. 2014 Aug 12;9(8):e104198. doi: 10.1371/journal.pone.0104198

Table 4. Relationship between tested soil attributes and the age of the reforestation sites (n = 15).

Variable	Age				Log Age
	Slope	R² value	F statistic	P value	Slope	R² value	F statistic	P value
Fine root biomass (g kg⁻¹ soil)	0.02	0.001	0.02	0.90	1.14	0.03	0.34	0.57
Bulk density (g cm⁻³)	−0.009	0.28	5.16	0.04	−0.12	0.32	6.31	0.03
SOC (%)	−0.03	0.01	0.15	0.70	−0.03	<0.001	0.002	0.97
TN (%)	−0.001	0.004	0.05	0.83	0.005	<0.001	0.004	0.95
Nitrate (mg kg⁻¹)	0.09	0.002	0.03	0.86	3.58	0.03	0.38	0.55
Nitrification rate (mg kg⁻¹ d⁻¹)	0.03	0.13	1.93	0.19	0.30	0.07	0.95	0.35
Ammonium (mg kg⁻¹)	−0.09	0.04	0.51	0.49	−1.72	0.11	1.55	0.24
Ammonification rate (mg kg⁻¹ d⁻¹)	−0.03	0.11	1.54	0.24	−0.47	0.15	2.25	0.16
Infiltration rate (mm h⁻¹)	54.9	0.39	9.77	0.008	678	0.45	10.6	0.006

Pasture is assumed to be 0 years post reforestation. Results from linear models with both age and log-transformed age are shown. P values in bold are significant at the 0.05 level.