Southern Research Station

Title: A Volume and Taper Prediction System for Bald Cypress

Author: Parresol, Bernard R.; Hotvedt, James E.; Cao, Quang V.

Date: 1987

Source: Can. J. For. Res. 17: 250-259

Description: A volume and taper prediction system based on d₁₀ and consisting of a total volume equation, two volume ratio equations (one for diameter limits, the other for height limits), and a taper equation was developed for bald cypress using sample tree data collected in Louisiana. Normal diameter (d_n), a subjective variable-height measure applied to bald cypress (Taxodium distichum (L.) Rich.) in place of diameter at breast height (dbh), was found to be inferior to five different fixed-height diameter measurement points in terms of predicting total volume. Diameter measured at 10 ft (3.0 m) above the ground, termed d₁₀ is recommended as a better diameter measurement point for bald cypress. A number of "goodness-of-fit" statistics were employed to evaluate alternative functions for predicting volume and taper. Two statistics, bias and sum of squared relative residuals, provided the best discrimination between functions.

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Citation

Parresol, Bernard R.; Hotvedt, James E.; Cao, Quang V.  1987.  A Volume and Taper Prediction System for Bald Cypress.   Can. J. For. Res. 17: 250-259