Enabling better global research outcomes in soil, plant & environmental monitoring. 19
interpreted with Sap Flow Tool. Needle Temperature Mode is generally not
recommended.
Pulse Energy
allows you to select the joules output during the heat pulse. 20
joules is appropriate for most applications. In delicate plants, you may need to
use 10 joules to prevent damage. In plants with exceptionally high sap flow
rates, you may need to use a higher value.
8.1.1 Corrections
Corrections are used for pre-processed channels
–
Corrected Inner and Outer;
and Sap Flow (kg/hr). Note that data can be post-corrected in ICT DataView.
Probe Spacing
allows you to set the distance between probes. By default, this
is set to 5mm. The original HRM principle was developed using 6mm spacing,
as such this option is provided, though it is not recommended. The standard
drill guide uses 5mm spacing.
Base-line Asymmetry Multiplier and Offset
are used to correct for small
needle misalignments. See the SFM1x Manual for more information.
Thermal Diffusivity
. A default value of 0.0025cm
2
s
-1
is provided. For greater
accuracy, the thermal diffusivity of the fresh (green) sapwood can be
measured and entered. See the SFM1x Manual for more information.
Wounding Coefficient
is used to correct for the wound response of the tree.
This is usually measured after de-installation; however, some example values
are provided in the SFM1x Manual.
Vs Factor
is a multiplier used to convert corrected Heat Pulse Velocity to
Corrected Sap Velocity. See the SFM1x Manual for more information.
Sap Wood Area
is the cross-sectional area of conducting sapwood. This can be
calculated automatically by entering bark depth, sapwood thickness, and tree
diameter at installation/breast height into the SFM Water Usage mode of ICT
DataView. Contact ICT International for more information.