Predicting the Probability of Survival for Balsam Fir, Red Spruce and WhiteSpruce during a Spruce Budworm Outbreak in Maine : Environmental Influences on Tree and Stand Increment. Mensuration, Growth and Yield Instruments and Methods in Forest Mensuration. Proceedings

1986

1 Tab., 5 Lit. Ang., En, Zfsg. En

Unselbständiges Werk

7453

200017678

Survival models are a necessary component of a forest growth simulation. Equations are presented to estimate the probability of survivaland the conditional probability of cause of death given that the tree has died , for red spruce (Picea rubens Sarg.) white spruce (Picea glauca Voss.) and balsam fir (Abies balsamea L.) during a spruce budworm (Choristoneura fumiferana Clem.) epidemic. Both individual tree (crown class and species) and stand variables (fir ba/a, spruce ba/a, hardwood ba/a, old defoliation and new defoliation ratings for the plot) were significant in explaining the variability of survival during the epidemic.