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  Persistence of dissolved organic matter explained by molecular changes during its passage through soil

Roth, V.-N., Lange, M., Simon, C., Hertkorn, N., Bucher, S., Goodall, T., et al. (2019). Persistence of dissolved organic matter explained by molecular changes during its passage through soil. Nature Geoscience, 12, 755-761. doi:10.1038/s41561-019-0417-4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-63E8-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-9ED6-9
Genre: Journal Article

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 Creators:
Roth, Vanessa-Nina1, Author              
Lange, Markus1, Author              
Simon, Carsten1, 2, Author              
Hertkorn, Norbert, Author
Bucher, Sebastian3, Author              
Goodall, Timothy, Author
Griffiths, Robert I., Author
Mellado-Vázquez, Perla Griselle1, Author              
Mommer, Liesje, Author
Oram, Natalie J., Author
Weigelt, Alexandra, Author
Dittmar, Thorsten, Author
Gleixner, Gerd1, Author              
Affiliations:
1Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497775              
2IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              
3Molecular Biogeochemistry Group, Dr. G. Gleixner, Max Planck Institute for Biogeochemistry, ou_1497775              

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 Abstract: Dissolved organic matter affects fundamental biogeochemical processes in the soil such as nutrient cycling and organic matter storage. The current paradigm is that processing of dissolved organic matter converges to recalcitrant molecules (those that resist degradation) of low molecular mass and high molecular diversity through biotic and abiotic processes. Here we demonstrate that the molecular composition and properties of dissolved organic matter continuously change during soil passage and propose that this reflects a continual shifting of its sources. Using ultrahigh-resolution mass spectrometry and nuclear magnetic resonance spectroscopy, we studied the molecular changes of dissolved organic matter from the soil surface to 60 cm depth in 20 temperate grassland communities in soil type Eutric Fluvisol. Applying a semi-quantitative approach, we observed that plant-derived molecules were first broken down into molecules containing a large proportion of low-molecular-mass compounds. These low-molecular-mass compounds became less abundant during soil passage, whereas larger molecules, depleted in plant-related ligno-cellulosic structures, became more abundant. These findings indicate that the small plant-derived molecules were preferentially consumed by microorganisms and transformed into larger microbe-derived molecules. This suggests that dissolved organic matter is not intrinsically recalcitrant but instead persists in soil as a result of simultaneous consumption, transformation and formation.

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 Dates: 2019-082019-08-052019-09
 Publication Status: Published in print
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 Identifiers: Other: BGC3111
DOI: 10.1038/s41561-019-0417-4
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Title: Nature Geoscience
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 Sequence Number: - Start / End Page: 755 - 761 Identifier: ISSN: 1752-0894
CoNE: https://pure.mpg.de/cone/journals/resource/1752-0894