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Effects of drought on nitrogen turnover and abundances of ammonia-oxidizers in mountain grassland

Fuchslueger, L.; Kastl, E.-M.; Bauer, F.; Kienzl, S.; Hasibeder, R.; Ladreiter-Knauss, T.; Schmitt, M.; Bahn, M.; Schloter, M.; Richter, A.; Szukics, U.

Future climate scenarios suggest an increased frequency of summer drought periods in the European Alpine Region. Drought can affect soil nitrogen (N) cycling, by altering N transformation rates, as well as the abundances of ammonia-oxidizing bacteria and archaea. However, the extent to which drought affects N cycling under in situ conditions is still controversial. The goal of this study was to analyse effects of drought on soil N turnover and ammoniaoxidizer abundances in soil without drought history. To this end we conducted rain-exclusion experiments at two differently managed mountain grassland sites, an annually mown and occasionally fertilized meadow and an abandoned grassland. Soils were sampled before, during and after drought and were analysed for potential gross rates of N mineralization, microbial uptake of inorganic N, nitrification, and the abundances of bacterial and archaeal ammonia-oxidizers based on gene copy numbers of the amoA gene (AOB and AOA, respectively). Drought induced different responses at the two studied sites. At the managed meadow drought increased NH+/4 immobilization rates and NH+/4 concentrations in ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000049268
Veröffentlicht am 24.05.2018
DOI: 10.5194/bg-11-6003-2014
Zitationen: 17
Web of Science
Zitationen: 17
Seitenaufrufe: 28
seit 11.05.2018
Downloads: 27
seit 04.06.2018
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1726-4170, 1726-4189
KITopen-ID: 1000049268
HGF-Programm 12.02.02 (POF II, LK 01)
Erschienen in Biogeosciences
Band 11
Heft 21
Seiten 6003-6015
Nachgewiesen in Web of Science
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