Modelling survival probability of individual trees in Norway spruce stands under different thinning regimes

Abstract

The probability that an indicidual tree will remain in even-aged Norway spruce (Picea abies (L.) Karst) stands subjected to different thinning programmes was modelled, using data from a thinning experiment established in 25 localities in southern Sweden. A logistic regression approach was used to predict the probability and the Hosmer-Lemeshow goodness-of-fit test to evaluate the fit. Diameter at breast height (DBH) quadratic mean DBH, thinning intensity, thinning quotient, basal area, number or stems per hectare, stand age, number of thinnings, and site index were used as explanatory variables. Separate analyses for stands thinned from below stands thinned from above and unthinned stands were performed. The modelles probability graphs for trees not being removed, plotted against their diameter at breast height, had cleas S-shapes for both unthinned stands and stands thinned from below. The graph for stands thinned from above was bell-shaped

Published in

Acta Biochimica Polonica
2005, Volume: 35, pages: 113-121 Publisher: Acta Biochimica Polonica

SLU Authors

• Norell, Lennart

  • Department of Energy and Technology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Forest Science


Permanent link to this page (URI)

https://res.slu.se/id/publ/5753