Soil Characteristics and Lodgepole Pine (Pinus contorta var. latifolia) Performance Two Decades after Disk Trenching of Unburned and Broadcast-Burned Plots in Subboreal British Columbia
Table 5
Treatment1 effects2 on lodgepole pine height, ground-level diameter (), height : diameter ratio (HDR), and stem volume index in years 6, 10, and 19.
Burning effects
Position effects
Burning × position effects
Year
Unburned
Burned
value3
Control
Hinge
Trench
value
UB-C
UB-H
UB-T
B-C
B-H
B-T
value
Height (cm)
6
113 ± 4
117 ± 4
n/a
113 ± 3
136 ± 3
96 ± 3
n/a
107 ± 5 cd
134 ± 5 ab
98 ± 5 e
118 ± 4 bc
138 ± 4 a
95 ± 4 de
0.002
10
239 ± 7
247 ± 7
n/a
232 ± 5
274 ± 5
221 ± 5
n/a
222 ± 8 cd
273 ± 8 ab
222 ± 8 cd
243 ± 7 bc
276 ± 7 a
221 ± 7 d
0.003
19
643 ± 12
671 ± 12
n/a
643 ± 9
698 ± 9
631 ± 9
n/a
619 ± 14 c
689 ± 14 ab
620 ± 14 c
667 ± 13 b
706 ± 13 a
641 ± 13 c
0.033
(cm)
6
2.6 ± 0.1
2.8 ± 0.1
n/a
2.7 ± 0.1
3.2 ± 0.1
2.3 ± 0.1
n/a
2.5 ± 0.1 cd
3.1 ± 0.1 ab
2.3 ± 0.1 e
2.9 ± 0.1 bc
3.3 ± 0.1 a
2.3 ± 0.1 de
0.003
10
5.7 ± 0.2
6.0 ± 0.2
n/a
5.7 ± 0.1
6.6 ± 0.1
5.3 ± 0.1
n/a
5.4 ± 0.2 cd
6.5 ± 0.2 ab
5.3 ± 0.2 cd
6.0 ± 0.2 bc
6.8 ± 0.2 a
5.3 ± 0.2 d
0.001
19
13.8 ± 0.3
14.8 ± 0.3
n/a
14.1 ± 0.2
15.5 ± 0.2
13.2 ± 0.2
n/a
13.2 ± 0.3 d
15.1 ± 0.3 ab
13.0 ± 0.3 d
15.0 ± 0.3 bc
16.0 ± 0.3 a
13.5 ± 0.3 d
0.0006
HDR
6
44 ± 1
43 ± 1
0.454
43 ± 1
43 ± 1
44 ± 1
0.264
44 ± 1
44 ± 1
44 ± 1
42 ± 1
42 ± 1
43 ± 1
0.354
10
42 ± 1
41 ± 1
0.454
41 ± 1
42 ± 1
42 ± 1
0.183
42 ± 1
43 ± 1
42 ± 1
41 ± 1
41 ± 1
42 ± 1
0.136
19
48 ± 1
46 ± 1
0.111
47 ± 1 b
45 ± 1 b
49 ± 1 a
<.0001
48 ± 1
46 ± 1
49 ± 1
45 ± 1
45 ± 1
48 ± 1
0.187
Volume index (cm3)
6
262 ± 33
299 ± 32
n/a
264 ± 24
402 ± 24
176 ± 24
n/a
225 ± 35 cd
386 ± 35 ab
176 ± 35 cd
302 ± 34 bc
419 ± 34 a
176 ± 34 d
0.013
10
2406 ± 203
2670 ± 196
n/a
2284 ± 151
3374 ± 151
1957 ± 150
n/a
2001 ± 219 cd
3238 ± 219 ab
1980 ± 217 cd
2566 ± 207 bc
3510 ± 207 a
1934 ± 207 d
0.004
19
34,656 ± 1748
41,223 ± 1652
n/a
36,174 ± 1349
45,913 ± 1347
31,732 ± 1340
n/a
30,913 ± 1992 d
42,979 ± 1988 ab
30,076 ± 1963 d
41,435 ± 1820 bc
48,847 ± 1819 a
33,387 ± 1823 d
0.002
1 Refer to Table 1 for treatment abbreviations. 2Values are mean ± one standard error. Letters are supplied only for variables where the Bonferroni test found significant differences between individual means within a given year. Means having the same letter do not differ significantly () within the given year according to the Bonferroni test. 3 values in bold indicate .
