RT info:eu-repo/semantics/article
T1 Additivity on nonlinear stem taper functions: A case for Corsican pine in northern Spain
A1 Rodríguez Puerta, Francisco
A1 Lizarralde Torre, Íñigo
A1 Bravo Oviedo, Felipe
K1 Bosques y silvicultura - España
K1 Pinos - España
K1 Pinos - Crecimiento
K1 Bosques - Gestión - España
K1 3106 Ciencia Forestal
AB A system of additive equations was developed to predict whole-tree volume and the differentcomponents of Corsican pine. In this work, the nonlinear seemingly unrelated regression (NSUR) approach, which guarantees additivity in nonlinear equations, was evaluated. The effect of bark thickness on the accuracy of the results for all tree components was also assessed. Data for 351 trees, ranging in age from 10 to 72 years, were collected from 65 public and private sites. The volume estimates show average biases that range in absolute values from 2.19 to 31.02 dm3 for whole-tree, from 1.41 to 27.31 dm3 for wood, and from 1.05 to 16.52 dm3 for bark volume components. Errors in volume predictions were relatively small, representing less than 3% of the average observed wood volume and less than 6% of the average observed bark volume. This research showed that satisfactory predictions can be obtained from forcing additivity using NSUR approach with a minimal number of easily measurable tree variables, such as dbh and total height. FOR. SCI. 59(4):464–471.
PB Society of American Foresters
SN 0015-749X
YR 2013
FD 2013
LK https://uvadoc.uva.es/handle/10324/50524
UL https://uvadoc.uva.es/handle/10324/50524
LA eng
NO Forest Science, 2013, vol. 59, n. 4, p. 464-471
NO Producción Científica
DS UVaDOC
RD 23-nov-2024