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Klier, C. ; Gayler, S. ; Haberbosch, C. ; Ruser, R.* ; Stenger, R.* ; Flessa, H.* ; Priesack, E.

Modeling nitrous oxide emissions from potato-cropped soil.

Vadose Zone J. 10, 184-194 (2011)
DOI
Intensive agricultural land use is considered to be the major source of the anthropogenic contribution to the increase in atmospheric N(2)O concentration during the last decades. A reduction of anthropogenic N(2)O emissions therefore requires a change in agricultural management practices. Mathematical models help to understand interacting processes in the N cycle and state variables affecting N(2)O emissions. The aim of this study was to test two modeling approaches for their ability to describe and quantify the seasonal variations of N(2)O fluxes in a potato (Solanum tuberosum L.)-cropped soil. Model 1 assumes a fixed N(2)O/N(2) ratio for N(2)O production and neglects the transport of N(2)O in the soil profile; Model 2 explicitly considers N(2)O transport and assumes a dynamic reduction of N(2)O to N(2). Data for model evaluation came from an experiment where N(2)O fluxes were monitored during the vegetation period using a closed chamber technique. Generally, both modeling approaches were able to describe the observed seasonal dynamics of N(2)O emissions and events of high N(2)O emissions due to increased denitrification activity after heavy precipitation. The inclusion of a gas transport module in the modeling approach resulted in simulated N(2)O emission dynamics showing a smoother transient behavior. Extremely high emission rates from the interrow soil of the potato field were underestimated by both models. The lower N(2)O release from the ridge soil was mainly due to better aeration because of a lower soil bulk density and lower water contents caused by lateral runoff and root water uptake.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords N2O emissions; Carbon-dioxide; Arable soils; Nitric-oxide; CH4 fluxes; Denitrification; Water; Simulation; Nitrate; System
ISSN (print) / ISBN 1539-1663
e-ISSN 1539-1663
Journal Vadose Zone Journal
Quellenangaben Volume: 10, Issue: 1, Pages: 184-194 Article Number: , Supplement: ,
Publisher Soil Science Society of America
Publishing Place Madison, Wis.
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Soil Ecology (IBOE)