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Reduced CO₂ Release from Arctic Soils Due to CO₂ Binding to Calcium Forming Aragonite

Title data

Stimmler, Peter ; Obst, Martin ; Lehmann, Johannes ; Stein, Mathias ; Hockmann, Kerstin ; Göckede, Mathias ; Schaller, Jörg:
Reduced CO₂ Release from Arctic Soils Due to CO₂ Binding to Calcium Forming Aragonite.
In: Environmental Science & Technology. Vol. 58 (2024) Issue 40 . - pp. 17695-17702.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.4c07496

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Arctic soils are the largest pool of organic carbon compared with other soils globally and serve as a main source for greenhouse gases, especially in the course of the predicted future temperature increase. With increasing temperatures, substantial thawing of the permafrost layer of soils is expected, altering the availability of calcium in those soils, with an increase by ∼5 mg Ca g–1 DW predicted for Alaska. Here we show for two representative soils in Alaska (initially Ca-poor or Ca-rich) that this increase in Ca availability will lead to decreases in CO2 release by 50% and 57%. It is already well-known that the cation bridging of Ca ions to organic carbon renders this carbon unavailable for microbial respiration and that Ca is altering the transformation of Corg by microbes. Here we show that the decrease of the soil CO2 release may be also due to enhanced aragonite formation (by 300% for Ca-poor and 90–200% for Ca-rich soils), as revealed by synchrotron-based scanning transmission X-ray microscopy. We therefore call upon field experiments for validation of this process and inclusion of this process in global and local carbon budget models.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Arctic Carbon Storage; Permafrost Soils; Soil Respiration; Soil Carbon Binding; TXM-NEXAFS
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg Professorship - Experimental Biogeochemistry > Heisenberg Professorship - Experimental Biogeochemistry - Univ.-Prof. Dr. Martin Obst
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 22 Oct 2024 06:01
Last Modified: 22 Oct 2024 06:01
URI: https://eref.uni-bayreuth.de/id/eprint/90778