Juvenile Spacing of Amabalis Fr in the Squamish Forest District (EP 1211)

Objectives:

1. To determine the effects of different spacing treatments on the growth and yield of amabalis fir/western hemlock stands
2. To determine if there is a change in the nutritional status of the amabalis fir and western hemlock after spacing

Treatments

The experiment was established in 1997 at Callaghan Creek near Whistler, B.C. Six levels of pre-commercial thinning (including the non-treated controls) were used to examine the effects of PCT on the growth and yield of amabilis fir and western hemlock. The targeted densities included the operationally prescribed treatment of 800 stems per hectare (sph), a wider range of densities including 500, 1100, 1400 and 1800 sph and an unthinned control; actual post-treatment densities required the treatments to be designated as 550, 800, 950, 1200 and 1600 stems per ha. Four replicates were established for each level of thinning and plot sizes ranged from 0.03ha to 0.10ha.

Status

Active.

Publications 

• de Montigny, L., S. Le Noble, and G. Nigh. 2019. Effects of precommercial thinning after 15 years on growth and yield of western hemlock/amabilis fir stands in coastal British Columbia. Prov. B.C., Victoria, B.C. Tech. Rep. 119. 
• de Montigny, L., P. Asante, S. Le Noble, and G. Nigh. 2019. The economic implications of pre-commercial thinning treatments in mixed western hemlock and amabilis fir stands in coastal British Columbia under varying cost and benefit assumptions and minimum harvest criteria. Prov. B.C., Victoria, B.C. Tech. Rep. 124.