Table 3.
CH4 and N2O emissions and soil organic carbon sequestration rates (SOCSR), their estimated global warming potentials (GWP), and greenhouse gas intensities (GHGI) under different water management strategies.
| Treatments | CH4 kg CH4 ha−1 yr−1 | N2O kg N2O ha−1 yr−1 | SOCSR kg C ha−1 yr−1 | Grain yield kg ha−1 yr−1 | GWP kg CO2-eqv ha−1 yr−1 | GHGI kg CO2-eqv kg−1 grain |
|---|---|---|---|---|---|---|
| F-RF | 112 ± 19 c | 0.62 ± 0.09 a | 642 ± 66 c | 8951 ± 173 b | 1646 ± 425 c | 0.18 ± 0.04 c |
| F-D-F | 376 ± 15 b | 0.29 ± 0.05 b | 1072 ± 18 b | 10244 ± 233 a | 8895 ± 513 b | 0.87 ± 0.07 b |
| CF | 805 ± 16 a | −0.01 ± 0.00 c | 1292 ± 64 a | 10886 ± 283 a | 22497 ± 593 a | 2.07 ± 0.11 a |
Mean ± SE. Different letters following each value in the same column indicate significant differences among treatments (P < 0.05). CH4 and N2O emissions were investigated over an entire annual cycle, from the 2014 fallow season to the 2015 late rice season. SOCSR was estimated from 1998 to 2014. See descriptions of CF, F-D-F, and F-RF from Table 1.