Appendix E (2)
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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) |
