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Height-Diameter and Height-Diameter-Age Equations For Second-Growth Douglas-Fir

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A number of height-diameter and height-diameter-age equations were compared for second-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Most gave similar results within the range of the data. Some appeared undesirable because of unreasonable curve shapes when extrapolated. For remeasured plots, use of a single height-diameter-age equation for each plot rather than individual height-diameter curves for each measurement will give more accurate and more consistent estimates of volume, periodic increment, and site index. A number of suitable equation forms are suggested.
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Document Type: Journal Article

Affiliations: Mensurationist, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U.S. Dept. of Agric., Portland, Oreg.

Publication date: 01 December 1967

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