RT info:eu-repo/semantics/article
T1 Comparison of stem taper equations for eight major tree species in the Spanish plateau
A1 Rodríguez Puerta, Francisco
A1 Lizarralde Torre, Íñigo
A1 Bravo Oviedo, Felipe
K1 Bosques y silvicultura - España
K1 Madera
K1 Bosques - Gestión - España
K1 Arboles - Crecimiento
K1 Árboles - España - Castilla y León
K1 3106 Ciencia Forestal
AB 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.
PB Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)
SN 2171-5068
YR 2015
FD 2015
LK https://uvadoc.uva.es/handle/10324/50537
UL https://uvadoc.uva.es/handle/10324/50537
LA eng
NO Forest Systems, 2015, Vol 24, Nº. 3, 13 pp.
NO Producción Científica
DS UVaDOC
RD 24-nov-2024