Current issue: 58(5)

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Silva Fennica 1926-1997
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Articles by Nelson Thiffault

Category : Research article

article id 23029, category Research article
Amira Fetouab, Nicole J. Fenton, Nelson Thiffault, Martin Barrette. (2024). Planting density and mechanical site preparation effects on understory composition, functional diversity and planted black spruce growth in boreal forests. Silva Fennica vol. 58 no. 2 article id 23029. https://doi.org/10.14214/sf.23029
Keywords: silviculture; paludification; reforestation; plantation establishment; community ecology; functional ecology
Highlights: Mechanical site preparation and planting density interacted to influence understory diversity and composition in plowed plots; Careful logging alone resulted in higher density of naturally established conifers; Planting density and site preparation alone had no effect on tree height and diameter; Findings provide insights for managing paludified forests and enhancing forest ecosystem functions.
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article id 10375, category Research article
Amy Wotherspoon, Nelson Thiffault, Robert L. Bradley. (2020). Resource availability and physiological response of black spruce to scarification in two climatic regions of Québec (Canada). Silva Fennica vol. 54 no. 4 article id 10375. https://doi.org/10.14214/sf.10375
Keywords: Picea mariana; foliar δ18O; foliar δ13C; needle gas exchange; photosynthetic nitrogen use efficiency; water use efficiency
Highlights: Mechanical scarification of clearcut sites in two climatic regions maintained high growth rates of regenerating black spruce 18 years after treatment; In both regions, scarification reduced soil moisture and increased water use efficiency; In the cooler-humid region, scarification improved soil nitrogen mineralization.
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article id 10230, category Research article
Mohammed Henneb, Osvaldo Valeria, Nelson Thiffault, Nicole Fenton. (2019). Black spruce seedling growth response in controlled organic and organic-mineral substrates. Silva Fennica vol. 53 no. 4 article id 10230. https://doi.org/10.14214/sf.10230
Keywords: Picea mariana; paludification; seedling growth; seedling nutrition; semi-controlled experiment; substrate
Highlights: Seedling height and diameter were highest on clay and mesic substrates respectively; Foliar nutrients were relatively high in seedlings that were established on mesic substrates; We recommend the application of mechanical soil preparation techniques that promote the creation of organic-mesic substrates to support regeneration establishment.
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article id 10209, category Research article
Claudie-Maude Canuel, Nelson Thiffault, Michael K. Hoepting, James C.G. Farrell. (2019). Legacy effects of precommercial thinning on the natural regeneration of next rotation balsam fir stands in eastern Canada. Silva Fennica vol. 53 no. 4 article id 10209. https://doi.org/10.14214/sf.10209
Keywords: silviculture; Abies balsamea; PCT; conifer; density management
Highlights: We investigated the potential legacy effects of precommercial thinning in next rotation, dense natural balsam fir stands; Precommercial thinning had few legacy effects on next rotation stands and should not impair their regeneration; Balsam fir dominated the regeneration layer. Other tree species were almost absent.
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article id 918, category Research article
Nelson Thiffault, François Hébert, Robert Jobidon. (2012). Planted Picea mariana growth and nutrition as influenced by silviculture x nursery interactions on an ericaceous-dominated site. Silva Fennica vol. 46 no. 5 article id 918. https://doi.org/10.14214/sf.918
Keywords: fertilization; black spruce; scarification; Kalmia angustifolia; Rhododendron groenlandicum; stock type
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Category : Research note

article id 1716, category Research note
Nelson Thiffault, Alain Paquette, Christian Messier. (2017). Early silvicultural guidelines for intensive management of hybrid larch plantations on fertile sub-boreal sites. Silva Fennica vol. 51 no. 2 article id 1716. https://doi.org/10.14214/sf.1716
Keywords: vegetation management; survival; growth; scarification; exotic tree species; intensive silviculture; forest functional zoning (TRIAD)
Highlights: Satisfactory growth can be obtained using a wide range of site preparation intensities; There is a net advantage of performing two motor-manual release treatments over a single release; A second release treatment cannot be replaced by more intensive site preparation; Planting depth had no influence on planted seedling growth after 6 years.
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