New Zealand Journal of Botany abstracts

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BASAL AREAS AS DETERMINED BY THE POINT-CENTRED QUARTER METHOD

D.A Frankiln

Forest and Range Experiment Stn, N.Z. Forest Service, Rangiora Abstract s shown below, the point-centred quarter method described by Cottam and Curtis (1956) has been found consistently to measure trees whose average diameter is larger than that of the stand when there is a fair range of size classes present. If the area bounded by the right bisectors of the straight lines joining the centre of a tree to each of its neighbours is called the area potentially available (a.p.a.) of that tree (Brown, 1964), then by definition that tree will be the closest tree to any point within its a.p.a. Measurements of stands containing a range of size classes show that small trees tend to have smaller a.p.a.'s than large trees, even where there is no noticeable grouping of small trees.

N.Z. Jl Bot 5: 168-9 Received 2 July 1966

PDF file of entire paper: medium quality (90K); (scanned from paper original: notes about this process)

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