. 2022 Mar 7;10:e12739. doi: 10.7717/peerj.12739

Table 2. Differences in soil physicochemical properties of the top soil layer (0–20 cm) under different proportion degree.

Proportion degree	pH	SOC (g kg⁻¹)	TN (g kg⁻¹)	TP (g kg⁻¹)	AN (mg kg⁻¹)	AP (mg kg⁻¹)	SWC (%)	TK (g kg⁻¹)	AK (mg kg⁻¹)
H	5.58 ± 0.06^c	13.89 ± 0.25^c	1.73 ± 0.01^a	0.44 ± 0.02^a	127.9 ± 2.13^c	0.79 ± 0.04^a	0.29 ± 0.02^a	18.21 ± 0.20^a	98.76 ± 0.21^b
M	5.70 ± 0.05^b	18.34 ± 0.41^a	1.66 ± 0.04^b	0.45 ± 0.02^a	160.1 ± 3.52^a	0.78 ± 0.07^a	0.16 ± 0.01^b	17.54 ± 0.11^b	114.70 ± 0.16^b
L	5.73 ± 0.02^b	16.92 ± 0.43^b	1.42 ± 0.02^c	0.43 ± 0.01^a	169.9 ± 4.73^a	1.05 ± 0.32^a	0.12 ± 0.01^c	17.12 ± 0.23^b	116.91 ± 0.20^b
N	5.87 ± 0.01^a	13.84 ± 0.18^c	1.40 ± 0.01^c	0.40 ± 0.01^a	173.1 ± 2.01^a	1.11 ± 0.02^a	0.11 ± 0.01^c	15.64 ± 0.18^c	194.66 ± 0.28^a
P value	0.001	0.004	0.001	0.981	0.001	0.56	0.036	0.025	0.552

Notes.

The data of different lowercase letters in the vertical row (mean and standard error) showed significant difference (P < 0.05).

Abbreviations

H: High proportion (C. japonica account for 60% of the total plant individuals in the whole stand)
M: Moderate proportion (C. japonica account for 30% of the total plant individuals in the whole stand)
L: Low proportion (C. japonica account for 10% of the total plant individuals in the whole stand)
N: No proportion (no C. japonica)
SOC: soil organic carbon
TN: total nitrogen
TP: total phosphorus
TK: total potassium
AN: available nitrogen
AP: available phosphorus
AK: available potassium
SWC: soil water content