%0 Research article
%T Site index conversion equations for mixed trembling aspen and white spruce stands in northern British Columbia
%A Nigh, Gordon
%D 2002
%J Silva Fennica
%V 36
%N 4
%R doi:10.14214/sf.521
%U https://silvafennica.fi/article/521
%X White spruce and trembling aspen are two important commercial species in  British Columbia. They often grow in association, particularly in the  Boreal White and Black Spruce and Sub-Boreal Spruce biogeoclimatic  zones. Site index conversion equations are useful for estimating the  site index of one species from the site index of another species. This  study fills a need for site index conversion equations for mixed  spruce/aspen stands. Seventy 0.01 ha study plots were established in  mixed spruce/aspen stands. One site tree of each species was selected  from each plot. The height and breast height ages of the site trees were  measured and the site index was estimated with these data. The  correlation between the site index of spruce and aspen was 0.6.  Geometric mean regression was used to estimate the parameters of a  linear site index conversion equation. The analysis did not reveal any  differences in the conversion equations across the three major  biogeoclimatic units (BWBSmw1, BWBSmw2, and SBS) that were sampled.  Therefore, only one conversion equation is required.