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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)