Prescribed Burning and Clear-Cutting Effects on Understory Vegetation in a Pinus canariensis Stand (Gran Canaria)

Table 3

Cutting and burning effects on soil in Pinus canariensis forest stand (Gran Canaria, Canary Islands). Mean and standard deviation (in brackets) of soil parameters in the control (C), cleared (CT), and burnt (B) plots before treatment and six, eighteen, and twenty-four months after treatment.

	Prefire			6 months			18 months			24 months
	C	CT	B	C	CT	B	C	CT	B	C	CT	B
pH	6.27 (0.15)	6.29 (0.20)	6.46 (0.18)	6.5 (0.15)^a	6.18 (0.24)^b	6.74 (0.23)^a	6.2 (0.75)	6.28 (0.37)	6.52 (0.32)	6.47 (0.50)	6.44 (0.24)	6.51 (0.31)
% OM	3.47 (0.25)	4.04 (0.67)	3.95 (0.72)	5.03 (2.03)	5.28 (1.42)	4.98 (1.89)	3.87 (1.06)	4.26 (0.82)	4.03 (0.74)	4.27 (0.96)	4.5 (0.60)	4.08 (1.01)
ppm P	12.67 (4.62)	11.56 (5.73)	12.75 (5.75)	10.67 (3.06)^a	8.89 (7.75)^a	21.11 (8.25)^b	14 (5.29)^ab	10 (5.39)^a	19.78 (7.97)^b	6.67 (4.16)	7.56 (7.73)	12.67 (7.42)
Ca	9.33 (1.70)	8.58 (1.50)	9.75 (1.48)	9.53 (2.37)^ab	8.82 (1.87)^a	11.82 (1.94)^b	11.13 (3.79)	9.31 (2.08)	12.02 (3.70)	11 (3.89)	9.38 (1.78)	10.76 (3.24)
Mg	5.53 (1.70)	4.47 (1.50)	4.83 (1.48)	4.47 (2.37)	4.09 (1.87)	4.18 (1.94)	5.53 (3.79)	4.47 (2.08)	5 (3.70)	6.47 (3.89)	4.82 (1.78)	4.84 (3.24)
K	1.37 (1.70)	1.29 (1.50)	1.3 (1.48)	2.3 (2.37)^a	1.64 (1.87)^b	1.7 (1.94)^b	1.9 (3.79)	1.5 (2.08)	1.56 (3.70)	2.00 (3.89)	1.47 (1.78)	1.43 (3.24)
Na	0.87 (0.15)	0.91 (0.20)	0.93 (0.18)	1.37 (0.15)	1.21 (0.24)	1.32 (0.23)	2.5 (0.75)	2.18 (0.37)	2.12 (0.32)	1.83 (0.50)	1.51 (0.24)	1.4 (0.31)

C: control; CT: cut; B: burnt; different letters indicate significant differences (permutational ANOVA, 9999 permutations, 𝑃<0.05; pairwise 𝑡-test, 𝑃<0.05).