Note: SOC: soil organic carbon; DOC: soil dissolved organic carbon; MBC:
microbial biomass carbon; LFOC: light fraction organic carbon; HFOC:
heavy organic carbon. The numeric values represent mean ± standard
deviation. Different lowercase letters in a column indicate differences
among treatments (P < 0.05), respectively.Table 2 The soil organic nitrogen and labile organic nitrogen
components under different straw returned.