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Evaluating the Potential of Legumes to Mitigate N$_{2}$O Emissions From Permanent Grassland Using Process-Based Models

Fuchs, Kathrin; Merbold, L.; Buchmann, N.; Bellocchi, G.; Bindi, M.; Brilli, L.; Conant, R. T.; Dorich, C. D.; Ehrhardt, F.; Fitton, N.; Grace, P.; Klumpp, K.; Liebig, M.; Lieffering, M.; Martin, R.; McAuliffe, R.; Newton, P. C. D.; Rees, R. M.; Recous, S.; Smith, P.; ... mehr

Abstract:
A potential strategy for mitigating nitrous oxide (N$_{2}$O) emissions from permanent grasslands is the partial substitution of fertilizer nitrogen (N$_{fert}$) with symbiotically fixed nitrogen (N$_{symb}$) from legumes. The input of N$_{symb}$ reduces the energy costs of producing fertilizer and provides a supply of nitrogen (N) for plants that is more synchronous to plant demand than occasional fertilizer applications. Legumes have been promoted as a potential N$_{2}$O mitigation strategy for grasslands, but evidence to support their efficacy is limited, partly due to the difficulty in conducting experiments across the large range of potential combinations of legume proportions and fertilizer N inputs. These experimental constraints can be overcome by biogeochemical models that can vary legume‐fertilizer combinations and subsequently aid the design of targeted experiments. Using two variants each of two biogeochemical models (APSIM and DayCent), we tested the N$_{2}$O mitigation potential and productivity of full factorial combinations of legume proportions and fertilizer rates for five temperate grassland sites across the globe. Both models showed that replacing fertilizer with legumes reduced N$_{2}$O emissions without reducing productivity across a broad range of legume‐fertilizer combinations. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129089
Frei zugänglich ab 01.07.2021
Originalveröffentlichung
DOI: 10.1029/2020GB006561
Scopus
Zitationen: 1
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 0886-6236, 1944-9224
KITopen-ID: 1000129089
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Global biogeochemical cycles
Verlag Wiley
Band 34
Heft 12
Seiten e2020GB006561
Nachgewiesen in Scopus
Dimensions
Web of Science
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