Modelling cork oak production in Portugal |
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Authors: | M C Ferreira A M Carvalho Oliveira |
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Institution: | 1. Direc??o Geral das Florestas, Lisboa, Portugal 2. Departamento de Engenharia Florestal, Tapada da Ajuda, 1399, Lisboa codex, Portugal
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Abstract: | The layout of 32 permanent plots in the most important cork production regions of Portugal and the measurement of the most
representative tree parameters were performed for statistically sound cork weight modelling. The establishment of cork weight
equations is presented for the different cork oak study areas considered alone or grouped according to the most representative
tree parameters. For the presented cork weight models was chosen independent variable the total stripping surface (artmax). For the selection criteria five statistic were used, including PRESS, APRESS and Mallows's statistic. The crossvalidation
of the best classified models was performed and to discuss the importance of the “study area” factor, a regression analysis
with “dummy” variables was performed. |
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Keywords: | Quercus suber cork weight models validation |
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