Height-diameter models for Scots pine and birch in Finland

Mehtätalo, Lauri

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Silva Fennica vol. 39 no. 1 article id 395 | 2005 | Research article

Lauri Mehtätalo

Height-diameter models for Scots pine and birch in Finland

Mehtätalo L. (2005). Height-diameter models for Scots pine and birch in Finland. Silva Fennica vol. 39 no. 1 article id 395. https://doi.org/10.14214/sf.395

Abstract

Height-Diameter (H-D) models for two shade-intolerant tree species were estimated from longitudinal data. The longitudinal character of the data was taken into account by estimating the models as random effects models using two nested levels: stand and measurement occasion level. The results show that the parameters of the H-D equation develop over time but the development rate varies between stands. Therefore the development of the parameters is not linked to the stand age but to the median diameter of the basal-area weighted diameter distribution (DGM). Models were estimated with different predictor combinations in order to produce appropriate models for different situations. The estimated models can be localized for a new stand using measured heights and diameters, presumably from different points in time, and the H-D curves can be projected into the future.

Keywords
mixed model; longitudinal analysis; random parameter; stand development

Author Info

Mehtätalo, Finnish Forest Research Institute, Joensuu Research Centre, P.O. Box 68, FI-80101 Joensuu, Finland E-mail lauri.mehtatalo@metla.fi

Received 25 March 2004 Accepted 27 January 2005 Published 31 December 2005

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