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N2O and NO fluxes between a Norway spruce forest soil and atmosphere as affected by prolonged summer drought

Title data

Goldberg, Stefanie D. ; Gebauer, Gerhard:
N2O and NO fluxes between a Norway spruce forest soil and atmosphere as affected by prolonged summer drought.
In: Soil Biology & Biochemistry. Vol. 41 (2009) Issue 9 . - pp. 1986-1995.
ISSN 0038-0717

Abstract in another language

Global change scenarios predict an increasing frequency and duration of summer drought periods inCentral Europe especially for higher elevation areas. Our current knowledge about the effects of soildrought on nitrogen trace gas fluxes from temperate forest soils is scarce. In this study, the effects ofexperimentally induced drought on soil N2O and NO emissions were investigated in a mature Norwayspruce forest in the Fichtelgebirge (northeastern Bavaria, Germany) in two consecutive years. Droughtwas induced by roof constructions over a period of 46 days. The experiment was run in three replicatesand three non-manipulated plots served as controls. Additionally to the N2O and NO flux measurementsin weekly to monthly intervals, soil gas samples from six different soil depths were analysed in timeseries for N2O concentration as well as isotope abundances to investigate N2O dynamics within the soil.N2O fluxes from soil to the atmosphere at the experimental plots decreased gradually during the droughtperiod from 0.2 to -0.0 mmol m-2 h-1, respectively, and mean cumulative N2O emissions from themanipulated plots were reduced by 43% during experimental drought compared to the controls in 2007.N2O concentration as well as isotope abundance analysis along the soil profiles revealed that a major partof the soil acted as a net sink for N2O, even during drought. This N2O sink, together with diminished N2Oproduction in the organic layers, resulted in successively decreased N2O fluxes during drought, and mayeven turn this forest soil into a net sink of atmospheric N2O as observed in the first year of the experiment.Enhanced N2O fluxes observed after rewetting up to 0.1 mmol m-2 h-1 were not able tocompensate for the preceding drought effect. During the experiment in 2006, with soil matric potentialsin 20 cm depth down to -630 hPa, cumulative NO emissions from the throughfall exclusion plots werereduced by 69% compared to the controls, whereas cumulative NO emissions from the experimental plotsin 2007, with minimum soil matric potentials of -210 hPa, were 180% of those of the controls. Followingwetting, the soil of the throughfall exclusion plots showed significantly larger NO fluxes compared to thecontrols (up to 9 mmol m-2 h-1 versus 2 mmol m-2 h-1). These fluxes were responsible for 44% of the totalemission of NO throughout the whole course of the experiment. NO emissions from this forest soilusually exceeded N2O emissions by one order of magnitude or more except during wintertime.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER72297
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 07 Aug 2015 06:59
Last Modified: 09 Aug 2022 09:09