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Soil gas fluxes of N 2 O, CH 4 and CO 2 beneath Lolium perenne under elevated CO 2 : The Swiss free air carbon dioxide enrichment experiment

Soil gas fluxes of N 2 O, CH 4 and CO 2 beneath Lolium perenne under elevated CO 2 : The Swiss... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant and Soil Springer Journals

Soil gas fluxes of N 2 O, CH 4 and CO 2 beneath Lolium perenne under elevated CO 2 : The Swiss free air carbon dioxide enrichment experiment

Plant and Soil , Volume 198 (1) – Jan 1, 1998

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References (19)

Publisher
Springer Journals
Copyright
Copyright © 1998 by Kluwer Academic Publishers
Subject
Environment; Ecology; Plant Sciences; Plant Physiology; Soil Science & Conservation
ISSN
0032-079X
eISSN
1573-5036
DOI
10.1023/A:1004298309606
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Plant and SoilSpringer Journals

Published: Jan 1, 1998

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