Comparing Regional and Site-Specific Biomass and Nutrient Budget Models for Douglas-fir

Biomass estimation models are often used to aid in developing site nutrient budgets. However, readily available biomass models are regional and thus potentially mask nutritional affects of site-type. Site nutrient richness may influence Douglas-fir allometric relationships and could affect the nutrient content of tree components. To test this, we selected mature stands of consistent climate regime that were deemed either poor site nutrition (quartzite parent material, 3 sites) or good site nutrition (basalt parent material, 3 sites). This comparison will help define when and where generalized or site-specific biomass models