Table 3.
Cumulative carbonaceous greenhouse gas emissions from incubated cores measured during rewetting and for 20 h post rewetting
| Intact cores | Homogenized cores | |||||
|---|---|---|---|---|---|---|
| n | CO 2 −C (mg) | CH 4 −C (μg) | n | CO 2 −C (mg) | CH 4 −C (μg) | |
| Field moisture | ||||||
| Simulated precipitation | 4 | 51.7 ± 19.8 c | 0.0536 ± 0.026 ab | 4 | 108.6 ± 28.2 | 0.0785 ± 0.051 |
| Simulated groundwater rise | 4 | 100.2 ± 4.1 bc | 0.0117 ± 0.005 b | 4 | 118.7 ± 45.0 | 0.0551 ± 0.016 |
| Antecedent drought | ||||||
| Simulated precipitation | 4 | 245.1 ± 17.4 a | 0.0288 ± 0.013 ab | 4 | 208.6 ± 41.7 | 0.0546 ± 0.019 |
| Simulated groundwater rise | 4 | 161.2 ± 34.5 b | 0.1032 ± 0.030 a | 3 | 202.0 ± 59.4 | 0.0418 ± 0.008 |
Letters not shared among rows show that means are significantly different using Student’s Least Significant Means t-test
Mean and standard error values for cumulative CO2−C (mg), and CH4−C (mg) from intact and homogenized soil cores maintained at field moisture content, or subjected to laboratory-induced antecedent drought for both wetting directions (i.e., wet from above to simulate precipitation or wet from below to simulate groundwater rise).