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Denitrification Losses in Response to N Fertilizer Rates—Integrating High Temporal Resolution N2O, In Situ 15N2O and 15N2 Measurements and Fertilizer 15N Recoveries in Intensive Sugarcane Systems

Takeda, Naoya; Friedl, Johannes; Kirkby, Robert; Rowlings, David; Scheer, Clemens ORCID iD icon 1; Rosa, Daniele De; Grace, Peter
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)

Abstract:

Denitrification is a key process in the global nitrogen (N) cycle, causing both nitrous oxide (N2O) and dinitrogen (N2) emissions. However, estimates of seasonal denitrification losses (N2O + N2) are scarce, reflecting methodological difficulties in measuring soil-borne N2 emissions against the high atmospheric N2 background and challenges regarding their spatio-temporal upscaling. This study investigated N2O + N2 losses in response to N fertilizer rates (0, 100, 150, 200, and 250 kg N ha1) on two intensively managed tropical sugarcane farms in Australia, by combining automated N2O monitoring, in situ N2 and N2O measurements using the 15N gas flux method and fertilizer 15N recoveries at harvest. Dynamic changes in the N2O/(N2O + N2) ratio (<0.01 to 0.768) were explained by fitting generalized additive mixed models (GAMMs) with soil factors to upscale high temporal-resolution N2O data to daily N2 emissions over the season. Cumulative N2O + N2 losses ranged from 12 to 87 kg N ha1, increasing non-linearly with increasing N fertilizer rates. Emissions of N2O + N2 accounted for 31%–78% of fertilizer 15N losses and were dominated by environmentally benign N2 emissions. ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2023
Sprache Englisch
Identifikator ISSN: 2169-8953, 2169-8961
KITopen-ID: 1000162438
HGF-Programm 12.11.22 (POF IV, LK 01) Managed ecosystems as sources and sinks of GHGs
Erschienen in Journal of Geophysical Research: Biogeosciences
Verlag John Wiley and Sons
Band 128
Heft 9
Seiten Art.: e2023JG007391
Vorab online veröffentlicht am 05.09.2023
Schlagwörter climate change, greenhouse gas, nitrogen use efficiency, NUE, N budget, N pollution
Nachgewiesen in Scopus
Dimensions
OpenAlex
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 13 – Maßnahmen zum KlimaschutzZiel 15 – Leben an Land

Verlagsausgabe §
DOI: 10.5445/IR/1000162438
Veröffentlicht am 22.09.2023
Originalveröffentlichung
DOI: 10.1029/2023JG007391
Scopus
Zitationen: 4
Web of Science
Zitationen: 2
Dimensions
Zitationen: 3
Seitenaufrufe: 105
seit 22.09.2023
Downloads: 72
seit 26.09.2023
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