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Title: Use of a bark thicknesstree diameter relationship for estimating past diameters of ponderosa pine trees.
Author: Johnson, Floyd A.;
Source: PNW Old Series Research Notes No. 126, p. 1-3
Publication Series: Miscellaneous Publication
Description: Whenever past diameters of ponderosa pine trees are required for growth studies or for other purposes they can be estimated with these formulas:
(1) trees 10 inches and over in diameter at breast height
Dp=Dn - Wg
(1.121) Where Dp=past diameter outside bark 4.5 feet above ground
Dn=present diameter outside bark 4.5 feet above ground
Wg=diameter growth in wood for specified number of years as measured on an increment core.
(2) trees less than 10 inches in diameter at breast height Dp=Dn - Wg
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Johnson, Floyd A. 1956. Use of a bark thicknesstree diameter relationship for estimating past diameters of ponderosa pine trees. PNW Old Series Research Notes No. 126, p. 1-3
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