Summary
Explains how seedlings grow into mature trees and how stands of trees develop. Describes basic tree growth and growth processes (photosynthesis, respiration, and translocation-assimilation). Discusses how thinning affects individual tree growth and stand growth, including growth responses, thinning shock, tolerance levels of common Pacific Northwest tree species, crown classification systems, and stand yields. Recommends six objectives for a good thinning plan and provides suggestions on timing, thinning intensity, species and tree selection, and logging methods. Includes illustrations of the kinds of wood that make up a tree, cross-sections of trees properly and improperly thinned, and the relationship of crown class to tree height and age.
© 1983 Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the Oregon State University Extension Service, Washington State University Extension, University of Idaho Extension and the U.S. Department of Agriculture cooperating. The three participating Extension services offer educational programs, activities and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/ parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)