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The Facts Behind Improvement Selection

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Periodic measurements on a cutover area of ponderosa pine in the Fort Valley Experimental Forest show the performance of some 8,000 individual trees under different conditions over periods of from 15 to 30 years. When the trees are examined singly, the growth rate bears no consistent relation to "age-and-vigor" classes but is closely related to ground space as indicated by position in the stand. These findings form the basis of marking practice under the method of improvement selection, described in an earlier article. The present article gives these findings in greater detail and discusses their application to marking practice in tree groups representing three distinct age classes.

Document Type: Journal Article

Affiliations: Senior Silviculturist, Southwestern Forest and Range Experiment Station, maintained by the Forest Service, U. S. Department of Agriculture, for Arizona, New Mexico, and west Texas

Publication date: October 1, 1943

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    2015 Impact Factor: 1.476
    Ranking: 22 of 66 in forestry

    Also published by SAF:
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