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Dinitrogen (N2) pulse emissions during freeze-thaw cycles from montane grassland soil

Wu, Xing; Chen, Zhe; Kiese, Ralf; Fu, Jin; Gschwendter, Silvia; Schloter, Michael; Liu, Chunyan; Butterbach-Bahl, Klaus; Wolf, Benjamin; Dannenmann, Michael

Abstract:
Short-lived pulses of soil nitrous oxide (N$_{2}$O) emissions during freeze-thaw periods can dominate annual cumulative N$_{2}$O fluxes from temperate managed and natural soils. However, the effects of freeze thaw cycles (FTCs) on dinitrogen (N$_{2}$) emissions, i.e., the dominant terminal product of the denitrification process, and ratios of N$_{2}$/N$_{2}$O emissions have remained largely unknown because methodological difficulties were so far hampering detailed studies. Here, we quantified both N$_{2}$ and N$_{2}$O emissions of montane grassland soils exposed to three subsequent FTCs under two different soil moisture levels (40 and 80% WFPS) and under manure addition at 80% WFPS. In addition, we also quantified abundance and expression of functional genes involved in nitrification and denitrification to better understand microbial drivers of gaseous N losses. Our study shows that each freeze thaw cycle was associated with pulse emissions of both N$_{2}$O andN$_{2}$, with soil N$_{2}$ emissions exceeding N$_{2}$O emissions by a factor of 5–30. Increasing soil moisture from 40 to 80% WFPS and addition of cow slurry increased the cumulative FTC N$_{2}$ emissions by 102% and 77%, respectively. ... mehr

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Postprint §
DOI: 10.5445/IR/1000120133
Veröffentlicht am 10.06.2020
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: 0178-2762, 1432-0789
KITopen-ID: 1000120133
HGF-Programm 12.02.01 (POF III, LK 01)
Effects of land use and climate change
Erschienen in Biology and fertility of soils
Vorab online veröffentlicht am 23.05.2020
Schlagwörter Freeze-thawcycles, Dinitrogen, Nitrous oxide, Denitrification, Functional genes,Soil moisture, Fertilization
Nachgewiesen in Web of Science
Scopus
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