Ecological Archives M076-011-A1

Robert Van Pelt, Thomas C. O'Keefe, Joshua J. Latterell, and Robert J. Naiman. 2006. Riparian forest stand development along the Queets River in Olympic National Park, Washington. Ecological Monographs 76:277–298.

Appendix A (Table A1). Regression equations used for calculating wood volume. All regression equations take the form of
(((a * (dbh b )) + (c * (Ht d ))), with dbh (diameter at 1.37 m) in cm and height in m (*The exception is Acer circinatum, which requires a basal diameter). Since the largest Salix in the study was less than 0.5 m3, the equation for Alnus was used. Trees selected for use in developing the equations include other trees from sites of high productivity.

 
 
 
 
 
dbh
Height
 
 
Component
a
b
c
d
Max
Min
Max
Min
Adj R2
N

Picea sitchensis                    
 
2.596 E -04
2.300
1.780 E -04
2.697
401.7
5.1
92.7
6.1
0.848
61
Tsuga heterophylla                    
 
5.220 E -05
2.574
4.208 E -05
3.078
194.5
1.2
72.2
1.2
0.981
55
Populus balsamifera trichocarpa                    
 
3.640 E -04
2.205
1.757 E -05
3.203
161.2
20.3
51.8
18.2
0.833
28
Acer macrophyllum                    
 
1.074 E -04
2.543
2.033 E -04
2.512
137.1
6.8
35.3
3.3
0.924
17
Alnus rubra                    
 
3.360 E -04
2.181
5.764 E -04
2.163
68.8
1.6
36.4
4.1
0.844
43
Acer circinatum                    
 
6.174 E -05
2.770
3.321 E -06
4.087
30.3*
2.0*
12.9
1.4
0.950
36


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