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Inhibiting Effect of Ponderosa Pine Seed Trees on Seedling Growth

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Abstract:

Ponderosa pine seed trees, numbering 4, 8, and 12 per acre, were left standing for 9 years after harvest cutting on the Challenge Experimental Forest, Calif. Seedling heights were measured at ages 5, 9, and 14, and for all ages were poorest if within 20 feet of a seed tree. Seedlings 20 feet or less from a seed tree at the ages given lost the equivalent in years of height growth: 5(4.1); 9(6.8); 13(10.6). Seed-tree density greatly affected seedling height--the greater the density, the poorer the height growth. The inhibitory effect of the seed trees extended outward at least 40 feet, and persisted 4 years after their removal.

Document Type: Journal Article

Affiliations: Research Forester, Pacific Southwest Forest and Range Experiment Station, USDA Forest Service, Redding, California

Publication date: April 1, 1976

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.
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