|Plots treated by thinning trees|
|Untreated Control plots|
Note: all values are in percent-shade, except for the Lux-Rank column (see below).
The "99-by-eye" estimates of canopy-closure were done by Bud Ewacha and Richard Reeves.
The "03-by-eye" estimates were done by Doris Ames.
The "camera" estimates involved taking a wide-angle photograph from ground-level pointing straight up, on a cloudy day, using a digital camera with a moderately wide-angle lens (a 35mm lens, when expressed in 35mm-camera-equivalent terms). These photographs were then analyzed algorithmically, by converting each to a Black & White image of 30,000 pixels, then computing percent-shade as the number of black pixels over 30,000. Photos and analysis done in 2003 by Eugene Reimer.
The "Densiometer" readings were taken in 2003 with a Model C (concave) Forest Densiometer from Robert E. Lemmon of Bartlesville OK; at each location we took 4 readings facing in 4 directions and averaged them; reported here is the average of 2 sets of such results done by Doris Ames and Eugene Reimer.
The "Lux" readings were taken with an Optikon Hagner model EC1 luxmeter, in 1999, 2000 and 2002. Shown here is only their ranking, where 01 is the brightest, 02 the 2nd brightest, and so on. (The actual readings are shown in a separate table, elsewhere in this report.)
The study site was a very dense cedar forest in 1997 prior to the cutting.
Then in 1997 and 1998 some trees were cut and removed, so as to increase the light-levels.
Plots were laid out in 1999; originally they were divided into 4 groups, by the degree to which
they had been affected by tree-removal. However due to conflicting results from our different ways of
measuring the degrees of treatment, and due to some doubt about how uniform the conditions were prior to
the cutting, we are now dividing the plots into only 2 groups, namely:
Control plots - those largely unaffected by the cutting, and
Treated plots - those receiving significantly more light as a result of cutting.