Figure captions
FIGURE 1 Microbial community changes to the (a)ratio of fungal to bacterial phospholipid fatty acids (PLFAs); (b) ratio of gram-positive to gram-negative bacterial PLFAs; (c) ratio of gram-positive to actinomycetes PLFAs; and (d) ratio of fungal to gram-negative bacterial PLFAs in paddy soil under fertilization regimes at different soil depths. CK: no fertilizer; NPK: chemical fertilizers; NPK + ST: rice straw combined chemical fertilizers; NPK + OM: 70% NPK + 30% chicken manure. Statistical significance is based on a one-way analysis of variance and Duncan’s test (P< 0.05). Different lower-case letters represent significant differences in soil depths within a fertilization regime. Different uppercase letters represent significant differences in fertilization regimes within a soil depth (n= 3)
FIGURE 2 (a) Soil respiration rate and (b) soil metabolic quotient (qCO2) in paddy soil under fertilization regimes at different soil depths. CK: no fertilizer; NPK: chemical fertilizers; NPK + ST: rice straw combined with chemical fertilizers; NPK + OM: 70% NPK + 30% chicken manure. Statistical significance is based on a one-way analysis of variance and Duncan’s test (P< 0.05). Different lower-case letters represent significant differences in soil depths within a fertilization regime. Different uppercase letters represent significant differences in fertilization regimes within a soil depth (n= 3)
FIGURE 3 Redundancy analysis of phospholipid fatty acid content from soil samples at different depths. (a) 0–40 cm; (b) 0–20 cm; (c) 20–40 cm. Shapes represent the type of fertilizer, while colours represent the different soil depths. CK: no fertilizer; NPK: chemical fertilizers; NPK + ST: rice straw combined with chemical fertilizers; NPK + OM: 70% NPK + 30% chicken manure. 0–10 cm (black), 10–20 cm (red), 20–30 cm (yellow), and 30–40cm (orange)