Incorporation of hydrogen from ambient water into the C-bonded H pool during litter decomposition

Aridity was observed to affect the C-bonded stable H isotope ratios (δ2Hn values) of aboveground plant organic matter but not δ2Hn values of associated soil organic matter (SOM). Instead, δ2Hn values of SOM correlated spatially with long-term mean δ2H values of local rainfall. To explain this discre...

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Bibliographic Details
Published in:Soil biology & biochemistry 2021-11, Vol.162, p.108407, Article 108407
Main Authors: Kessler, Arnim, Kreis, Katharina, Merseburger, Stefan, Wilcke, Wolfgang, Oelmann, Yvonne
Format: Article
Language:English
Subjects:
2H-enriched water
C-bonded H
Isotope labeling
Leaf litter incubation
Soil organic matter
Stable isotope ratios of H
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Summary:Aridity was observed to affect the C-bonded stable H isotope ratios (δ2Hn values) of aboveground plant organic matter but not δ2Hn values of associated soil organic matter (SOM). Instead, δ2Hn values of SOM correlated spatially with long-term mean δ2H values of local rainfall. To explain this discrepancy, we investigated if and to which degree C-bonded H was replaced by ambient water-H during leaf litter decomposition in laboratory microcosms. In a four-week incubation of leaf litter (Fagus sylvatical. - beech,Acer pseudoplatanusl. - maple) with two H-isotopically labeled waters (δ2Hiw: +50‰, +250‰), we found a small incorporation of isotopically labeled H into the C-bonded H pool (
ISSN:0038-0717
1879-3428
DOI:10.1016/j.soilbio.2021.108407