NDLI: 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

Content Provider	Springer Nature Link
Author	Ineson, P. Coward, P.A. Hartwig, U.A.
Copyright Year	1998
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.
Starting Page	89
Ending Page	95
Page Count	7
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	198
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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