Research on biomass and C stock requires destructive sampling, which is labor-intensive and time-consuming, particularly for mature trees. Alternatively, biomass and C content are often predicted using their allometric relationships (functions) with growth traits. Understanding information about how growth selection influences the functions is very limited. Stovall et al. (2013) developed relationships between total tree biomass and biomass of tree compartments of 6-year-old P. taeda (L.); they found the relationship varied significantly with clone. Comparisons of growth functions (i.e. relationship between height and diameter, site index) between seed sources have confirmed that a general relationship would be appropriate for all seed sources but the relationship parameters need adjustments to reflect growth difference (Buford and Burkhart, 1987; Weng et al., 2008, 2010).