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Contribution of carbonate weathering to the CO2 efflux from temperate forest soils

Title data

Schindlbacher, Andreas ; Borken, Werner ; Djukic, Ika ; Brandstätter, Christian ; Spötl, Christoph ; Wanek, Wolfgang:
Contribution of carbonate weathering to the CO2 efflux from temperate forest soils.
In: Biogeochemistry. Vol. 124 (2015) Issue 1 . - pp. 273-290.
ISSN 1573-515X
DOI: https://doi.org/10.1007/s10533-015-0097-0

Abstract in another language

Temperate forests provide favorable conditions for carbonate bedrock weathering as the soilCO2 partial pressure is high and soil water is regularly available. As a result of weathering, abiotic CO2 can be released and contribute to the soil CO2 efflux. We used the distinct isotopic signature of the abiotic CO2 to estimate its contribution to the total soil CO2 efflux.Soil cores were sampled from forests on dolomite andlimestone and were incubated under the exclusion of atmospheric CO2. Efflux and isotopic signatures ofCO2 were repeatedly measured of cores containing the whole mineral soil and bedrock material (heterotrophic respiration? CO2 from weathering) and of corescontaining only the mineral top-soil layer (A-horizon;heterotrophic respiration). An aliquot of the cores were let dry out during incubation to assess effects of soil moisture. Although the d13C values of the CO2 efflux from the dolomite soil cores were within a narrow range (A-horizon -26.2 ± 0.1 %; whole soil profile wet -25.8 ± 0.1 %; whole soil profile dry -25.5 ± 0.1 %) the CO2 efflux from the separatedA-horizons was significantly depleted in 13C when compared to the whole soil profiles (p = 0.015). The abiotic contribution to the total CO2 efflux from thedolomite soil cores was 2.0 ± 0.5 % under wet and 3.4 ± 0.5 % under dry conditions. No abiotic CO2efflux was traceable from the limestone soil cores. An overall low contribution of CO2 from weathering was affirmed by the amount and 13C signature of theleached dissolved inorganic carbon (DIC) and the radiocarbon signature of the soil CO2 efflux in the field. Together, our data point towards no more than 1–2 % contribution of abiotic CO2 to the growing season soil CO2 efflux in the field.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER124487
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Aug 2016 10:19
Last Modified: 03 Aug 2016 10:19
URI: https://eref.uni-bayreuth.de/id/eprint/33804