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Repeated drying-rewetting cycles and their effects on the emission of CO2, N2O, NOx and CH4 in a forest soil

Title data

Muhr, Jan ; Goldberg, Stefanie D. ; Borken, Werner ; Gebauer, Gerhard:
Repeated drying-rewetting cycles and their effects on the emission of CO2, N2O, NOx and CH4 in a forest soil.
In: Journal of Plant Nutrition and Soil Science. Vol. 171 (2008) Issue 5 . - pp. 719-728.
ISSN 1436-8730
DOI: https://doi.org/10.1002/jpln.200700302

Abstract in another language

Prolonged summer droughts due to climate change are expected for this century, but little isknown about the effects of drying and wetting on biogenic trace-gas fluxes of forest soils. Here,the response of CO2, N2O, NO, and CH4 fluxes from temperate forest soils towards drying–wettingevents has been investigated, using undisturbed soil columns from a Norway spruce forestin the “Fichtelgebirge”, Germany. Two different types of soil columns have been used for thisstudy to quantify the contribution of organic and mineral horizons to the total fluxes: (1) organichorizons (O) and (2) organic and mineral soil horizons (O+M). Three drying–wetting treatmentswith different rewetting intensities (8, 20, and 50mm of irrigation d–1) have been compared to aconstantly moist control to estimate the influence of rainfall intensity under identical drying conditionsand constant temperature (+15°C). Drought significantly reduced CO2, N2O, and NO fluxesin most cycles. Following rewetting, CO2 fluxes quickly recovered back to control level in the Ocolumns but remained significantly reduced in the O+M columns with total CO2 fluxes from thedrying–wetting treatment ranging approx. 80% of control fluxes. Fluxes of N2O and NOremained significantly reduced in both O and O+M columns even after rewetting, with cumulativefluxes from drying–wetting treatments ranging between 20% and 90% of the control fluxes,depending on gas and cycle. Fluxes of CH4 were small in all treatments and seem to play no significantrole in this soil. No evidence for the release of additional gas fluxes due to drying–wettingwas found. The intensity of rewetting had no significant effect on the CO2, N2O, NO, and CH4fluxes, suggesting that the length of the drought period is more important for the emission ofthese gases. We can therefore not confirm earlier findings that fluxes of CO2, N2O, and NO duringwetting of dry soil exceed the fluxes of constantly moist soil.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER55051
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:33
Last Modified: 11 Sep 2015 06:33
URI: https://eref.uni-bayreuth.de/id/eprint/19104