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 2
Broadcast burning1 effects2 on forest floor chemistry after 10 and 20 years.
Year 10
Year 20
UB-C
B-C
value3
UB-C
B-C
value
Total C (g kg−1)
248 ± 31
269 ± 31
0.646
329 ± 20
353 ± 35
0.576
Total N (g kg−1)
6.2 ± 0.9
6.9 ± 0.9
0.656
8.6 ± 0.5
9.5 ± 0.9
0.440
C/N
41 ± 3
39 ± 3
0.714
39 ± 4
37 ± 7
0.832
NH4 - N (mg kg−1)
149.0 ± 34.2
103.0 ± 34.2
0.378
33.6 ± 1.1
29.6 ± 2.5
0.218
NO3 - N (mg kg−1)
49.3 ± 11.4
22.5 ± 11.4
0.148
missing data
Min-N
340 ± 54
333 ± 54
0.930
217 ± 51
281 ± 98
0.592
Avail. P
116 ± 34
156 ± 34
0.432
51 ± 8
73 ± 14
0.237
pH
4.53 ± 0.12
4.83 ± 0.12
0.123
4.22 ± 0.13
4.95 ± 0.30
0.087
CEC (cmolc kg−1)
69.4 ± 4.7
76.8 ± 4.7
0.306
33.2 ± 3.5
47.6 ± 7.9
0.169
Exch. Ca (cmolc kg−1)
17.0 ± 1.8
25.1 ± 1.8
0.018
21.15 ± 3.80
37.21 ± 8.51
0.160
Exch. Mg (cmolc kg−1)
2.63 ± 0.30
3.71 ± 0.30
0.041
1.74 ± 1.11
0.59 ± 1.95
0.636
Exch. K (cmolc kg−1)
0.74 ± 0.08
1.03 ± 0.08
0.039
1.74 ± 0.38
1.10 ± 0.67
0.447
Base satn. (%)
29 ± 2
39 ± 2
0.024
73 ± 10
82 ± 18
0.681
EC (mS/cm)
0.54 ± 0.06
0.37 ± 0.06
0.096
0.36 ± 0.06
0.25 ± 0.12
0.464
1 UB-C is unburned control; B-C is burned control. 2Values are mean ± one standard error. 3 values in bold indicate .
