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Fluxes of climate-relevant trace gases between a Norway spruce forest soil and atmosphere during repeated freeze-thaw cycles in mesocosms

Titelangaben

Goldberg, Stefanie D. ; Muhr, Jan ; Borken, Werner ; Gebauer, Gerhard:
Fluxes of climate-relevant trace gases between a Norway spruce forest soil and atmosphere during repeated freeze-thaw cycles in mesocosms.
In: Journal of Plant Nutrition and Soil Science. Bd. 171 (2008) Heft 5 . - S. 729-739.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.200700317

Abstract

For this century, an increasing frequency of extreme meteorological boundary conditions isexpected, presumably resulting in a changing frequency of freezing and thawing of soils inhigher-elevation areas. Our current knowledge about the effects of these events on trace-gasemissions from soils is scarce. In this study, the effects of freeze–thaw events on the fluxes ofthe trace gases CO2, N2O, and NO between soil and atmosphere were investigated in a laboratoryexperiment. Undisturbed soil columns were collected from a mature Norway spruce forestin the “Fichtelgebirge”, SE Germany. The influence of freezing temperatures (–3°C, –8°C,–13°C) on gas fluxes was studied during the thawing periods (+5°C) in three freeze–thaw cycles(FTCs) and compared to unfrozen controls (+5°C).Two different types of soil columns were examined in parallel—one consisting of O layer only (Ocolumns) and one composed of O layer and mineral soil horizons (O+M columns)—to quantifythe contribution of the organic layer and the top mineral soil to the production or consumption ofthese trace gases.During the thawing period, we observed increasing emissions of CO2, N2O, and NO from thespruce forest soil, but the cumulative emissions of these gases did mostly not exceed the levelof the controls. The results show that the O layers were mainly involved in the gas production.Severe soil frost increased CO2 fluxes during soil thawing, whereas repetition of the freeze–thawevents decreased CO2 fluxes from the thawing soil. Fluxes of N2O and NO were neither influencedby freezing temperature nor by freeze–thaw repetition.Stable-isotope analysis indicated that denitrification was mostly responsible for the N2O productionin the FTC columns. Furthermore, isotope data demonstrated a consumption of N2Othrough microbial denitrification to N2. It was further shown, that production of N2O also occurredin the mineral horizons. The NO emissions were mainly driven by increasing soil temperatureduring thawing. In this freeze–thaw experiment up to 20 times higher NO than N2O fluxes wererecorded. Our results suggest that topsoil thawing has little potential to increase the emissionsof CO2, N2O, and NO in spruce forest soils.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER58330
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 11 Sep 2015 06:32
Letzte Änderung: 11 Sep 2015 06:32
URI: https://eref.uni-bayreuth.de/id/eprint/19093