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Point Sampling for Forest Growth Estimation

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Point samples with a basal area factor of ten are compared with standard 1/5-acre plots for basal area growth over various time periods. The ongrowth tree is defined as the tree which does not qualify for the point sample on the initial measurement but which both qualifies and is above minimum d.b.h. on the next measurement. Three different computational techniques are considered for this tree. The first considers growth on this tree equal to zero; the second includes growth on the tree since the time it qualified as being in the sample; the third includes the terminal basal area of the ongrowth as part of ingrowth. Use of the first two techniques did not cause significant differences between the plot and point sample estimates of ingrowth; but the technique of incorporating the basal area of the ongrowth tree with the ingrowth estimate resulted in significant differences. Procedures and formulae are given for computing growth estimates from permanent sample points.
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Document Type: Journal Article

Affiliations: Associate Professor of Forestry, Purdue University, W. Lafayette, Ind.

Publication date: 1968-12-01

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  • 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.

    2016 Impact Factor: 1.675 (Rank 20/64 in forestry)

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    June 1, 2016 to Feb. 28, 2017

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