Canopy bulk density
n. The mass of available canopy fuel per unit canopy volume (Scott and Reinhardt 2001).
Canopy bulk density is a bulk property of a plot, stand, or group of trees, not of an individual tree (see crown bulk density). The most basic methods for estimating canopy bulk density use a tree list in conjunction with allometric equations to predict individual-tree biomass. The biomass data are then summarized by any of several methods to provide an estimate of bulk density or to create a vertical profile of bulk density in horizontally thin layers.
Canopy bulk density is used to predict whether an active crown fire is possible. The product of canopy bulk density and rate of spread is mass-flow rate; a minimum mass-flow rate is hypothetically required to maintain an active crown fire.