Figure captions:
Fig. 1. The alpha-diversity of soil bacteria (A) and fungi (B) under different straw returned.
Fig. 2. The relative abundance of dominant bacterial and fungal communities at phylum and genus levels under different straw returned.
Fig. 3. The bidirectional cluster analysis of 31 carbon sources utilized by soil microorganisms under different straw returned.
Fig. 4. The redundancy analysis (RDA) of soil carbon and nitrogen components and soil microorganisms.
Fig. 5. The heat map analysis of correlation between soil carbon and nitrogen components and soil microorganisms.
Fig. 6. The partial least squares pathway model (PLS-PM) shows the direct and indirect effects of straw return, soil bacteria, fungi and soil carbon metabolism capacity on soil carbon and nitrogen components.
Table 1 The soil organic carbon and labile organic carbon components under different straw returned.