A carregar...
Publicação
Validation of the method used by the SUBER model for the estimation of extracted cork dry weight with more and less than 9 years of growth
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.15 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
Extraction of cork from montados or cork oak forests is one of the main activities in Portugal. 23% of Portuguese forests are from Quercus suber and Portugal is the main producer of cork in the world. Commonly, every 9 years, but also 10 or more, the cork of the stem and branches with perimeter at breast height greater than 70 cm is removed. Possibly this intervals are not the optimum for the production of cork. Most of the models that exist only predict cork weight for 9 or 10 years of cork age. But a new model developed by Paulo and Tomé (2010) allows the prediction of mature cork biomass with t years of growth, based in one measurement taken at any other age. The model is based on two sub-models; the first one predicts cork biomass with 9 years of age using four alternative models with different variables as inputs; and a second one that estimates cork back weight proportion at 9 years of age. The method has already been validated for 9, 10 and 11 years of cork age, and the objective of this work was doing the validation of the model for that ages and also adding new data of 8 and 13 years of cork age. The evaluation was done by comparing the observed and the estimated values of cork biomass from corks with 8, 9, 10, 11 and 13 years of age. According to previous validation, it was confirmed that the model work better as more input variables are added in the model and it was also found that as the ages of cork biomass move away from 9 years, as well as the extremes of cork thickness classes, the worst is the performance of the model
Descrição
Mestrado MEDFOR - Mediterranean Forestry and Natural Resources Management / Instituto Superior de Agronomia
Palavras-chave
cork biomass Quercus suber allometric models validation bias precision
Contexto Educativo
Citação
Ruiz, M.F. - Validation of the method used by the SUBER model for the estimation of extracted cork dry weight with more and less than 9 years of growth. Lisboa: ISA, 2017, 41 p.