Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Vogel, Laure; Makowski, David; Garnier, Patricia; Vieublé-Gonod, Laure; Coquet, Yves; Raynaud, Xavier; Nunan, Naoise; Chenu, Claire; Falconer, Ruth E.; Pot, Valérie

doi:10.1016/j.advwatres.2015.05.020

Cited by 52 publications

(47 citation statements)

References 74 publications

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“…Our study clearly demonstrates that complex interactions between soil microbial communities; different soil organic fractions and management practices that occur at the scale of soil aggregates could regulate “release” or “retention” of soil C. This is a key finding in relation to the emerging paradigm in SOC dynamics that suggest that different soil C pools may have different underlying drivers and potentially leading to different relationships with management outcomes (Schmidt et al ., ; Wood et al ., ). Our study highlight the need of modelling the differential effects of soil aggregate level processes for representing soil C dynamics that otherwise are lost in continuum or mean field models that ignore dynamic interactions of microbial communities subjected to abiotic constrains modulated by soil aggregate size (Manzoni and Porporato, ; Vogel et al ., ; Ebrahimi and Or, ).…”

Section: Discussionmentioning

confidence: 98%

Soil aggregation and associated microbial communities modify the impact of agricultural management on carbon content

Trivedi

Delgado‐Baquerizo

Jeffries

et al. 2017

Environmental Microbiology

212

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Soil carbon (C) stabilisation is known to depend in part on its distribution in structural aggregates, and upon soil microbial activity within the aggregates. However, the mechanisms and relative contributions of different microbial groups to C turnover in different aggregates under various management practices remain unclear. The aim of this study was to determine the role of soil aggregation and their associated microbial communities in driving the responses of soil organic matter (SOM) to multiple management practices. Our results demonstrate that higher amounts of C inputs coupled with greater soil aggregation in residue retention management practices has positive effects on soil C content. Our results provide evidence that different aggregate size classes support distinct microbial habitats which supports the colonisation of different microbial communities. Most importantly our results indicate that the effects of management practices on soil C is modulated by soil aggregate sizes and their associated microbial community and are more pronounced in macro-aggregate compared with micro-aggregate sizes. Based on our findings we recommend that differential response of management practices and microbial control on the C turnover in macro-aggregates and micro-aggregate should be explicitly considered when accounting for management impacts on soil C turnover.

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Section: Discussionmentioning

confidence: 98%

Soil aggregation and associated microbial communities modify the impact of agricultural management on carbon content

Trivedi

Delgado‐Baquerizo

Jeffries

et al. 2017

Environmental Microbiology

212

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“…The observed non-linear control of substrate concentration on C loss dynamics and microbial decomposition strategies could also be related to the spatial distribution of microbes and their substrate and the average distance between them (Don et al 2013;Falconer et al 2015;Ruamps et al 2013;Schimel and Schaeffer 2012;Vogel et al 2015). Microbes and particulate organic carbon (POC) occupy a defined soil space.…”

Section: Concepts Behind the Effect Of C Concentration On Decompositionmentioning

confidence: 99%

Substrate quality and concentration control decomposition and microbial strategies in a model soil system

et al. 2019

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Soil carbon models typically scale decomposition linearly with soil carbon (C) concentration, but this linear relationship has not been experimentally verified. Here we investigated the underlying biogeochemical mechanisms controlling the relationships between soil C concentration and decomposition rates. We incubated a soil/sand mixture with increasing amounts of finely ground plant residue in the laboratory at constant temperature and moisture for 63 days.

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“…These models include an explicit 2D or 3D description of the pore network based on computer tomography images (Monga et al 2008(Monga et al , 2014Falconer et al 2007Falconer et al , 2015Pajor et al 2010;Resat et al 2012;Vogel et al 2015). They operate over short time scales and have been validated for simplified systems.…”

Section: Modelling Om Mineralisation At the Micro-scale Could Help Dementioning

confidence: 99%

Increasing soil carbon storage: mechanisms, effects of agricultural practices and proxies. A review

Dignac

Derrien

Barré

et al. 2017

Agron. Sustain. Dev.

Self Cite

375

170

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The international 4 per 1000 initiative aims at supporting states and non-governmental stakeholders in their efforts towards a better management of soil carbon (C) stocks. These stocks depend on soil C inputs and outputs. They are the result of fine spatial scale interconnected mechanisms, which stabilise/destabilise organic matter-borne C. Since 2016, the CarboSMS consortium federates French researchers working on these mechanisms and their effects on C stocks in a local and global change setting (land use, agricultural practices, climatic and soil conditions, etc.). This article is a synthesis of this consortium's first seminar. In the first part, we present recent advances in the understanding of soil C stabilisation mechanisms comprising biotic and abiotic processes, which occur concomitantly and interact. Soil organic C stocks are altered by biotic activities of plants (the main source of C through litter and root systems), microorganisms (fungi and bacteria) and 'ecosystem engineers' (earthworms, termites, ants). In the meantime, abiotic processes related to the soil-physical structure, porosity and mineral fraction also modify these stocks. In the second part, we show how agricultural practices affect soil C stocks. By acting on both biotic and abiotic mechanisms, land use and management practices This synthesis of the CarboSMS French consortium's first seminar was already published in French: Derrien D, Dignac M-F, Basile-Doelsch I, Barot S, Cécillon L, Chenu C, Chevallier T, Freschet GT, Garnier P, Guenet B, Hedde M, Klumpp K, Lashermes G, Maron P-A, Nunan N, Roumet C, Barré P (2016) (choice of plant species and density, plant residue exports, amendments, fertilisation, tillage, etc.) drive soil spatiotemporal organic inputs and organic matter sensitivity to mineralisation. Interaction between the different mechanisms and their effects on C stocks are revealed by meta-analyses and long-term field studies. The third part addresses upscaling issues. This is a cause for major concern since soil organic C stabilisation mechanisms are most often studied at fine spatial scales (mm-μm) under controlled conditions, while agricultural practices are implemented at the plot scale. We discuss some proxies and models describing specific mechanisms and their action in different soil and climatic contexts and show how they should be taken into account in large scale models, to improve change predictions in soil C stocks. Finally, this literature review highlights some future research prospects geared towards preserving or even increasing C stocks, our focus being put on the mechanisms, the effects of agricultural practices on them and C stock prediction models.

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Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Cited by 52 publications

References 74 publications

Soil aggregation and associated microbial communities modify the impact of agricultural management on carbon content

Soil aggregation and associated microbial communities modify the impact of agricultural management on carbon content

Substrate quality and concentration control decomposition and microbial strategies in a model soil system

Increasing soil carbon storage: mechanisms, effects of agricultural practices and proxies. A review

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