Abstract

MOREIRA, Adelina M.  and  FONSECA, Teresa F.. Tabela de Produção para o Pinhal do Vale do Tâmega. Silva Lus. [online]. 2002, vol.10, n.1, pp.63-71. ISSN 0870-6352.

Data collected on sampling plots located in the Tâmega valley were used to develop yield tables for maritime pine. The control variables of this model refer to the site quality index and the Wilson spacing index. Mean diameters and stand volume before thinning are determined by modified versions of the equations proposed by HALL and MARTINS (1986) for the central coastal region of Portugal. The mean diameter of removed trees is estimated according to the mean diameter before thinning, the number of removed trees and the ratio between removed trees and the number of trees before thinning. The equation established for the prediction of the volume removed by thinning is a function of the mean diameter and the number of removed trees. Predicted removed and remaining volumes allow the calculation of the total production and, thereafter, the determination of current and mean annual increments. The results are indicated in three tables, according to the site quality level (low, medium and high).

Keywords : yield model; average silviculture; maritime pine.

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