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A System for Studying the Dynamics of Gaseous Emissions in Response to Changes in Soil Matric Potential

^a Vito, Boeretang 200, 2400 Mol, Belgium
^b Lab. for Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium

View larger version (34K): [in a new window]   Fig. 1. Incubation system showing the union of incubation chambers with the automated gas sampling system. Incubation Chamber 1 is selected by the 10-port valve, which allows gaseous recirculation by the membrane pump before sampling by the sample loops.

View larger version (19K): [in a new window]   Fig. 2. Relationship between soil water contents and matric potential, established for four soils of the Lovenjoel transect. Each point represents three replicate soils and three determinations for a given matric potential.

View larger version (20K): [in a new window]   Fig. 3. Comparison of water release curves determined with traditional ceramic plate and pressure chambers or with the incubation chambers. For the less structured soils each point represents the mean of eight duplicate soils, for the well-structured soils the mean of six duplicate soils.

View larger version (24K): [in a new window]   Fig. 4. Cumulative production of N gases and CO2 (average of three replicates) during anaerobic incubation of Soil 2 preincubated at –75 kPa. The arrows indicate the increases in matric potential.

View larger version (50K): [in a new window]   Fig. 5. Partially oxidized species of gaseous N (NO + N2O) as a proportion of total gaseous N emissions. Legend refers to matric potential during anaerobic incubation and x-axis refers to aerobic preincubation matric potential.

View larger version (31K): [in a new window]   Fig. 6. Average production rates of (a) NO, (b) N2O (c) N2, and (d) CO2 in soils anaerobically incubated during 7 d at three different matric potentials, after a 90-d aerobic preincubation at –75 kPa.

View larger version (32K): [in a new window]   Fig. 7. Average effect of incubation matric potential on (a) total gaseous N emission, (b) electrons consumed (c) NO + N2O as a proportion of total N gases, and (d) electrons consumed per unit CO2 produced. Both soils were preincubated aerobically at –75 kPa and then incubated anaerobically for 7 d at three different matric potentials.