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Vertical partitioning of CO 2 production in a forest soil
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Abstract
Large amounts of total organic carbon are temporarily stored in soils, which makes soil respiration one of the major sources of terrestrial CO 2 fluxes within the global carbon cycle. More than half of global soil organic carbon (SOC) is stored in subsoils (below 30 cm), which represent a significant carbon (C) pool. Although several studies and models have investigated soil respiration, little is known about the quantitative contribution of subsoils to total soil respiration or about the sources of CO 2 production in subsoils. In a 2-year field study in a European beech forest in northern Germany, vertical CO 2 concentration profiles were continuously measured at three locations, and CO 2 production was quantified in the topsoil and the subsoil. To determine the contribution of fresh litter-derived C to CO 2 production in the three soil profiles, an isotopic labelling experiment, using 13 C-enriched leaf litter, was performed. Additionally, radiocarbon measurements of CO 2 in the soil atmosphere were used to obtain information about the age of the C source in the CO 2 production. At the study site, it was found that 90 % of total soil respiration was produced in the first 30 cm of the soil profile, where 53 % of the SOC stock is stored. Freshly labelled litter inputs in the form of dissolved organic matter were only a minor source for CO 2 production below a depth of 10 cm. In the first 2 months after litter application, fresh litter-derived C contributed, on average, 1 % at 10 cm depth and 0.1 % at 150 cm depth to CO 2 in the soil profile. Thereafter, its contribution was less than 0.3 % and 0.05 % at 10 and 150 cm depths, respectively. Furthermore CO 2 in the soil profile had the same modern radiocarbon signature at all depths, indicating that CO 2 in the subsoil originated from young C sources despite a radiocarbon age bulk SOC in the subsoil. This suggests that fresh C inputs in subsoils, in the form of roots and root exudates, are rapidly respired, and that other subsoil SOC seems to be relatively stable. The field labelling experiment also revealed a downward diffusion of 13 CO 2 in the soil profile against the total CO 2 gradient. This isotopic dependency should be taken into account when using labelled 13 C and 14 C isotope data as an age proxy for CO 2 sources in the soil.
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For subsoils with comparable climatic conditions, temperatures at 150 cm depth ranged from 4 to 14.4°C over a 2-year period.
“For subsoils with comparable climatic conditions, Wordell-Dietrich et al. (2020) found temperatures at 150 cm depth ranging from 4 to 14.4 C over a 2-year period.”
From Geogenic organic carbon in terrestrial sediments and its contribution to total soil carbon (2021) · cites this paper as Wordell-Dietrich et al., 2020
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Metadata
- Authors
- Wordell-Dietrich, P., Wotte, A., Rethemeyer, J., Bachmann, J., Helfrich, M., Kirfel, K., Leuschner, C., & Don, A.
- Affiliations
- University of Cologne (DE)
- Leibniz University Hannover (DE)
- Johann Heinrich von Thünen-Institut (DE)
- University of Göttingen (DE)
- Corresponding author
- Wotte, Anja
- Don, Axel
- ORCID
- Venue
- Biogeosciences
- Publisher
- Copernicus GmbH
- Published
- 2020-12-15
- Volume
- 17
- Issue
- 24
- Pages
- 6341-6356
- ISSN
- 1726-4170 (ISSN-L)
- 1726-4189
- OpenAlex
- W3113136507
- Cited by
- 28
- References
- 54
- Citations by year
- 2026: 4 · 2025: 8 · 2024: 5 · 2023: 3 · 2022: 4 · 2021: 2 · 2020: 2
- FWCI
- 1.82
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Biogeosciences (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- GoeScholar The Publication Server of the Georg-August-Universität Göttingen (Georg-August-Universität Göttingen) (submittedVersion)
- Funders
- Deutsche Forschungsgemeinschaft (HE 6877/1-1)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Engineering › Civil and Structural Engineering › Soil and Unsaturated Flow
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
- Keywords
- soil respiration, subsoil, soil organic carbon, vertical CO2 profiles, dissolved organic matter, radiocarbon ages, root exudates, European beech forests, soil carbon storage, soil carbon stability, terrestrial carbon cycle, carbon-14
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