Proposals for Nothofagus antarctica diameter growth estimation: simple vs. global models

H. Ivancich, G.J. Martínez Pastur, M.V. Lencinas, J.M. Cellini and P.L. Peri
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H. Ivancich: Centro Austral de Investigaciones Científicas (CONICET), Ushuaia, Tierra del Fuego, Argentina
G.J. Martínez Pastur: Centro Austral de Investigaciones Científicas (CONICET), Ushuaia, Tierra del Fuego, Argentina
M.V. Lencinas: Centro Austral de Investigaciones Científicas (CONICET), Ushuaia, Tierra del Fuego, Argentina
J.M. Cellini: Laboratorio de Investigaciones de Sistemas Ecológicos y Ambientales (LISEA-UNLP), La Plata, Buenos Aires, Argentina
P.L. Peri: Instituto Nacional de Tecnología Agropecuaria - Universidad Nacional de la Patagonia Austral, Río Gallegos, Santa Cruz, Argentina

Journal of Forest Science, 2014, vol. 60, issue 8, 307-317

Abstract: Tree growth is one of the main variables needed for forest management planning. The use of simple models containing traditional equations to describe tree growth is common. However, equations that incorporate different factors (e.g. site quality of the stands, crown classes of the trees, silvicultural treatments) may improve their accuracy in a wide range of stand conditions. The aim of this work was to compare the accuracy of tree diameter growth models using (i) a family of simple equations adjusted by stand site quality and crown class of trees, and (ii) a unique global equation including stand and individual tree variables. Samplings were conducted in 136 natural even-aged Nothofagus antarctica (Forster f.) Oersted stands in Southern Patagonia (Argentina) covering age (20-200 years), crown class and site quality gradients. The following diameter growth models were fitted: 16 simple equations using two independent variables (age and one equation for each stand site quality or crown class) based on Richards model, plus a unique global equation using three independent variables (age, stand site quality and crown class). Simple equations showed higher variability in their accuracy, explained between 54% and 92% of the data variation. The global model presented similar accuracy like the better equations of the simple growth models. The unification of the simple growth models into a unique global equation did not greatly improve the accuracy of estimations, but positively influenced the biological response of the model. Another advantage of the global equation is the simple use under a wide range of natural stand conditions. The proposed global model allows to explain the tree growth of N. antarctica trees along the natural studied gradients.

Keywords: growth models; site quality; crown class (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnljfs:v:60:y:2014:i:8:id:22-2014-jfs

DOI: 10.17221/22/2014-JFS

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