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vol.26 número1STUDYING THE GRAMMAGE IN LVL PANELS GLUED WITH CASTOR OIL-BASED POLYURETHANE ADHESIVE: A POSSIBLE ALTERNATIVE TO FORMALDEHYDE RELEASING ADHESIVES. índice de autoresíndice de assuntospesquisa de artigos
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CERNE

versão impressa ISSN 0104-7760versão On-line ISSN 2317-6342

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OGANA, Friday Nwabueze; CORRAL-RIVAS, Sacramento  e  GORGOSO-VARELA, Jose Javier. NONLINEAR MIXED-EFFECT HEIGHT-DIAMETER MODEL FOR Pinus pinaster AIT. AND Pinus radiata D. DON. CERNE [online]. 2020, vol.26, n.1, pp.150-161.  Epub 17-Jun-2020. ISSN 2317-6342.  http://dx.doi.org/10.1590/01047760202026012695.

Tree height-diameter (H-D) relationships are important for routine forest assessment. Several H-D relationships have been developed for different species and more are still evolving. This study introduces new H-D model developed for Pinus pinaster and Pinus radiata in Spain, based on data from 184 and 96 permanent sample plots, respectively, collected in the northwest region of the country. Nonlinear mixed-effect modelling technique was used to fit the generalized H-D model. The mixed-effect H-D model was calibrated using the random effects predicted from one to three randomly selected trees per sample plot. Different indices including root mean square error (RMSE) and adjusted coefficient of determination () were used to assess the predictive performance of the model. The results showed that the new model had and RMSE of 0.906 and 1.156 m and 0.814 and 1.703 m for P. pinaster and P. radiata, respectively. The calibration response involved the selection of one tree per sample plot and resulted in a reduction of RMSE by 6.5% and 13.5% for pinaster and P. radiata, respectively.

Palavras-chave : Hossfeld IV; Fixed-effect; Model calibration; Maritime pine; Monterrey pine.

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