Aspen Bibliography

Accuracy of point sampling in White Spruce-Aspen stands of Saskatchewan

C.L. Kirby

Document Type

Article

Journal/Book Title/Conference

Journal of Forestry

Volume

63

Issue

12

Publisher

Society of American Foresters

First Page

924

Last Page

926

Publication Date

1965

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.

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