Demonstration of Ecosystem Management Options Study
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DEMO Home > About Us > Study Areas
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Study Areas
To establish a broad geographic and ecological base of inference, six blocks were chosen to represent a diversity of forest types in western Oregon and Washington. Blocks encompass markedly different physical environments, mature forest structures, stand ages, and disturbance histories on the Umpqua (Oregon) and Gifford Pinchot (Washington) National Forests, and on the Department of Natural Resources' Capitol State Forest (table 1). Stands represent the western hemlock, grand fir, white fir, and silver fir zones (defined by the climax tree species). Douglas-fir dominates all sites, but associated tree species differ among blocks.
Click on block locations to view photos of sites.
Table 1—Range of characteristics of the six study blocks prior to harvest
|
Oregon |
Washington |
|||||
|
Watson
Falls |
Dog
Prairie |
Butte
|
Little
White Salmon |
Paradise
Hills |
Capitol
Forest |
|
|
Elevation (m) |
945–1310 |
1460–1710 |
975–1280 |
825–975 |
850–1035 |
210–275 |
|
Slope (%) |
4–7 |
34–62 |
40–53 |
40–66
|
9–33
|
28–52
|
| Aspect |
flat
|
SW
|
E–SE
|
NW–NE
|
various
|
various
|
| Stand Age (yr) |
110–130
|
165
|
70–80
|
140–170
|
110–140
|
65
|
| Tree density (no / ha)a |
310–500
|
258–475
|
759–1781
|
182–335
|
512–1005
|
221–562
|
| Tree basal area (m2/ha)a |
36–52
|
72–106
|
48–65
|
61–77
|
59–87
|
54–73
|
| Site index (m)b |
40–43
|
30
|
27–32
|
30
|
26–33
|
37–41
|
| Forest zone |
western hemlock
|
white fir
|
western hemlock
|
grand fir
|
silver fir
|
western hemlock
|
| Volume CWD (m3/ha) |
67–191
|
50–233
|
91–943
|
73–289
|
126–230
|
131–216
|
a Trees ≥ 5.0 cm d.b.h.
b Height of Douglas-fir at 50 yr.
CWD = coarse woody debris
US Forest Service - Pacific Northwest Research Station, Demonstration
of Ecosystem Management Options
Last Modified: Thursday,27March2008 at12:34:05EDT