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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.
Bd. 124
(2015)
.
- S. 273-290.
ISSN 1573-515X
DOI: https://doi.org/10.1007/s10533-015-0097-0
Abstract
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.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER124487 |
| Institutionen der Universität: | Forschungseinrichtungen Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 03 Aug 2016 10:19 |
| Letzte Änderung: | 30 Okt 2024 13:17 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/33804 |