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Table 1 Total phospholipid fatty acids (PLFAs) (mg C kg-1) in paddy soil under fertilization regimes at different soil depths (mean± SE, n=3). Statistical significances based on one-way analysis of variance and Duncan’s test (P< 0.05). Different lower-case letters represent significant differences in soil depth within a fertilization regime. Different uppercase letters represent significant differences in fertilization regime within soil depth. Fame: fatty acid methyl esters; CK: no fertilizer; NPK: chemical fertilizers; ST: rice straw combined with chemical fertilizers; OM: 70% NPK + 30% chicken manure. G−: Gram-negative bacteria; G+: Gram-positive bacteria.