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Fluxes of nitrous oxide, methane and carbon dioxide were measured from soils under ambient (350 µL L -1 ) and enhanced (600 µL L -1 ) carbon dioxide partial pressures (pCO 2 ) at the ‘Free Air Carbon Dioxide Enrichment’ (FACE) experiment, Eidgenössische Technische Hochschule (ETH), Eschikon, Switzerland in July 1995, using a GC housed in a mobile laboratory. Measurements were made in plots of Lolium perenne maintained under high N input. During the data collection period N fertiliser was applied at a rate of 14 g m -2 of N. Elevated pCO 2 appeared to result in an increased (27%) output of N 2 O, thought to be the consequence of enhanced root-derived available soil C, acting as an energy source for denitrification. The climate, agricultural practices and soils at the FACE experiment combined to give rise to some of the largest N 2 O emissions recorded for any terrestrial ecosystem. The amount of CO 2 –C being lost from the control plot was higher (10%) than for the enhanced CO 2 plot, and is the reverse of that predicted. The control plot oxidised consistently more CH 4 than the enhanced plot, oxidising 25.5 ± 0.8 µg m -2 hr -1 of CH 4 for the control plot, with an average of 8.5 ± 0.4 µg m -2 hr -1 of CH 4 for the enhanced CO 2 plot. This suggests that elevated pCO 2 may lead to a feedback whereby less CH 4 is removed from the atmosphere. Despite the limited nature of the current study (in time and space), the observations made here on the interactions of elevated pCO 2 and soil trace gas release suggest that significant interactions are occurring. The feedbacks involved could have importance at the global scale.
Plant and Soil – Springer Journals
Published: Jan 1, 1998
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