Comparison of stem taper equations for eight major tree species in the Spanish Plateau

  1. Rodríguez, Francisco
  2. Lizarralde, Iñigo
  3. Bravo, Felipe
Zeitschrift:
Forest systems

ISSN: 2171-5068

Datum der Publikation: 2015

Ausgabe: 24

Nummer: 3

Art: Artikel

DOI: 10.5424/FS/2015243-06229 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Andere Publikationen in: Forest systems

Ziele für nachhaltige Entwicklung

Zusammenfassung

Aim of study: A stem taper function and a compatible merchantable volume system are compared to evaluate which provides a better description of the stem profile for the main species in central Spain.Area of study: This research was carried out in the region of Castile-Leon, located in Central Spain.Material and Methods: A total of 6,357 trees were selected for destructive sampling. All models were fitted using a first-order continuous autoregressive error structure to address the problem of autocorrelation.Main results: In terms of accuracy, the root mean square error (RMSE) in both models ranged from 0.75 to 2.72 depending on the species analyzed, presenting values similar to those reported in other studies. Small differences in the goodness-of-fit for both procedures were also found, and the Stud model provided better accuracy for 6 of the 8 species studied, with RMSE reductions of 0.5% to 8.6%. The RMSE obtained in the cross-validation phase was on average 1.22 times higher than what was obtained in the fitting phase.Research highlights: The non-linear extra sum of squares method indicated that the stem taper differs among the five softwood species and three hardwood species. In hardwoods, the first inflection point is lower than in softwoods (at around 5%) and the second inflection point is higher (at around 85%) than those of softwoods.Keywords: taper function; volume system; Central Spain; softwoods; hardwoods.

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