Early Lessons from Commercial Thinning in a 30-Year-Old Sitka Spruce-Western Hemlock Forest

摘要

A commercial thinning study was undertaken in a 30-year-old stand, precommercially thinned at 15 years of age, at Cascade Head Experimental Forest on the Oregon coast. Measurements obtained after three different thinning treatments are presented and include stand volume, basal area, current growth rate, scar damage, crown ratio, and sapwood radius. Method of establishing plots is given, and stand conditions before and after thinning are described.