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Varietal effects on methane intensity of paddy fields under different irrigation management

Asch, F.; Johnson, K.; Vo, T. B. T.; Sander, B. O.; Duong, V. N.; Wassmann, R. 1,2
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)
2 Zukunftscampus (CAMPUS), Karlsruher Institut für Technologie (KIT)

Abstract:

Alternate wetting and drying irrigation (AWD) has been shown to decrease water use and trace gas emissions from paddy fields. Whereas genotypic water use shows little variation, it has been shown that rice varieties differ in the magnitude of their methane emissions. Management and variety-related emission factors have been proposed for modelling the impact of paddy production on climate change; however, the magnitude of a potential reduction in greenhouse gas emissions by changing varieties has not yet been fully assessed. AWD has been shown to affect genotypic yields and high-yielding varieties suffer the greatest loss when grown under AWD. The highest yielding varieties may not have the highest methane emissions; thus, a potential yield loss could be compensated by a larger reduction in methane emissions. However, AWD can only be implemented under full control of irrigation water, leaving the rainy seasons with little scope to reduce methane emissions from paddy fields. Employing low-emitting varieties during the rainy season may be an option to reduce methane emissions but may compromise farmers’ income if such varieties perform less well than the current standard. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000161013
Veröffentlicht am 28.07.2023
Originalveröffentlichung
DOI: 10.1111/jac.12662
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0931-2250, 1439-037X
KITopen-ID: 1000161013
HGF-Programm 12.11.22 (POF IV, LK 01) Managed ecosystems as sources and sinks of GHGs
Erschienen in Journal of Agronomy and Crop Science
Verlag John Wiley and Sons
Band 209
Heft 6
Seiten 876-886
Vorab online veröffentlicht am 06.07.2023
Schlagwörter AWD, carbon footprint, farmers compensation, greenhouse gases, lowland rice
Nachgewiesen in Scopus
Dimensions
Web of Science
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