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Developing a dynamic growth model for teak plantations in India

作者：

V. P. Tewari;Juan Gabriel Álvarez González;Oscar Garcı́

单位：

University of Northern British Columbia, Columbia, Canad;Forest Biometry Division, Institute of Wood Science and Technology, Bangalore, India;Unidad de Gestión Forestal Sostenible, Departamento de Ingeniería Agroforestal, Universidad de Santiago de Compostela, Lugo, Spain

关键词：

Mortality;Basal area;Canopy closure;Relative occupancy;State-space approach;Tectona grandi

摘要：

Tectona grandis (teak) is one of the most important tropical timber speciesoccurring naturally in India. Appropriate growth models, based on advanced modeling techniques,are not available but are necessary for the successful management of teak stands in the country.Long-term forest planning requires mathematical models, and the principles of Dynamical SystemTheory provide a solid foundation for these. The state-space approach makes it possible to accommodate disturbances and avarying environment. In this paper, an attempt has been made to develop a dynamic growthmodel based on the limited data, consisting of three annual measurements, collected from 22 teak sample plots in Karnataka, Southern India. A biologically consistent whole-stand growth model has been presented which uses thestate-space approach for modelling rates of change of three state-variables viz., dominant height,stems per hectare and stand basal area. Moreover, the model includes a stand volume equationas an output function to estimate this variable at any point in time. Transition functions werefitted separately and simultaneously. Moreover, a continuous autoregressive error structure isalso included in the modelling process. For fitting volume equation, generalized method of moments was used to get efficient parameter estimates under heteroscedastic conditions. A simple model containing few free parameters performed well and is particularlywell suited to situations where available data is scarce.

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Developing a dynamic growth model for teak plantations in India

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