Ecological Archives
M076011A1
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 m^{3}, 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 R^{2}

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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