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Conference Papers Year : 2023

Quantitative importance of various rhizodeposition processes: lessons from a mechanistic functional-structural root model

Abstract

Rhizodeposits, defined here as any organic materials released by living roots, can represent up to 15% of net amount of carbon (C) photosynthesized by a plant (Pausch and Kuzyakov, 2018). Rhizodeposits have been shown to play an important role in plant growth through various mechanisms (e.g. by favoring water uptake through mucilage secretion, or nutrient uptake through the exudation of soluble compounds), and to represent a major contributor to the formation of stable soil organic matter - and thus to the mitigation of climate change through soil C sequestration. Decomposing rhizodeposition into its elementary processes (e.g. exudation, mucilage secretion, cells sloughing) is required for a better understanding of the response of rhizodeposition to various environmental constraints and of its associated- benefits. While many works have attempted to quantify the exudation of soluble organic compounds at the scale of a plant or the net rhizodeposition of C in soils, very few studies have been able to estimate the amount of mucilage or sloughed cells released by a whole root system over time. Consequently, while it has been claimed that the amount of soluble organic C is much higher than the amount of C released as mucilage or sloughed cells by roots (Nguyen, 2003; Rees et al. 2005), the relative importance of distinct rhizodeposition processes in plant’s and soil’s C balance remains largely unknown. While the comparison of mucilage secretion and citrate exudation within a FSPM has been recently attempted (Landl et al. 2021), no model has been developed so far for simulating such rhizodeposition processes as part of plant’s C management. The present work aimed to give a better assessment of the contribution of distinct rhizodeposition processes to the total amount of organic C released by roots, for different plant species, growth stages and environments
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Dates and versions

hal-04098521 , version 1 (16-05-2023)

Identifiers

  • HAL Id : hal-04098521 , version 1

Cite

Frédéric Rees, Marion Gauthier, Romain Barillot, Céline Richard-Molard, Alexandra Jullien, et al.. Quantitative importance of various rhizodeposition processes: lessons from a mechanistic functional-structural root model. FSPM 2023 - 10th International Conference on Functional-Structural Plant Models, Mar 2023, Berlin, Germany. ⟨hal-04098521⟩
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