Table 3 Cumulative carbonaceous greenhouse gas emissions from incubated cores measured during rewetting and for 20 h post rewetting

From: Shifts in pore connectivity from precipitation versus groundwater rewetting increases soil carbon loss after drought

 

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

  1. Letters not shared among rows show that means are significantly different using Student’s Least Significant Means t-test
  2. 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).
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