How do trees affect spatio-temporal heterogeneity of nutrient cycling in mediterranean annual grasslands?

Guillermo Gea-Izquierdo; Barbara Allen-Díaz; Alfonso San Miguel; Isabel Cañellas

doi:10.1051/forest/2009091

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Volume 67 / No 1 (January-February 2010)

Ann. For. Sci., 67 1 (2010) 112

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APPENDIX: Table I

Soil data in relation to canopy and orientation. Below canopy are means of 0.375R and 0.75R. Beyond canopy vertical influence are calculated as average between 2.0R and 2.5R.

		Below canopy		Beyond canopy
						Total mean
		NE	SW	NE	SW
pH	Mean	5.674	5.798	4.978	5.014	5.325	Max	6.630
pH	SD	0.420	0.483	0.312	0.269	0.499	Min	4.490

OM (%)	Mean	1.467	1.631	0.744	0.941	1.165	Max	2.290
OM (%)	SD	0.333	0.394	0.231	0.205	0.421	Min	0.350

N (%)	Mean	0.072	0.078	0.036	0.048	0.056	Max	0.130
N (%)	SD	0.025	0.040	0.012	0.018	0.029	Min	0.010

C:N	Mean	15.173	16.038	16.986	16.932	16.508	Max	47.270
C:N	SD	2.463	10.416	5.748	10.216	7.635	Min	8.310

P (ppm)	Mean	26.792	31.100	28.025	21.275	26.917	Max	64.800
P (ppm)	SD	17.040	15.595	15.293	12.601	15.056	Min	0.000

K (ppm)	Mean	102.478	150.588	57.003	60.700	89.600	Max	237.780
K (ppm)	SD	34.784	40.323	10.205	10.707	42.300	Min	41.450

Ca (meq/100 g)	Mean	2.572	3.251	0.804	1.348	1.859	Max	5.590
Ca (meq/100 g)	SD	1.018	1.391	0.247	0.402	1.141	Min	0.460

Mg (meq/100 g)	Mean	0.348	0.478	0.135	0.203	0.274	Max	0.720
Mg (meq/100 g)	SD	0.116	0.142	0.042	0.073	0.146	Min	0.080

CEC (meq/100 g)	Mean	8.685	9.663	6.703	6.849	7.678	Max	13.910
CEC (meq/100 g)	SD	2.323	2.937	1.893	2.630	2.616	Min	2.340

Sand (%)	Mean	85.020	84.412	86.192	82.496	84.386	Max	91.833
Sand (%)	SD	3.841	2.878	3.329	5.491	4.181	Min	70.085

Silt (%)	Mean	12.564	14.619	12.667	16.063	14.340	Max	27.493
Silt (%)	SD	3.641	2.910	3.182	5.054	3.928	Min	7.214

Clay (%)	Mean	1.224	1.362	1.141	1.440	1.274	Max	2.422
Clay (%)	SD	0.267	0.256	0.195	0.449	0.323	Min	0.785

Density (g/cm³)	Mean	1.396	1.378	1.664	1.559	1.501	Max	1.883
Density (g/cm³)	SD	0.138	0.154	0.157	0.137	0.173	Min	1.082