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Table 2 Chemical and physical soil characteristics from an old-growth Jeffrey pine forest on metamorphic soils in the Sierra San Pedro Mártir, northwestern Mexico. N = nitrogen (percent total), C = carbon (percent total), P = phosphorus, CEC = cation exchange capacity, Ca = calcium, Mg = magnesium, K = potassium, Na = sodium, SD = standard deviation of the mean. Asterisk (*) indicates significant difference (P < 0.05) from a nearby old-growth Jeffery pine-mixed conifer site on granitic soils (see Stephens and Gill 2005).

From: Surface fuel accumulation and decomposition in old-growth pine-mixed conifer forests, northwestern Mexico

  Particle size >2 mm*(%) pH N
(%)
C*
(%)
P*
(Mg kg−1)
Exchangeable cations (cmolc kg−1) Saturation Texture (%)
CEC Ca2+ Mg2+* K+ Na+* Sand Silt Clay
Mean 12.84 5.41 0.06 1.88 10.08 6.92 3.82 0.87 0.44 0.01 73.98 74.28 18.04 7.68
Max. 32.41 6.22 0.09 3.23 34.04 10.11 8.19 1.36 1.13 0.04 100.30 78.12 24.88 9.48
Min. 4.63 4.95 0.03 1.16 2.57 4.97 2.31 0.52 0.27 0.00 55.03 66.52 13.88 5.70
SD 6.69 0.27 0.01 0.47 6.38 1.27 1.21 0.20 0.18 0.01 9.54 2.77 2.43 0.89