An age-independent basal area increment model for maritime pine trees in northwestern Spain

An individual tree basal area increment model for pure stands of maritime pine ( Pinus pinaster Ait.) is presented. The data used to fit the model were collected from 67 temporary 0.05 ha plots installed in regularly stocked, even- and uneven-aged stands located in Galicia (northwestern Spain). Expl...

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Bibliographic Details
Published in:Forest ecology and management 2002-03, Vol.157 (1), p.55-64
Main Authors: Schröder, Jörg, Soalleiro, Roque Rodrı́guez, Alonso, Guillermo Vega
Format: Article
Language:English
Subjects:
Basal area increment
Biological and medical sciences
Dendrometry. Forest inventory
Forestry
Fundamental and applied biological sciences. Psychology
Growth modeling
Pinus pinaster
Pinus pinaster Ait
Simulation
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Summary:An individual tree basal area increment model for pure stands of maritime pine ( Pinus pinaster Ait.) is presented. The data used to fit the model were collected from 67 temporary 0.05 ha plots installed in regularly stocked, even- and uneven-aged stands located in Galicia (northwestern Spain). Explanatory variables used to predict the basal area increment are breast-height diameter outside bark, a diameter-squared term, a distance-independent competition index, crown spread ratio, and effective soil depth. Age and site index are intentionally omitted to obtain generality for a wide range of even- and uneven-aged stand conditions. The resulting model explains more than 78% of the total growth variation, corresponds to current hypotheses about tree growth, and is expected to provide reliable site-specific predictions for most of the pure maritime pine stands found in the study area.
ISSN:0378-1127
1872-7042
DOI:10.1016/S0378-1127(00)00657-5