Agriculture Reference
In-Depth Information
Fig. 2.4
Examples illustrating the various ways to calculate the bulk density of a fuelbed or fuel
component. Bulk density is estimated as the mass of the fuel divided by volume. Volume is calcu-
lated as the area of concern times the height of the fuel making it scale dependent:
a
the volume
is calculated from an estimate of depth across the fuelbed unit area;
b
the volume is calculated for
the individual plant, particle, or component;
c
litter and duff bulk densities are more consistent
because the depth is less variable across space; and
d
volume is calculated as an integrated average
fuelbed depth
fuelbed (Fig.
2.4a
), for each individual plant (Fig.
2.4b
), or estimated from an aver-
age integrated height of plants in a fuelbed (Fig.
2.4d
).
2.3.3
Fuel Layer
2.3.3.1
Fuel Layer Depth (
δ
)
Fuelbed depth is the thickness of the surface fuel layer (Tables
2.1
and
2.2
). Many
surface fuel components exist as layers of biomass above the ground, and fuelbed
depth is the highest height of any fuel particle of any component integrated over
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