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Oregon Indicators of Sustainable Forests

Indicator E.a. - Maps and Data for the Report on the Willamette Valley Mapping Region
 
Figure 30. Forest type based on dominant species. 
Figure 31. Size classes. 
Figure 32. Amount of forested area in each size class by dominant tree species. 
Figure 33. Percent canopy cover of all live trees. 
Table 9. Summary statistics of the diversity of forest types. 
 
 

Figure 30. Forest type based on dominant species
 
This is a map of the forest types based on dominant species for the Willamette Valley Mapping Region. 
 

Map Legend and Data for Figure 30
Dominant Species
Hectares (Acres) x 1000
Percent of Total
Forested Area
 Douglas-fir
327 (807)
64.4
 Bigleaf maple
33 (82)
6.5
 Oregon white oak
23 (56)
4.5
 Red alder
22 (54)
4.4
 Western redcedar
15 (36)
2.9
 Grand fir
6 (14)
1.1
 Oregon ash
6 (14)
1.1
 Western hemlock
6 (13)
1.1
Other species
16 (40)
3.2
 Regenerating forest
56 (138)
11.0
 
 
Printable map and data file [jpg; 416 KB]

 
 
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Figure 31. Six categories of size classes.
 
This is a map displaying six categories of size classes for the Willamette Valley Mapping Region. 


 
Map Legend and Data for Figure 31
Size Class
Hectares (Acres) x 1000
Percent of Total
Forested Area
 Shrub/Seedling
QMDA_DOM <2.5 or CANCOV <10
6 (14)
11.0
 Sapling/Pole
QMDA_DOM <=2.5 and <25.0
148 (366)
29.2
Small tree
QMDA_DOM <=25.0 and <37.5
140 (346)
27.6
Medium tree
QMDA_DOM <=37.5 and <50.0
93 (231)
18.4
Large tree
QMDA_DOM <=50.0 and <75.0
60 (149)
11.9
Giant tree
QMDA_DOM >=75.0
0 (0)
1.9
 
*QMDA_DOM represents the quadratic mean diameter (in centimeters) or the dominent tree species.  CANCOV represents canopy cover estimated from the Forest Vegetation Simulator.
 
 
Printable map and data file [jpg; 223 KB]

 
 
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Figure 32. Amount of forested area in each size class by dominant tree species.
 
This is a bar graph displaying the amount of forested area in each size class by dominant tree species for the Willamette Valley Mapping Region. 
 
 
Printable chart [jpg; 64 KB]

 
 
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Figure 33. Percent canopy cover of all live trees.
 
This is a map displaying the percent canopy cover of all live trees in the Willamette Valley Mapping Region. 
 
 

Map Legend and Data for Figure 33
Canopy Cover Class
Hectares (Acres) x 1000
Percent of Total
Forested Area
 Less than 10%
62 (153)
12.2
 10% to 40%
72 (178)
14.2
 40% to 70%
166 (410)
32.7
 Greater than 70%
208 (513)
40.9
 
 
Printable map and data file [jpg; 380 KB]

 
 
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Table 9. Summary statistics of the diversity of forest types.
 
Species
Average
Percent
Canopy
Cover
Area
Hectares (Acres)
Percent
of Total
Forest Area
Number of
Forest
Subtypes
 Douglas-fir
72
326,757 (807,435)
64
17
 Bigleaf maple
51
33,166 (81,955)
7
4
 Oregon white oak
52
22,658 (55,988)
3
3
 Red alder
64
22,107 (54,628)
4
8
 Western redcedar
74
14,520 (35,879)
6
6
 Grand fir
60
5,747 (14,201)
1
2
 Oregon white oak
24
5,603 (13,845)
1
1
 Western hemlock
67
5,375 (13,281)
1
5
 Black cottonwood
63
4,452 (11,000)
0.8
2
 California black oak
75
3,024 (7,473)
0.6
2
 Pacific madrone
67
2,817 (6,960)
0.6
1
 Willow
12
2,605 (6,436)
0.5
1
 Pacific dogwood
84
2,447 (6,048)
0.5
1
 Giant chinquapin
72
690 (1,704)
0.1
1
 
 
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