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Management Intensity Controls Nitrogen-Use-Efficiency and Flows in Grasslands—A $^{15}$N Tracing Experiment

Zistl-Schlingmann, Marcus; Kwatcho Kengdo, Steve; Kiese, Ralf; Dannenmann, Michael

Abstract:
The consequences of land use intensification and climate warming on productivity, fates of fertilizer nitrogen (N) and the overall soil N balance of montane grasslands remain poorly understood. Here, we report findings of a $^{15}$N slurry-tracing experiment on large grassland plant–soil lysimeters exposed to different management intensities (extensive vs. intensive) and climates (control; translocation: +2 °C, reduced precipitation). Surface-applied cattle slurry was enriched with both $^{15}$NH$_{4}$+ and $^{15}$N-urea in order to trace its fate in the plant–soil system. Recovery of 15N tracer in plants was low (7–17%), while it was considerably higher in the soil N pool (32–42%), indicating N stabilization in soil organic nitrogen (SON). Total $^{15}$N recovery was only 49% ± 7% indicating substantial fertilizer N losses to the environment. With harvest N exports exceeding N fertilization rates, the N balance was negative for all climate and management treatments. Intensive management had an increased deficit relative to extensive management. In contrast, simulated climate change had no significant effects on the grassland N balance. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120262
Veröffentlicht am 18.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2073-4395
KITopen-ID: 1000120262
HGF-Programm 12.02.01 (POF III, LK 01)
Effects of land use and climate change
Erschienen in Agronomy
Band 10
Heft 4
Seiten Art.-Nr.: 606
Vorab online veröffentlicht am 23.04.2020
Schlagwörter $^{15}$N tracing; nitrogen-use-efficiency; nitrogen balance; montane grasslands; climate change; management intensity
Nachgewiesen in Scopus
Web of Science
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