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Mechanisms behind high N2O emissions from livestock enclosures in Kenya revealed by dual-isotope and functional gene analyses

Fang, Xiantao; Harris, Stephen J.; Leitner, Sonja Maria; Butterbach-Bahl, Klaus 1; Conz, Rafaela Feola; Merbold, Lutz; Dannenmann, Michael ORCID iD icon 1; Oyugi, Antony; Liu, Shuwei; Zou, Jianwen; Six, Johan; Barthel, Matti
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)

Abstract:

Livestock manure contributes to global warming due to greenhouse gas (GHG) emissions, especially nitrous oxide (N2O) and methane (CH4). In the arid and semi-arid lands of Sub-Saharan Africa (SSA), extensive pastoral grazing systems are common, with cattle grazing in the savanna during the day and kept in enclosures (called bomas in Kenya) during the night. Manure is usually not removed from bomas but left to accumulate, leading to excessive local nitrogen loads, making these bomas an overlooked N2O emission hotspot in SSA that is currently not accounted for in national and regional GHG budgets. Here, we present the first in-situ isotope measurements of N2O fluxes from 37 cattle bomas along an age gradient ranging from 0 to 5 years after boma abandonment in Kenya along with functional gene analysis of soil and manure samples. The isotopic composition of the emitted N2O from bomas suggests that on average 91 ± 8% N2O was produced via bacterial denitrification and/or nitrifier denitrification, with little variation across boma age class. We also found high levels of N2O reduction to N2 across all sample sites (81 ± 9%), indicating high levels of N2O consumption. ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2024
Sprache Englisch
Identifikator ISSN: 0038-0717, 1879-3428
KITopen-ID: 1000172435
HGF-Programm 12.11.22 (POF IV, LK 01) Managed ecosystems as sources and sinks of GHGs
Erschienen in Soil Biology and Biochemistry
Verlag Elsevier
Band 196
Seiten Art.-Nr.: 109505
Vorab online veröffentlicht am 21.06.2024
Schlagwörter N2O, Boma, Dual isotope mapping approach, Site preference, Functional genes
Nachgewiesen in OpenAlex
Dimensions
Scopus
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 2 – Kein HungerZiel 13 – Maßnahmen zum Klimaschutz

Verlagsausgabe §
DOI: 10.5445/IR/1000172435
Veröffentlicht am 16.07.2024
Seitenaufrufe: 47
seit 16.07.2024
Downloads: 27
seit 16.07.2024
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