Table 1.

Mean values of climatic and edaphic factors (± standard error) in soils from croplands and grassland sites used in this experiment (n = 210). Differences between land use types were assessed using Wilcoxon’s rank test. The last column shows the Spearman rank correlation coefficient of all variables with the ³³P recovery with p-values in brackets.

		Mean (± SEM)		p-value (Wilcoxon’s rank test)	Correlation with 33P recovery
	Unit	Grassland	Cropland
Aridity	unitless	0.09 (±0.05)	0.11 (±0.03)	0.670	-0.14 (0.053)
Annual temperature	°C	9.74 (±0.36)	9.19 (±0.25)	0.180	0.03 (0.685)
Clay	%	27.3 (±1.48)	28.2 (±0.98)	0.740	0.12 (0.090)
Silt	%	33.6 (±1.67)	39.7 (±0.95)	0.003**	0.00 (0.983)
pH	unitless	6.84 (±0.11)	7.11 (±0.06)	0.044*	0.15 (0.027)*
Nmin	mg g-1	14.6 (±1.12)	15.1 (±0.81)	0.810	-0.08 (0.267)
Olsen-P	mg g-1	23.9 (±2.44)	38.2 (±2.07)	<0.001**	-0.24 (<0.001)**
Soil C:N	g g-1	8.61 (±0.33)	8.20 (±0.17)	0.230	-0.07 (0.348)
Soil N:P	g g-1	0.62 (±0.59)	0.03 (±0.00)	<0.001**	0.20 (0.005)**
Soil Nmin:Pmin	g g-1	1.53 (±0.33)	0.72 (±0.10)	<0.001**	0.18 (0.010)*
SOC	mg g-1	20.2 (±1.56)	15.1 (±0.57)	0.003***	0.17 (0.013)*
Microbial biomass C	mg g-1	0.75 (±0.05)	0.44 (±0.02)	<0.001**	0.33 (<0.001)**
Root AMF Richness	No. OTUs	24.9 (±1.07)	17.7 (±0.64)	<0.001**	0.41 (<0.001)**
Root AMF Shannon	unitless	2.27 (±0.05)	1.82 (±0.04)	<0.001**	0.37 (<0.001)**
Soil bacteria	index	9.74 (±0.03)	9.88 (±0.02)	<0.001**	-0.15 (0.029)*
Soil fungi Shannon	index	3.79 (±0.06)	3.44 (±0.04)	<0.001**	0.19 (0.006)**
Soil fungi Richness	No. OTUs	198 (±5.06)	158 (±2.84)	<0.001**	0.20 (0.004)**
Soil cercozoa Shannon	index	4.93 (±0.03)	4.96 (±0.02)	0.600	-0.07 (0.329)
Soil archaea Shannon	index	1.98 (±0.04)	2.06 (±0.03)	0.210	-0.02 (0.745)
Soil archaea Richness	No. OTUs	77.1 (±2.31)	77.9 (±1.68)	0.690	-0.07 (0.308)

^*P<0.05;

^**P<0.01