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Cold season soil NO fluxes from a temperate forest : Drivers and contribution to annual budgets

Medinets, S.; Gasche, R.; Skiba, U.; Schindlbacher, A.; Kiese, R.; Butterbach-Bahl, K.

Abstract:
Soils, and here specifically acidic forest soils exposed to high rates of atmospheric nitrogen deposition, are a significant source for the secondary greenhouse gas nitric oxide (NO). However, as flux estimates are mainly based on measurements during the vegetation period, annual NO emissions budgets may hold uncertainty as cold season soil NO fluxes have rarely been quantified. Here we analyzed cold season soil NO fluxes and potential environmental drivers on the basis of the most extensive database on forest soil NO fluxes obtained at the Höglwald Forest, Germany, spanning the years 1994 to 2010. On average, the cold season (daily average air temperature <3 °C) contributed to 22% of the annual soil NO budget, varying from 13% to 41% between individual cold seasons. Temperature was the main controlling factor of the cold season NO fluxes, whereas during freeze-thaw cycles soil moisture availability determined NO emission rates. The importance of cold season soil NO fluxes for annual NO fluxes depended positively on the length of the cold season, but responded negatively to frost events. Snow cover did not significantly affect co ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1088/1748-9326/11/11/114012
ISSN: 1748-9318, 1748-9326
URN: urn:nbn:de:swb:90-653390
KITopen ID: 1000065339
HGF-Programm 12.02.01; LK 01
Erschienen in Environmental research letters
Band 11
Heft 11
Seiten 114012
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
Schlagworte nitric oxide, N₂O, CO₂, freeze-thaw, snow
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