Current issue: 56(2)

Under compilation: 56(3)

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Silva Fennica 1926-1997
Acta Forestalia Fennica

Articles by Martin Béland

Category: Research article

article id 10205, category Research article
Michel Soucy, Martin Béland. (2020). A crop tree release variant of precommercial thinning using a backpack mounted chain saw. Silva Fennica vol. 54 no. 3 article id 10205.
Keywords: thinning; hardwood; spacing; time study; brushsaw; motor-manual; work performance
Highlights: Backpack mounted chain saws offer an opportunity to effectively cut larger stems in precommercial thinning treatments compared to conventional circular blade brushsaws; Productivity in performing precommercial crop tree release (PCTR) in a hardwood stand using a backpack mounted chain saw varied between 0.22 to 0.47 ha h–1.
Abstract | Full text in HTML | Full text in PDF | Author Info

Although crop tree release (CTR) in hardwood stands is an accepted variant of precommercial thinning (PCT), the lack of an affordable and feasible method hinders its adoption. CTR implies selecting between 150 and 500 trees ha–1 when trees are between 7 and 12 m high and cutting only stems competing with the target crop trees. We performed a field trial of a CTR variant of PCT in a 27.8 ha hardwood stand using a backpack mounted chain saw. A detailed time study was performed to document the trial over 13 days. Compared to conventional PCT performed earlier in the life of a stand, precommercial crop tree release required cutting larger stems, which showed to be feasible and productive using a backpack mounted chain saw. Productivity varied between 0.22 to 0.47 ha h–1 during the trial, Although productivity could vary with stand characteristics and worker, this proof of concept trial demonstrates some of the potential uses that this new saw configuration offers and sets the basis for an eventual larger scale deployment of this treatment.

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