Table 2 Physical and chemical properties of the litter and duff layers and the top mineral soil in 8 yr old, 28 yr old, and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico. Values are average (n = 3) with the standard error in parentheses. Letters indicate significant differences between means (P < 0.05) with the post-hoc Tukey test.
From: Soil Carbon and Nutrient Recovery after High-Severity Wildfire in Mexico
Litter layer (LL) | Duff layer (DL) | Top mineral soil layer (0 cm to 10 cm) | |||||||
|---|---|---|---|---|---|---|---|---|---|
Stand age (yr) | Stand age (yr) | Stand age (yr) | |||||||
Property | 8 | 28 | 60 | 8 | 28 | 60 | 8 | 28 | 60 |
Depth (cm) | 3.6a (0.5) | 8.2b (0.5) | 7.1c (0.6) | 1.9a (0.4) | 8.2 b (0.5) | 7.4b (0.4) | 10 | 10 | 10 |
Bulk density (g cm−3) | 0.01a (0.001) | 0.03b (0.004) | 0.02b (0.001) | 0.03a (0.005) | 0.05b (0.002) | 0.06b (0.007) | 0.79 (0.007) | 0.61 (0.041) | 0.67 (0.077) |
C (mg g−1) | 471.5 (7.1) | 478.7 (2.8) | 472.4 (3.5) | 444.1 (11.8) | 459.5 (1.0) | 454.4 (9.3) | 57.4 a (4.3) | 72.1 b (2.6) | 85 c (3.5) |
N (mg g−1) | 5.5 (0.8) | 5.7 (0.2) | 6.1 (0.3) | 7.5 (0.2) | 9.1 (0.8) | 8.7 (0.3) | 3.7 a (0.1) | 4.0 ab (0.1) | 4.8 b (0.3) |
P (mg g−1) | 0.3 (0.05) | 0.4 (0.02) | 0.4 (0.05) | 0.3 (0.08) | 0.5 (0.01) | 0.5 (0.03) | 0.8 (0.03) | 1.0 (0.17) | 1.4 (0.20) |
C:N | 91 (11) | 84 (4) | 79 (49) | 61 (1) | 52 (5) | 53 (3) | 16 (2) | 19 (1) | 18 (1) |
N:P | 17 (2) | 14 (1) | 17 (2) | 28 (5) | 20 (2) | 18 (1) | 6 (2) | 4 (1) | 4 (1) |
C:P | 1553 (280) | 1183 (46) | 1304 (188) | 1738 (323) | 1030 (25) | 958 (72) | 118 (60) | 74 (8) | 65 (13) |