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Conference papers

A possible trade-off between soil nitrogen availability and root carbon inputs to soil

Abstract : The potential of agricultural soils to store carbon (C) has been claimed to require a large amount of nitrogen (N) and therefore a high soil N availability. This assumption is based on the observation that stable soil organic compounds are characterized by a narrow range in C:N ratios. However, N-fertilizer additions have also been shown to increase respiratory C losses from soils. Furthermore, most of the organic C naturally stored in soils originate from plant C inputs, which occur both by aerial litter deposition and by root turnover and rhizodeposition. Root C inputs have been shown to contribute 2-3 times more to soil C sequestration than shoot-derived C inputs. However, root C inputs may be limited or even decrease when soil N availability increases beyond a certain level. A trade-off may therefore exist between the amount of soil available N and the potential of soil C sequestration associated to the inputs of root C. The existence of such trade-off and its possible consequences for the optimization of soil C sequestration will be discussed according to evidences from scientific literature and to a modelling approach describing how root C inputs to soil can evolve with soil N availability.
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Conference papers
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Contributor : Migration Prodinra <>
Submitted on : Thursday, September 24, 2020 - 9:14:54 AM
Last modification on : Thursday, May 6, 2021 - 10:45:59 AM


  • HAL Id : hal-02947441, version 1
  • PRODINRA : 487027


Frédéric Rees, Claire Chenu, Bruno Andrieu. A possible trade-off between soil nitrogen availability and root carbon inputs to soil. International conference "Food security and climate change: 4 per 1000 initiative new tangible global challenges for the soil", Jun 2019, Poitiers, France. ⟨hal-02947441⟩



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