Base-Age Invariant Polymorphic Site Curves
Polymorphic curves fitted by techniques in which site index is a predictor variable are specific to a preselected base age. A new approach eliminates this problem and the need to quantify site quality with the data before estimating parameters. Height-over-age curves for Pinus radiata D. Don in New Zealand are produced with linear least-squares estimation. Forest Sci. 20:155-159.
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