Canadian Forest Service Publications

Managing plantation density through initial spacing and commercial thinning: Yield results from a 60-year-old red pine experiment. 2021. Thiffault, N.; Hoepting, M.; Fera, F.; Lussier, J.-M.; Larocque, G.R.; Canadian Journal of Forest Research. 51(2): 181-189

Year: 2021

Issued by: Canadian Wood Fibre Centre

Catalog ID: 40322

Language: English

Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.1139/cjfr-2020-0246

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We report on a 60-year-old red pine (Pinus resinosa Aiton) spacing trial experiment located in Ontario, Canada, that included the combinations between six initial spacings (from 1.2 to 3.0 m) and the presence or absence of a commercial thinning (CT) regime, as well as their impacts on quadratic mean diameter (QMD) and stand volume yield. The CT regime, initiated at age 30, targeted a residual basal area (BA) of 38 m2·ha1 after each of four entries.Without thinning, as initial spacing increased, QMD increased; gross and net volume production peaked in the 2.1–2.4 m spacings. With thinning, similar trends with spacing were evident for QMD, although piece sizes were larger and differences between spacings were lower. The immediate increase ofmean tree size caused by tree selection explained most of the differences in QMD between thinned and unthinned plots. Thinning to a common target BA resulted in similar standing volume across spacings. Cumulative gross yield was similar between spacings of