| Title: | A site model for Pyrenean oak (Quercus pyrenaica) stands using a dynamic algebraic difference equation. |
| Authors: | Carvalho, J.P.
Parresol, B.R.
USDA, FS |
| Source: | Canadian journal of forest research. 2005 Jan., v. 35, no. 1, p. 93-99. |
| NALT Subjects: | Quercus pyrenaica
plant growth
forest growth
forest stands
simulation models
equations
tree and stand measurements
tree age
forest yields
stand characteristics
height
estimation
Portugal |
| Other Subjects: | site index estimations
site quality
forest growth models
site models |
| Issue Date: | Jan-2005 |
| Abstract: | This paper presents a growth model for dominant-height and site-quality estimations for Pyrenean oak (Quercus pyrenaica Willd.) stands. The Bertalanffy-Richards function is used with the generalized algebraic difference approach to derive a dynamic site equation. This allows dominant-height and site-index estimations in a compatible way, using any desirable base age and allowing estimations to be time independent, which are important properties for site models. The database contains all possible height-growth intervals. The model is fitted considering residual autocorrelation, giving more efficient parameter estimates. Finally, the model behavior is analyzed by calculating error statistics from dominant-height and site-index estimations at different ages. |
| URI: | http://hdl.handle.net/10113/1236 |
| Appears in Collections: | USDA Research and Information
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