Table 4 Soil microbial community composition under different treatments.

Microbial community composition (nmol·g⁻¹)	0–10 cm		10–20 cm		20–30 cm		30–40 cm
Microbial community composition (nmol·g⁻¹)	MR	CR	MR	CR	MR	CR	MR	CR
Total bacteria	24.84 ± 2.81a	28.75 ± 2.45a	23.45 ± 3.00a	24.62 ± 2.95a	19.71 ± 1.11a	22.12 ± 2.61a	8.20 ± 1.11b	12.07 ± 1.43a
G + bacteria	12.28 ± 1.82a	14.35 ± 0.92a	13.33 ± 1.35a	12.46 ± 1.83a	11.15 ± 1.31a	11.06 ± 0.91a	5.26 ± 0.55a	6.58 ± 0.99a
G− bacteria	15.84 ± 1.61a	17.94 ± 1.67a	12.80 ± 1.17a	14.71 ± 1.47a	10.62 ± 0.89b	13.66 ± 0.97a	3.60 ± 0.54b	6.62 ± 1.01a
Actinomycetes	6.01 ± 0.38b	7.76 ± 0.79a	7.02 ± 0.73a	7.07 ± 1.34a	6.00 ± 0.89a	6.12 ± 0.53a	3.19 ± 0.34a	3.67 ± 0.47a
Fungi	3.87 ± 0.32a	3.58 ± 0.37a	2.99 ± 0.23a	3.14 ± 0.37a	2.44 ± 0.23a	2.67 ± 0.34a	0.84 ± 0.13b	1.35 ± 0.13a
F/B	0.16 ± 0.02a	0.13 ± 0.00b	0.13 ± 0.01a	0.13 ± 0.01a	0.12 ± 0.00a	0.12 ± 0.01a	0.10 ± 0.00a	0.11 ± 0.01a
G+/G−	0.77 ± 0.07a	0.80 ± 0.09a	1.04 ± 0.06a	0.85 ± 0.08a	1.05 ± 0.09a	0.81 ± 0.07b	1.46 ± 0.11a	0.99 ± 0.06b
Aerobic bacteria	9.47 ± 1.17a	9.48 ± 0.91a	7.31 ± 1.32a	8.06 ± 1.53a	5.87 ± 0.53b	7.37 ± 0.61a	1.92 ± 0.62b	3.57 ± 0.58a
Anaerobic bacteria	17.35 ± 2.62a	20.88 ± 2.26 a	19.36 ± 1.99a	18.43 ± 3.74a	16.27 ± 2.13a	16.24 ± 1.80a	8.08 ± 0.97a	9.73 ± 1.53a
Aerobe/Anaerobe	0.55 ± 0.06a	0.45 ± 0.06a	0.38 ± 0.03a	0.43 ± 0.05a	0.36 ± 0.05a	0.44 ± 0.06a	0.24 ± 0.03b	0.37 ± 0.03a
AMF	1.86 ± 0.25a	2.23 ± 0.18a	1.49 ± 0.25a	1.47 ± 0.38a	1.11 ± 0.17b	1.59 ± 0.14a	0.31 ± 0.06b	0.64 ± 0.11a

MR, rice monoculture model; CR, Integrated rice–crayfish model. G + , gram–positive bacteria, G−, gram–negative bacteria, F/B, ratio of fungal to bacterial PLFAs; G+/G−, the ratio of gram–positive to gram–negative bacteria; AMF, arbuscular mycorrhizal fungi; Aerobe/Anaerobe, the ratio of aerobic to anaerobic bacteria. Means with different letters for the same property in the same soil layer indicate significant differences at p < 0.05. Values are means ± standard errors.

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