Response of Bacterial Community Structure in the Bulk Soil and Rice Straw Residues under Different Crop Rotation Systems

Figure 4

The UPGMA (a) and PCA (b) analyses of DGGE patterns of the bacterial community in the bulk soil (S) and those colonizing rice straw restudies (RS) at day 30 (above) and day 50 (below) of incubation of the different microcosm set-ups. In the UPGMA clustering, the marks mentioned before the indicated microcosm setup as follows: S1–S3: bulk soil of SR-AN; S4–S6: bulk soil of SR-AE; S7–S9: bulk soil of SB-AN; and S10–S12: bulk soil of SB-AN. RS1–RS3: rice straw residues of SR-AN; RS4–RS6: rice straw residues of SR-AE; RS7–RS9: rice straw residues of SB-AN; and RS10–RS12: rice straw residues of SB-AE. In PCA and UPGMA analysis, the symbol corresponds with a particular microcosm setup as follows: (solid triangle) RS-SR-AN; (open triangle) S-SR-AN; (solid diamond) RS-SR-AE; (open diamond) S-SR-AE; (solid circle) RS-SB-AN; (open circle) S-SB-AN; (solid square) RS-SB-AE and (open square) S-SB-AE.

(a)

(b)