Table 2. Summary of the linear mixed model showing the effects of soil layer, trees species and sampling time on the C:N, N:P and C:P of soil.

Variables	Depth (D)			Tree species (TS)			Time (T)			D × TS			TS × T			D × TS × T
	d.f.	F	P	d.f.	F	P	d.f.	F	P	d.f.	F	P	d.f.	F	P	d.f.	F	P
C:N	2	26.85	<0.001	3	2.04	0.12	1	41.88	<0.001	6	2.91	0.02	3	0.61	0.61	6	2.07	0.07
N:P	2	53.15	<0.001	3	27.02	<0.001	1	0.00	0.99	6	7.18	<0.001	3	1.01	0.40	6	1.35	0.25
C:P	2	104.03	<0.001	3	24.27	<0.001	1	23.47	<0.001	6	7.18	<0.001	3	1.90	0.14	6	1.19	0.33