CLIMACS : a computer model of forest stand development for western Oregon and Washington /

Abstract

A simulation model (in FORTRAN IV) is described for the development of timber stands in the Pacific Northwest. The model shows growth of individual trees of 21 species in a 0.20 ha forest gap, provides a means of assimilating existing information, inddicates where knowledge is deficient, suggests where the forest system is most sensitive, and provides a first testing ground for hypotheses. Model verification simulations are included for up to 500 yr on various sites. Fire, wind or clear felling can oc ccur at intervals and intensities specified by users. Birth, growth and death of individual trees are functions of light and temperature, competition and species characteristics. Tree height growth is related to temperature and moisture conditions, and fo oliage biomass to diameter. Five mortality classes and shade tolerance classes are defined.