Accuracy of Point Sampling in White Spruce-Aspen Stands of Saskatchewan
Abstract:A test of point sampling was made in spruce-aspen stands of varying ages in Saskatchewan. Basal area values for 272 circular fifth-acre plots, and for point samples (basal area factor 10) established at each plot center, were compared. Point and plot sample basal area estimates for trees larger than 3.5 inches d.b.h. were not significantly different. When all trees larger than 3.5 inches d.b.h. were included in the test, the point sampling estimate of basal area was significantly lower than the plot estimate. This significant difference in underestimating the trees 3.5 inches d.b.h. and smaller is probably attributable to bias in the selection of plot centers. Approximately 50 percent more point samples, with a basal area factor of 10, would be necessary to equal fifth-acre plot accuracy in estimating basal area per acre of trees larger than 3.5 inches d.b.h. Comparisons of frequency distributions as obtained from point and plot sampling in selected strata are also included in this report.
Document Type: Journal Article
Affiliations: Research Officer, Department of Forestry, Forest Research Branch, Calgary, Alberta, Canada
Publication date: 1965-12-01
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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.
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