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    Author(s): Richard M. Teck; Donald E. Hilt; Donald E. Hilt
    Date: 1991
    Source: Res. Pap. NE-649. Radnor, PA: US. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 11 p
    Publication Series: Research Paper (RP)
    Station: Northeastern Research Station
    PDF: View PDF  (1.19 MB)

    Description

    Describes a distance-independent individual-tree diameter growth model for the Northeastern United States. Diameter growth is predicted in two steps using a two parameter, sigmoidal growth function modified by a one parameter exponential decay function with species-specific coefficients. Coefficients are presented for 28 species groups. The model accounts for variability in annual diameter growth due to species, tree size, site quality, and the tree's competitive position within the stand. Model performance is evaluated using the mean predicted error and the root mean square error. Results are presented for the calibration data and an independent validation data set. The model has been incorporated into NE-WIGS, a computerized forest growth model for the Northeastern United States.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Teck, Richard M.; Hilt, Donald E. 1991. Individual tree-diameter growth model for the Northeastern United States. Res. Pap. NE-649. Radnor, PA: US. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 11 p

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    Keywords

    NE-TWIGS, diameter growth prediction, computer simulation, basal-area growth

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