An assessment of volume-ratio functions for <i>Eucalyptus</i> <i>globulus</i> and <i>E</i>. <i>nitens</i> in Chile

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dc.contributor.authorGilabert, Horacio
dc.contributor.authorPaci, Carlos
dc.date.accessioned2025-01-21T00:07:11Z
dc.date.available2025-01-21T00:07:11Z
dc.date.issued2010
dc.description.abstractH. Gilabert, and C. Paci. 2010. An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile. Cien. Inv. Agr. 37(1):5-15. Volume-ratio and total volume models for Eucalyptus nitens and E. globulus grown in southern Chile were fitted independently. The validation process considered the bias and the total error in the volume estimates, as well as the age classes close to thinning and harvesting operations. Volume estimates from the system of functions (volume and ratio) were compared to the volume estimates from a taper function (Bruce model) to estimate the volume at different top stem diameters. The results indicated that general (as opposed to local) logarithmic functions performed better in their estimation of the total volume for both species, while a unique polynomial model was the best model for the ratio estimates for both Eucalyptus species. The system of functions (total volume + ratio models) was an unbiased estimator for a top stem diameter of 5 and 10 cm for E. nitens, and was a slightly biased estimator for E. globulus. Estimates of the volume of top stems with 18 cm diameters had a large bias and a large total error for both species. These total errors were generally related to errors in the total volume function rather than to errors in the ratio estimates. When the volume estimates were compared with estimates from a taper function, the volumne-ratio system performed better for E. nit ens while the taper function performed better for E. globulus.
dc.fuente.origenWOS
dc.identifier.issn0718-1620
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95619
dc.identifier.wosidWOS:000277157200001
dc.issue.numero1
dc.language.isoen
dc.pagina.final15
dc.pagina.inicio5
dc.revistaCiencia e investigacion agraria
dc.rightsacceso restringido
dc.subjectEucalyptus
dc.subjectmodels
dc.subjecttimber products estimates
dc.subjectvolume-ratio functions
dc.subject.ods13 Climate Action
dc.subject.ods15 Life on Land
dc.subject.odspa13 Acción por el clima
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleAn assessment of volume-ratio functions for <i>Eucalyptus</i> <i>globulus</i> and <i>E</i>. <i>nitens</i> in Chile
dc.typeartículo
dc.volumen37
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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