TY - JOUR
T1 - High-resolution dynamics of available N in a grassland ecosystem under a multiple climate manipulation experiment
AU - Deltedesco, Evi
AU - Inselsbacher, Erich
AU - Gorfer, Markus
AU - Zechmeister-Boltenstern, Sophie
AU - Keiblinger, Katharina
AU - Potsch, Erich M.
PY - 2023/5
Y1 - 2023/5
N2 - Nitrogen (N) is the most important limiting nutrient for plants and soil microorganisms in almost all ecosystems. Global environmental changes significantly affect the terrestrial N cycle but implications for plant available N in-situ remain unclear. Here, we investigated the simultaneous effect of elevated atmospheric CO2, an increase in temperature and a drying-rewetting event on diffusive N fluxes in soil of a managed permanent grassland at the multifactor climate manipulation experimental site ClimGrass (Austria) using microdialysis. Rewetting caused a significant, but short-lived increase in diffusive NH4+ and NO3− fluxes, which subsequently dropped until the end of the experiment. Harvesting induced a significant increase in diffusive NH4+ fluxes in the drying-rewetting treatments. However, elevated CO2 and soil warming had little effect on diffusive N fluxes. Our study suggests that more frequent soil drying-rewetting cycles associated with increased extreme weather events are uppermost among the climate change drivers affecting soil N availability.
AB - Nitrogen (N) is the most important limiting nutrient for plants and soil microorganisms in almost all ecosystems. Global environmental changes significantly affect the terrestrial N cycle but implications for plant available N in-situ remain unclear. Here, we investigated the simultaneous effect of elevated atmospheric CO2, an increase in temperature and a drying-rewetting event on diffusive N fluxes in soil of a managed permanent grassland at the multifactor climate manipulation experimental site ClimGrass (Austria) using microdialysis. Rewetting caused a significant, but short-lived increase in diffusive NH4+ and NO3− fluxes, which subsequently dropped until the end of the experiment. Harvesting induced a significant increase in diffusive NH4+ fluxes in the drying-rewetting treatments. However, elevated CO2 and soil warming had little effect on diffusive N fluxes. Our study suggests that more frequent soil drying-rewetting cycles associated with increased extreme weather events are uppermost among the climate change drivers affecting soil N availability.
KW - Amino acids
KW - Climate change
KW - Drying-rewetting
KW - Extreme weather event
KW - Harvest
KW - Microdialysis
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=ait_230127_woslite_expandedapikey&SrcAuth=WosAPI&KeyUT=WOS:000925135500001&DestLinkType=FullRecord&DestApp=WOS
U2 - 10.1016/j.apsoil.2023.104803
DO - 10.1016/j.apsoil.2023.104803
M3 - Artikel
SN - 0929-1393
VL - 185
JO - Applied Soil Ecology
JF - Applied Soil Ecology
M1 - 104803
ER -