Table 3. Seasonal N2O-N emissions (Mean ± SE, kg N2O-N ha−1) in different treatments, with the percentage contribution to annual total emissions in brackets (Mean ± SE, n = 3).
| NF | FF | RR | RRF | ||
|---|---|---|---|---|---|
| 2013 | WinterFreeze-thaw periodGrowing season | 0.24 ± 0.02 (22.22) a | 0.44 ± 0.11 (21.47) a | 0.36 ± 0.08 (40.30) a | 0.55 ± 0.11 (21.01) a |
| 0.12 ± 0.02 (10.83) a | 0.23 ± 0.05 (11.33) b | 0.21 ± 0.03 (23.27) ab | 0.49 ± 0.01 (18.76) c | ||
| 0.77 ± 0.09 (70.45) a | 1.37 ± 0.04 (67.19) c | 0.33 ± 0.05 (36.43) b | 1.57 ± 0.17 (60.23) c | ||
| 2014 | WinterFreeze-thaw periodGrowing season | 0.49 ± 0.14 (34.42) ab | 0.35 ± 0.08 (16.97) ab | 0.24 ± 0.04 (31.38) a | 0.63 ± 0.11 (28.11) b |
| 0.47 ± 0.09 (33.28) bc | 0.30 ± 0.06 (14.36) ab | 0.17 ± 0.06 (22.84) a | 0.60 ± 0.06 (26.94) c | ||
| 0.46 ± 0.10 (32.30) a | 1.41 ± 0.44 (68.67) b | 0.35 ± 0.06 (45.78) a | 1.00 ± 0.19 (44.94) ab |
Different letters indicate a significant difference at the level of 0.05 among different treatments during the same season.