The effects of precommercial thinning 56-year-old lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) are reported 25 growing seasons after treatment. Four post-thinning stand densities of 500, 1000, 1500, and 2000 trees per hectare, plus unthinned controls, were established on plots in central British Columbia. Both individual-tree and per-hectare data were analyzed. With the exceptions of mean height and periodic height growth, thinning had a statistically significant effect on all of the characteristics examined. Although this report provides only short-term information on the effects of thinning on the growth and yield of lodgepole pine, it does indicate the need to optimize individual-tree growth rates with levels of growing stock to maximize yield per unit area.
Johnstone, W.D., van Thienen, F.J.. 2011. The effects of precommercial thinning on the growth and yield of lodgepole pine: 25-year results. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Extension Note (FLNRORD). EN103
Topic: FLNRORD Research Program
Keywords: Growth, Yield, Thinning, Spacing
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