Lodgepole – Appendix E (2)

Lodgepole Pine at Crater Lake: History and Management of the Forest Structure
 Appendix E (2)

Comparison of age structure of the principal plant communities. Mean interval between classes was calculated as the mean of the intervals between two consecutive P. contorta age classes at least one of which antedates 1850. Community 3 = P. contorta/Carex – Stipa; 4 = P. contorta/Carex – Lupinus; 8 = A. magnifica var. shastensis – T. mertensiana/Carex – Lupinus; 7 = A. lasiocarpa/Haplopappus/Aster – Elymus; 10 = T. mertensiana/Vaccinum; 11 = Mixed Conifer/Arctostaphylos.

Mean

Mean
Stand Age

Mean Age of
Latest Class

Mean No.
Classes
Per Plot

Mean Interval
Between Classes*
(Years)

3

175

131

2.4

60

4

115

96

1.7

48

8

122

109

1.6

40

7

112

98

1.5

48

10

128

115

1.4

27

11

151

141

1.7

25

*Only plots with multiple age classes.

Mean Stand Age
3>4, 3>7, 3>8 (p = .01)
3>10 (p = .05)
11>4, 11>7, 11>8 (p = .05)

Mean Age of Latest Class
3>4, 3>7 (p = .01)
3>8 (p = .05)
8>4, 8>7 (p = .01)
11>4, 11>8, 11>7 (p = .01)
11>10 (p = .05)

Mean Class Interval
Not significantly different

Mean No. Classes Per Plot
3>8 (p = .01)
3>4, 3>10, 3>7 (p = .05)
11>10 (p = .05)

 

 

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