Ophelie Sauzet

Ophelie Sauzet
University of Applied Sciences of Western Switzerland

PhD - Soil Science - Université Paris-Saclay
Tenure Track Assistant Professor at Soils and Substrates Group, University of Applied Sciences of Western Switzerland

About

27
Publications
6,695
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166
Citations
Introduction
Land use change or agricultural practices influence soil evolution such as the structuration and bioturbation processes. Our research is thus dealing with i) soil characterization especially through soil physical analysis and machine vision technologies, ii) organic matter status (content and quality) and, iii) soil monitoring by farmers. The associated approach and results are used to identify soil improving cropping practices adapted to the place of production and soil type.

Publications

Publications (27)
Article
Full-text available
Letter to the Editor of the European Journal of Soil Science as a reaction to the Russell Review by Phillipe Baveye “Bypass and hyperbole in soil research: worrisome practices critically reviewed through examples” and to his follow‐up Invited Opinion paper “Bypass and hyperbole in soil research: a personal view on plausible causes and possible reme...
Article
Full-text available
Earthworms are known to play an important role in soil processes, especially in the regeneration of soil structure. However, quantitative studies about their role on soil physical properties are still scarce. In this study the effects of two earthworm species (Nicodrilus nocturnus as anecic, Allolobophora icterica as endogeic) following three treat...
Article
Following the rapid development of models to assess and map ecosystem services (ES) in the last decades, there is an increasing need for comparative studies testing their efficiency and accuracy against field data. The representation of soils in these models is often oversimplified and remains a major source of uncertainty in ES assessment and mapp...
Article
Full-text available
As a result of the limited knowledge on eluviation/illuviation and bioturbation rates, these two processes of soil particles translocation are qualitatively described either as synergic or competing processes. Here we take the opportunity of the recent development of an image analysis procedure to quantify illuvial clay and earthworm’s porosity to...
Article
Full-text available
The soil organic carbon to clay ratio (SOC:clay) is a metric used in soil quality management. In Switzerland and the United Kingdom, for example, threshold values for SOC:clay ratios have been determined to indicate very good (>1:8) to degraded (<1:13) soil structures. A recent article in Soil Use and Management by Poeplau and Don, however, suggest...
Article
Over the last decade, the ecosystem services (ESs) framework has been increasingly used to support mapping and assessment studies for sustainable land management purposes. Previous analysis of practical applications has revealed the significance of the spatial scale at which input data are obtained. This issue is particularly problematic with soil...
Chapter
This chapter examines advances in machine vision technologies for the measurement of soil texture, structure and topography. It starts by providing an overview of the basic principles of machine vision technologies, focusing on areas such as 3D surface modelling and various methods of soil thin section microscopy. Two case studies are also provided...
Article
Full-text available
Soil organic carbon (SOC) fashions soil structure which is a key factor of soil fertility. Existing SOC content recommendations are based on a SOC:clay ratio thresholds of > 1:10. However, the corresponding SOC content might be considered hard to reach in clayey soils, whose structure degradation risk is assumed to be high. Here, we analysed the SO...
Conference Paper
Full-text available
Soil structure degradation is considered a major threat to soil fertility in many regions, including the Swiss Jura. In order to investigate the extent of this degradation and the means to improve soil structure quality (SSQ) with different farming practices, a large scale project "Terres Vivantes" was launched in 2019 by the canton of Jura and Ber...
Article
Full-text available
Increasing cropland topsoil organic carbon (SOC) content is a key goal for soil improving quality and adaptating soils to climate change. Moreover, the short term potential of climate mitigation by carbon sequestration is mostly attributed to increasing topsoil SOC content (Balesdent and Arrouays, 1999, Chambers et al., 2016; Minasny et al., 2017;...
Poster
Full-text available
The understanding and characterization of the relationship between soil formation processes and pedogenetic factors is a key question of pedogenesis issue.
Article
Full-text available
Increasing soil organic carbon (SOC) content is crucial for soil quality and climate change mitigation. SOC monitoring is indispensable to the corresponding policies and should provide results at farm scale to allow for incentives. In Switzerland, farmers perform mandatory analyses of the SOC content of the 0–20 cm topsoil of every field, based on...
Conference Paper
Full-text available
Since 1993, analysing the soil of any cropped field at least every ten years is required to receive subsides associated with ecological services in Switzerland. After data quality control, we used 3'000 repeated analyses available from the cantons of Vaud and Geneva to quantify the deficit in Soil Organic Carbon (SOC), the SOC content change rate p...
Conference Paper
Full-text available
Increasing soil organic carbon (SOC) content is crucial for soil quality restauration and climate change mitigation. SOC monitoring is indispensable to the corresponding policies and should provide results at farm scale to allow for incentives. In Switzerland farmers perform mandatory analyses of the SOC content of the 0-20 cm topsoil of every fiel...
Conference Paper
Earthworms are known to play a key role on soil ecological processes such as organic matter turnover, nutrient cycling and soil physical properties engineering and soil fertility as a whole. However, their role on numerous soil physical properties is still poorly documented. The objectives of the present study were to test the effect of two earthwo...
Article
Mercury (Hg) is a contaminant of global importance but its fate and impact in soils is overlooked. Earthworms are responsible for soil bioturbation but their interaction with Hg is poorly described. This study was conducted on a Hg contaminated site in Switzerland. The objectives were to determine the Hg tolerance of Lumbricus terrestris and Aporre...
Article
Full-text available
Le lessivage correspond au transfert vertical descendant de particules d’un diamètre inférieur à 2 μm. Ce faisant, il induit peu à peu une perte de fertilités chimique et physique des horizons de surface des sols. La bioturbation par les vers de terre, notamment anéciques, est, à l’inverse, à l’origine d’un transfert vertical ascendant susceptible...
Thesis
Full-text available
La capacité du sol à fournir de nombreux services écosystémiques dépend de propriétés qui évoluent en permanence sous l’effet de multiples processus. Or, malgré leur importance, les dynamiques des processus de lessivage et de bioturbation de la fraction < 2 μm sont peu connues. Nous nous sommes alors fixés pour objectifs de i) développer et valider...
Article
Full-text available
Studies of degraded semiarid regions have shown that organic residue addition is a sound restoration alternative. We examined the effects of a single dose (40 Mg ha(-1)) of biosolids compost (BC) and compost of the organic fraction of municipal solid waste (MC) 6 years after they were applied to a sandy soil of NW Patagonia. Results were compared w...

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