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Inorganic carbon leaching from a warmed and irrigated carbonate forest soil

Title data

Schindlbacher, Andreas ; Beck, Kerstin ; Holzheu, Stefan ; Borken, Werner:
Inorganic carbon leaching from a warmed and irrigated carbonate forest soil.
In: Frontiers in Forests and Global Change. Vol. 2 (2019) . - p. 40.
ISSN 2624-893X
DOI: https://doi.org/10.3389/ffgc.2019.00040

Abstract in another language

The response of dissolved inorganic carbon (DIC) leaching to rising temperature and precipitation is hardly known for forest soils on carbonate bedrock. We establishedfield lysimeters, filled with soil from a humus-rich A horizon of a Rendzic Leptosol and detrital dolomite (C horizon) and conducted a two-factorial climate manipulation [control (C), soil warming (H, +4°C), irrigation (I, +50% precipitation), soil warming and irrigation (H+I)] to examine the effects of increased temperature and precipitation on DIC and DOC leaching, soil air CO2 concentrations, and soil CO2 efflux. We followed an isotopic approach to assess the biotic and abiotic DIC fractions. Soil warming (H) had no effect on DIC leaching and seepage DIC concentrations. Irrigation (I and H+I) increasedannual DIC leaching by almost 100% as a matter of significantly increased seepage DICconcentrations and higher annual drainage. Isotopic partitioning of DIC fluxes suggested biotic contributions between 60 and 100% and no significant variation with warming or irrigation. Soil warming consistently increased the soil CO2 efflux by >50% independentlyof irrigation treatment. Soil air CO2 concentrations were not affected by soil warming alone (H). Irrigation (I and I+H) tended to increase subsoil (18 and 32cm depth) soil air CO2 concentrations, while topsoil (6 cm) remained unaffected by irrigation. DIC leaching losses were about 4–5 times higher than DOC leaching losses, which showed a similartreatment response (I and H+I > C and H). Annual DIC leaching amounted to between 20 ± 2 (C) and 39 ± 2 (H+I) g m−2, representing ∼ 2–5% of the total annual gaseoussoil CO2 loss. Our results suggest that climate change, especially changing precipitation, could significantly affect the DIC export from carbonate forest soils, thereby affecting their carbon sequestration potential.

Further data

Item Type: Article in a journal
Refereed: Yes
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
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 28 Jan 2020 08:38
Last Modified: 28 Jan 2020 08:38
URI: https://eref.uni-bayreuth.de/id/eprint/53892