An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile
Volume-ratio and total volume models for Eucalyptus nitens and E. globulus grown in southern Chile were ftted 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 estimate...
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| Lenguaje: | English |
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Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
2010
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oai:scielo:S0718-162020100001000012010-06-10An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in ChileGilabert,HoracioPaci,Carlos Eucalyptus models timber products estimates volume-ratio functions Volume-ratio and total volume models for Eucalyptus nitens and E. globulus grown in southern Chile were ftted 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. nitens while the taper function performed better for E. globulus.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.37 n.1 20102010-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100001en10.4067/S0718-16202010000100001 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Eucalyptus models timber products estimates volume-ratio functions |
| spellingShingle |
Eucalyptus models timber products estimates volume-ratio functions Gilabert,Horacio Paci,Carlos An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile |
| description |
Volume-ratio and total volume models for Eucalyptus nitens and E. globulus grown in southern Chile were ftted 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. nitens while the taper function performed better for E. globulus. |
| author |
Gilabert,Horacio Paci,Carlos |
| author_facet |
Gilabert,Horacio Paci,Carlos |
| author_sort |
Gilabert,Horacio |
| title |
An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile |
| title_short |
An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile |
| title_full |
An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile |
| title_fullStr |
An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile |
| title_full_unstemmed |
An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile |
| title_sort |
assessment of volume-ratio functions for eucalyptus globulus and e. nitens in chile |
| publisher |
Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal |
| publishDate |
2010 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100001 |
| work_keys_str_mv |
AT gilaberthoracio anassessmentofvolumeratiofunctionsforeucalyptusglobulusandenitensinchile AT pacicarlos anassessmentofvolumeratiofunctionsforeucalyptusglobulusandenitensinchile AT gilaberthoracio assessmentofvolumeratiofunctionsforeucalyptusglobulusandenitensinchile AT pacicarlos assessmentofvolumeratiofunctionsforeucalyptusglobulusandenitensinchile |
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