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Intensive slurry management and climate change promote nitrogen mining from organic matter-rich montane grassland soils

Schlingmann, Marcus; Tobler, Ursina; Berauer, Bernd; Garcia-Franco, Noelia; Wilfahrt, Peter; Wiesmeier, Martin; Jentsch, Anke; Wolf, Benjamin; Kiese, Ralf; Dannenmann, Michael

Consequences of climate change and land use intensification on the nitrogen (N) cycle of organic-matter rich grassland soils in the alpine region remain poorly understood. We aimed to identify fates of fertilizer N and to determine the overall N balance of an organic-matter rich grassland in the European alpine region as influenced by intensified management and warming.
We combined 15N cattle slurry labelling with a space for time climate change experiment, which was based on translocation of intact plant-soil mesocosms down an elevational gradient to induce warming of +1 °C and + 3 °C. Mesocosms were subject to either extensive or intensive management. The fate of slurry-N was traced in the plant-soil system.
Grassland productivity was very high (8.2 t - 19.4 t dm ha$^{-1}$ yr$^{-1}$), recovery of slurry $^{15}$N in mowed plant biomass was, however, low (9.6–14.7%), illustrating low fertilizer N use efficiency and high supply of plant available N via mineralization of soil organic matter (SOM). Higher 15N recovery rates (20.2–31.8%) were found in the soil N pool, dominated by recovery in unextractable N. Total $^{15}$N recovery was approximately half of the applied tracer, indicating substantial loss to the environment. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000124656
Veröffentlicht am 15.10.2020
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: 0032-079X, 1573-5036
KITopen-ID: 1000124656
Erschienen in Plant and soil
Vorab online veröffentlicht am 04.09.2020
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Nachgewiesen in Scopus
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