Growth and Mortality of Ponderosa Pine in Relation to Size of Trees and Method of Cutting
Abstract:Three experimental areas of Pinus ponderosa on the Coconino National Forest in Arizona, aggregating 455 acres, were logged by different methods in 1913, leaving volumes of 1,833, 2,846, and 4,510 board feet per acre, respectively. In each case the trees left were selected for physical soundness and capacity for growth and seed production. Increment in board feet over a period of 20 years has been computed by diameter classes and expressed in percent of the original volume of each diameter class. Death losses have been computed in the same manner. Increment percent is highest in the 12-inch class, and declines rapidly as diameter increases; mortality changes in the opposite direction. When plotted on the same scale, the curves of increment and mortality cross each other in the 30-inch class, indicating that in general trees above 30 inches d.b.h. contribute only a net loss to the growth of the stand. This relation is almost identical on the three areas. Net increment per acre is highest on the light-selection cutting area on which the reserved volume was 4,510 board feet, and lowest on scattered-seed-tree cutting where only 1,833 board feet per acre was left.
Document Type: Journal Article
Affiliations: Southwestern Forest and Range Experiment Station
Publication date: April 1, 1940
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