Modeling nitrous oxide emissions from irrigated agriculture : testing DayCent with high-frequency measurements

Scheer, Clemens, Del Grosso, Stephen J., Parton, William J., Rowlings, David W., & Grace, Peter R. (2014) Modeling nitrous oxide emissions from irrigated agriculture : testing DayCent with high-frequency measurements. Ecological Applications, 24(3), pp. 528-538.

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Abstract

A unique high temporal frequency dataset from an irrigated cotton-wheat rotation was used to test the agroecosystem model DayCent to simulate daily N2O emissions from sub-tropical vertisols under different irrigation intensities. DayCent was able to simulate the effect of different irrigation intensities on N2O fluxes and yield, although it tended to overestimate seasonal fluxes during the cotton season. DayCent accurately predicted soil moisture dynamics and the timing and magnitude of high fluxes associated with fertilizer additions and irrigation events. At the daily scale we found a good correlation of predicted vs. measured N2O fluxes (r2 = 0.52), confirming that DayCent can be used to test agricultural practices for mitigating N2O emission from irrigated cropping systems. A 25 year scenario analysis indicated that N2O losses from irrigated cotton-wheat rotations on black vertisols in Australia can be substantially reduced by an optimized fertilizer and irrigation management system (i.e. frequent irrigation, avoidance of excessive fertiliser application), while sustaining maximum yield potentials.

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ID Code: 71813
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: cotton–wheat cropping, DayCent, fertilizer N application rate, irrigation intensity, simulation
DOI: 10.1890/13-0570.1
ISSN: 1939-5582
Subjects: Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000)
Australian and New Zealand Standard Research Classification > AGRICULTURAL AND VETERINARY SCIENCES (070000)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Ecological Society of America
Deposited On: 19 May 2014 22:30
Last Modified: 13 Jun 2014 22:38

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