegetation cover, and available nutrients) of planted hybrid poplars one year after planting, and assessed the corresponding seedling growth until the third growing season. In four experimental plantations across Quebec (Canada), we used a factorial design of four residue loads that were applied at the tree-level over three planted species: hybrid poplars (Populus spp.), black spruce (Picea mariana (Mill.) BSP), and either jack pine (Pinus banksiana Lamb.) or white spruce (Picea glauca (Moench) Voss), depending upon the site. Logging residues linearly decreased competing vegetation cover on two of four sites and reduced fluctuations in soil temperature on all sites. Logging residues also decreased summer soil temperatures at all sites through a negative quadratic effect. On one site, the frequency of freeze–thaw cycles increased under logging residues, while logging residues increased soil water content on another site, for certain measurement events. Logging residues did not affect available nutrients. Seedlings showed no consistent growth response to logging residues for three years after planting, except for a beneficial effect of logging residues on hybrid poplar growth on one site. Because logging residues affected seedling microclimate and competing vegetation, their maintenance and on-site spatial arrangement on site could be used to manipulate the growing conditions for planted trees.
Plain Language Summary
The use of logging residues (tree branches, crowns) for biomass has been the subject of increasing interest over the last 10 years. Several studies have compared the ecological impacts of whole-tree versus stem-only harvesting. However, few studies have been done on the quantitative effect of the presence of residues on ecosystems, which would help to establish residue retention targets depending on site characteristics. This study aims to answer the following question: how much logging residue can be harvested without harming stand productivity?
To answer this question, researchers studied four sites located across Quebec to determine the effect of increasing amounts of residue left on the ground in the first years after establishment of a stand, for various species with contrasting physiologies (hybrid poplar, jack pine, white spruce, black spruce). They found that the amount of residue on the ground affects soil temperature and the density of competing vegetation. However, no effect on plant growth was found.
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