Titel
13C-Labeled Artificial Root Exudates Are Immediately Respired in a Peat Mesocosm Study
Autor*in
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Abstract
Globally, peatlands have been recognized as important carbon sinks while only covering approximately 3% of the earth’s land surface. Root exudates are known key drivers of C cycling in soils and rhizosphere priming effects have been studied extensively in terrestrial ecosystems. Their role for decomposition of peat still remains unclear, as little research about their fate and potential priming effects in peat exists. In this study, we aimed to evaluate pathways of root exudates and their short-term priming effects by daily determination of stable carbon isotope fluxes of CO2 and CH4. As the drainage of peatlands strongly alters processes of decomposition, we included measurements after drainage as well. Results revealed the immediate respiration of root exudates in peat, mainly as CO2, while CH4 release was associated with a lag time of several days. However, the largest proportion of added root exudates remained in the solid and liquid phase of peat. In conclusion, our findings suggest that no priming occurred as added substrates remained immobile in peat.
Stichwort
root exudatespriming effectpeatCO2CH4stable carbon isotopesclimate changedecomposition
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
Diversity
Band
14
Ausgabe
9
ISSN
1424-2818
Erscheinungsdatum
2022
Publication
MDPI AG
Erscheinungsdatum
2022
Zugänglichkeit
Rechte
Rechteangabe
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