TABLE 2.
Diversity of bacteria among different rotational cropping systems
| Treatmentsa | Simpsonb | Chao1 | ACE | Shannon |
|---|---|---|---|---|
| 2018 | ||||
| A1 | 0.0035 ± 0.0005c Adae | 3,388.11 ± 26.26 Ba | 3,357.93 ± 35.63 Ba | 6.60 ± 0.06 Ca |
| B1 | 0.0056 ± 0.0016 Ba | 3,189.12 ± 238.05 Bab | 3,127.49 ± 225.98 Bab | 6.33 ± 0.18 Ba |
| C1 | 0.0584 ± 0.0874 Aa | 2,893.41 ± 125.37 Bb | 2,852.55 ± 105.85 Bb | 5.37 ± 1.15 Ab |
| D1 | 0.0056 ± 0.0019 Aa | 3,167.66 ± 228.99 Bab | 3,094.24 ± 240.11 Bab | 6.41 ± 0.20 Ba |
| E1 | 0.0049 ± 0.0040 Aa | 3,118.56 ± 230.33 Bab | 3,094.51 ± 191.93 Cab | 6.41 ± 0.11 Ba |
| 2019 | ||||
| A2 | 0.0104 ± 0.0102 Ab | 3,250.83 ± 237.28 Ba | 3,316.17 ± 227.62 Ba | 6.42 ± 0.30 ABa |
| B2 | 0.0324 ± 0.0161 Aa | 3,086.99 ± 91.47 Ba | 3,147.84 ± 98.55 Ba | 5.64 ± 0.18 Cb |
| C2 | 0.0054 ± 0.0014 Ab | 3,255.00 ± 162.98 Ba | 3,267.74 ± 136.45 Ba | 6.35 ± 0.22 ABa |
| D2 | 0.0045 ± 0.0001 ABb | 3,366.55 ± 132.95 Ba | 3,430.91 ± 152.01 Ba | 6.51 ± 0.04 Ba |
| E2 | 0.0045 ± 0.0009 Ab | 3,310.16 ± 146.7 Ba | 3,377.18 ± 127.79 Ba | 6.51 ± 0.08 Ba |
| 2020 | ||||
| A3 | 0.0023 ± 0.0001 Aa | 4,770.36 ± 123.35 Aa | 4,827.81 ± 95.28 Aa | 7.00 ± 0.03 Aa |
| B3 | 0.0030 ± 0.0006 Ba | 4,660.81 ± 330.56 Aa | 4,651.48 ± 399.34 Aa | 6.85 ± 0.15 Aa |
| C3 | 0.0028 ± 0.0004 Aa | 4,488.92 ± 321.16 Aa | 4,547.93 ± 390.18 Aa | 6.85 ± 0.13 Ba |
| D3 | 0.0030 ± 0.0003 Ba | 4,573.31 ± 162.01 Aa | 4,639.06 ± 138.28 Aa | 6.93 ± 0.03 Aa |
| E3 | 0.0027 ± 0.0004 Ba | 4,749.62 ± 86.62 Aa | 4,745.51 ± 44.76 Aa | 6.90 ± 0.06 Aa |
Treatments: A: milk vetch - double cropping rice → milk vetch - double cropping rice → milk vetch - double cropping rice; B: milk vetch - spring soybeans - autumn soybeans → rape - sugar-cane ‖ spring soybeans → milk vetch - double cropping rice; C: milk vetch - early rice - maize ‖ sweet potato → milk vetch - spring soybeans - autumn soybeans → milk vetch - double cropping rice; D: rape - sugarcane ‖ spring soybeans → milk vetch - early rice - maize ‖ sweet potato → milk vetch - double cropping rice; E: fallow → fallow → milk vetch - double cropping rice. “-”: multiple cropping; “‖”: intercropping.
Soil bacterial diversity index: Simpson; Chao1; ACE; Shannon.
Average ± standard deviation (n = 3).
Different letters (A, B, C) represent significant differences in different years at P < 0.05.
Different letters (a, b, c) represent significant differences among different crop rotation-fallow in 1 year at P < 0.05.