Canadian Forest Service Publications
Calibrating jack pine allometric relationships with simultaneous regressions. 2008. Schneider, R.; Berninger, F.; Ung, C.-H.; Bernier, P.Y.; Swift, D.E.; Zhang, S.Y. Canadian Journal of Forest Research 38: 2566-2578.
Available from: Atlantic Forestry Centre
Catalog ID: 28970
Allometric equations for estimating foliage biomass, sapwood area, and branch basal area from tree diameters and crown lengths for jack pine (Pinus banksiana Lamb.) in eastern Canada were calibrated using mixed models. A first model is presented that relates branch foliage biomass to branch diameter and relative position within the crown. These results show that a branch’s foliage biomass is inversely proportional to its depth within the crown. At the tree level, foliage biomass was found to be proportional to crown length and to vary with stem age and slenderness. Pipe model parameters (sapwood area and branch basal area to foliage biomass) were also calculated. The sapwood area to foliage biomass parameter is proportional to stand density, whereas branch basal area to foliage biomass is constant. The tree-level allometeric models were calibrated using a mixed-effects seemingly unrelated regression to account for between-model correlations.