Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects. Page: 100 of 115
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for up to a total of 384 smaller squares per site (96 x 4), and then averaging all four
readings at the different orientations about the reference tree. Obviously, in a forest
environmentyou will be counting considerably lessthan 96 dots representing the smaller
squares, so the exercise is a lot less laborious than it might first appear. The denser the
overstory canopy, the fewer dots you will have to count since you are counting the 1/8"
x 1/8" areas in which you can see sky in the major portion of each of the smaller squares.
With a little practice, you will find that the data can be gathered quickly and with
repeatability using the same or different operators-
You can use another trick that will speed your data collection in open forest where greater
than half of the canopy area is open to the sky. You can reverse the process and count
just the smaller square areas (1/8" x 1/8") that are covered by the canopy. If you then
multiply by 1.04 you will obtain the estimated overstory density directly in percent.
The SPHERICAL DENSIOMETER is designed for rugged field use (rain or shine), yet
compact and light weight enough to tit into a shirt or coat pocket for ease of transport.
When used with respect, this little instrument has given many years of field service. Each
instrument box is hand made of walnut and may have some unique "character" as might
be expected using a natural wood product. Attempts have been made to keep the knots
and blemishes to a minimum; however, they were incorporate where they added beauty
to the box and did not compromise the integrity of the instrument.
LIFETIME WARRANTY: If a SPHERICAL DENSIOMETER becomes inoperable, we will
repair or replace it at no cost to you, beyond the cost of shipping the instrument to us;
provided the instrument has not been severely abused. If the box appears to have been
used to drive nails or has been run over by a logging truck, I'm afraid these examples.
would fall under the "severely abused" category.
References:
Lemmon, Paul E., 1956, A Spherical Densiometer for Estimatinq Forest Overstory
Density: Forest Science 2(4)314-320.
Lemmon, Paul E., 1957, A New Instrument for Measuring Forest Overstory Density; Jour.
Forestry 55(9)667-668.501703.let
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Ashley, Paul R. Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects., report, January 1, 1997; Olympia, Washington. (https://digital.library.unt.edu/ark:/67531/metadc703292/m1/100/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.