Research Branch

See below to download

The effects of precommercial thinning on the growth and yield of lodgepole pine: 25-year results

Author(s) or contact(s): W.D. Johnstone and F.J. van Thienen
Source: Research Branch
Subject: Growth and Yield, Thinning and Spacing
Series: Extension Note
Other details:  Published 2011. Hardcopy is available.


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.

Download Extension Note 103 PDF file (3712 KB)

To view this document you need the current version of
Adobe Acrobat Reader, available free from the Adobe Web Site.

Updated April 12, 2011