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Individual distance-independent girth increment model for Douglas-fir in southern Belgium

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  • Monty, Arnaud
  • Lejeune, Philippe
  • Rondeux, Jacques

Abstract

An individual distance-independent girth increment model for pure stands of Douglas-fir (Pseudotsuga menziesii (MIRB.) FRANCO), comprising two equations, is presented. The data used to fit the model were collected from 1007 trees in 42 plots installed in regularly stocked and even-aged stands located in Wallonia (southern Belgium). Both equations predict girth increment from individual girth, dominant height, basal area per hectare, stand mean girth and variables linked to site fertility. These last variables are the site index H50 in the first equation, and a combination of mean annual rainfall and altitude in the second. The coefficient of determination ranges from 0.434 to 0.481 and the root mean square error ranges from 0.7857 to 0.8194cmyear−1. Estimated increments of 224 Douglas-fir trees in 12 different and independent stands were used to validate the model, which is expected to provide reliable predictions for most of the pure Douglas-fir stands located in the study area.

Suggested Citation

  • Monty, Arnaud & Lejeune, Philippe & Rondeux, Jacques, 2008. "Individual distance-independent girth increment model for Douglas-fir in southern Belgium," Ecological Modelling, Elsevier, vol. 212(3), pages 472-479.
    • Handle: RePEc:eee:ecomod:v:212:y:2008:i:3:p:472-479
    DOI: 10.1016/j.ecolmodel.2007.10.041
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    References listed on IDEAS

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    1. Nitschke, Craig R. & Innes, John L., 2008. "A tree and climate assessment tool for modelling ecosystem response to climate change," Ecological Modelling, Elsevier, vol. 210(3), pages 263-277.
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    1. Barbosa, Lorena Oliveira & dos Santos, Juscelina Arcanjo & Gonçalves, Anny Francielly Ataide & Campoe, Otávio Camargo & Scolforo, José Roberto Soares & Scolforo, Henrique Ferraço, 2023. "Competition in forest plantations: Empirical and process-based modelling in pine and eucalypt plantations," Ecological Modelling, Elsevier, vol. 483(C).

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