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Crop-tree Thinning of Western Larch (EP 511)


To determine the effects of tree size and post-thinning density on the growth and development of thinned western larch crop trees.


In this single-tree experiment, 20 trees within each of six diameter classes were selected at the time of trial establishment (120 trees in total). Each of three crop-tree thinning treatments (removal of all competing vegetation to a radii of 2.4, 3.6, and 4.8 m around each selected tree) plus an unthinned treatment were randomly assigned to five trees within each diameter class.

The study was established in 1958 in a 31-year-old, fire-origin mixed stand of western larch, Douglas-fir and lodgepole pine within the IDFdm2 biogeoclimatic subzone northwest of Cranbrook. The installation was re-measured on about a 5-year cycle until 1998, when it was switched to a 10-year re-measurement interval.


Thompson, C.F. 1992. Crop-tree thinning of western larch in southeastern British Columbia: 30-year results. B.C. Ministry of Forests, Victoria. Research Note No. 110.

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Last Modified: 2007 APR 20.  Ministry contact: Frank van Thienen