3
1
11.6 V
s
Factor
The factor used to convert correct Heat Pulse Velocity (V
c
) to
Corrected Sap Velocity (V
s
)
11.7
Sap Wood Area
Note:
Applying any of these correction factors within the instrument will
result
in
sacrificin
g
the
firs
t
few
days
of
data
(or
more)
until
the
various
parameters are
determined. If raw heat pulse velocities are measured and corrections
are
done
in
Sap
Flow
Tool
S
oftware
then
no
data
is
sacrifice
d,
as
all data can be instantly
reprocessed once the correction parameters have been determined.
ICT International
Enabling better global research outcomes in soil,
plant & environmental monitoring.
The area of water conducting xylem or sapwood in which the water moves
through the tree must be determined to calculate volumetric sap flow. This
process involves taking a sapwood core with a coring tool and using a dye to
stain the sapwood. A direct measurement of the radial thickness of the sapwood
can then be measured to calculate the Cross Sectional Area. This must then be
weighted against each of the two annulus measured by the Inner and Outer
measurement points. These values are then entered into the corresponding
Sapwood Area Outer & Inner input fields in the Sap Flow Meter Software.
Alternatively, the full sapwood thickness entered as a single value into SFT1 Sap
Flow Tool Software.
