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Communication Dans Un Congrès Année : 2019

Mobilization of Mineral-Protected Organic C at the Root-Soil Interface: Effects of Variation in Rhizodeposition

Résumé

Protective mineral-organic associations are the quantitatively most important soil carbon (C) storage mechanism, but we know very little about their response to active root growth. While it is well established that root-derived compounds (rhizodeposits) can promote (or “prime”) the microbial decomposition of organic matter, our mechanistic knowledge of the ability of rhizodeposits to destabilize mineral-associated organic matter remains limited. Here we tested the ability of various low-molecular weight compounds commonly observed in the rhizosphere (sugars, ligands, reductants) to cause the mobilization and mineralization of organic matter associated with different mineral types (Fe and Al hydroxides). We hypothesized that mobilization of organic matter from minerals varies among rhizodeposits as well as mineral phases. Our results show that larger amounts of C were mobilized from Fe hydroxide than Al hydroxide. Further, sugars and reductants revealed a greater mobilization potential than ligands. In addition, we investigated the mobilization of mineral-protected C in soils planted with Avena sativa over a course of four weeks. We used viral infected (Barley Yellow Dwarf Virus) and noninfected plants, because viral infection potentially alters the intensity and composition of rhizodeposition. Results indicate that variation in rhizodeposition affects the mobilization and mineralization of previously mineral-associated organic C. Overall, our work intends to improve mechanistic understandings of links between rhizodeposition of organic compounds and mobilization of mineral associated organic C.
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Dates et versions

hal-04490235 , version 1 (05-03-2024)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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  • HAL Id : hal-04490235 , version 1

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Tobias Bölscher, Hui Li, Zoe G Cardon, Carolyn Malmstrom, Matthew Winnick, et al.. Mobilization of Mineral-Protected Organic C at the Root-Soil Interface: Effects of Variation in Rhizodeposition. AGU fall meeting 2019, American Geosciences Union, Dec 2019, San Francicco, United States. ⟨hal-04490235⟩
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