Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 552831
Title Persistence of dissolved organic matter explained by molecular changes during its passage through soil
Author(s) Roth, Vanessa Nina; Lange, Markus; Simon, Carsten; Hertkorn, Norbert; Bucher, Sebastian; Goodall, Timothy; Griffiths, Robert I.; Mellado-Vázquez, Perla G.; Mommer, Liesje; Oram, Natalie J.; Weigelt, Alexandra; Dittmar, Thorsten; Gleixner, Gerd
Source Nature Geoscience 12 (2019). - ISSN 1752-0894 - p. 755 - 761.
DOI https://doi.org/10.1038/s41561-019-0417-4
Department(s) PE&RC
Plant Ecology and Nature Conservation
Soil Biology
Publication type Refereed Article in a scientific journal
Publication year 2019
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 microbial-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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