Table 2. The properties of pot soil before N addition treatment.

	SOC (mg kg−1)	N (mg kg−1)	P (mg kg−1)	AP (mg kg−1)	N/P
Mean	32230	1080	220	3.061	4.960
n	50	50	50	5	50
s.d.	3661	140	30	1.25	0.54