Isabelle Bertrand

Isabelle Bertrand
French National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Department of Environment and Agronomy

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About

115
Publications
35,462
Reads
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2,396
Citations
Introduction
Isabelle Bertrand currently works at the Department of Environment and Agronomy, French National Institute for Agricultural Research. Isabelle does research in Agronomy, Soil Science and Environmental Science. Their current project is 'Agroforestry under mediterranean climate: impact on soil properties and functions'.
Additional affiliations
July 2014 - present
French National Institute for Agriculture, Food, and Environment (INRAE)
Position
  • Researcher
January 2002 - July 2014
French National Institute for Agriculture, Food, and Environment (INRAE)
Position
  • Researcher

Publications

Publications (115)
Preprint
Purpose In alley-cropping systems, the root distributions and traits of the annual and perennial vegetation are poorly known, although they are recognized as factors fostering soil carbon (C) stocks through annual root C inputs and by impacts on microbial activity. This study aimed to evaluate the potential contribution of roots from the understory...
Article
In agroforestry systems, fine roots grow at several depths due to the mixture of trees and annual crops. The decomposition of fine roots contributes to soil organic carbon stocks and may impact soil fertility, particularly in poor soils, such as those encountered in sub-Sahelian regions. The aim of our study was to measure the decomposition rate of...
Article
1. Soil enzymes are central to ecosystem processes because they mediate numerous reactions that are essential in biogeochemical cycles. However, how soil enzyme activities will respond to global warming is uncertain. We reviewed the literature on mechanisms linking temperature effects on soil enzymes and microbial communities, and outlined a concep...
Article
In alley cropping systems, herbaceous strips planted with trees are added into cropped fields. These systems could provide a favorable habitat for many organisms, producing shade in summer and litter in autumn, but their impacts on soil macrofauna are poorly studied, with most samplings limited to one date and therefore one season only. This study...
Article
Full-text available
Biochar application is attracting attention to be an effective soil organic carbon (SOC) management to prevent land degradation, though quantitative information of its effect on carbon dioxide (CO2) flux and associated microbial responses is still scarce, especially in degraded tropical agroecosystems. We conducted a 27‐month field experiment with...
Article
Full-text available
The evaluation of soil quality requires the use of robust methods to assess biologically based indicators. Among them, enzyme activities are used for several decades, but there is a clear need to update their measurement methods for routine use, in combining feasibility, accuracy, and reliability. To this end, the platform Biochem-Env optimized a m...
Article
Full-text available
Understanding phosphorus (P) dynamics in the rhizosphere is crucial for sustainable crop production. P mobilization processes in the rhizosphere include the release of plant and microbially-derived protons and extracellular phosphatases. We investigated the effect of root hairs and soil texture on the spatial distribution and intensity of P mobiliz...
Preprint
Biochar application is currently considered to be an effective soil organic carbon (SOC) management to prevent land degradation by enhancing SOC stock. However, quantitative information on the impact of biochar application on carbon dioxide (CO2) flux and associated microbial responses is still scarce, especially in degraded tropical agroecosystems...
Article
Alley cropping agroforestry systems are complex agroecosystems highlighted for their positive effects on soil quality. However, the potential spatial heterogeneity of soil quality created by tree rows at the plot scale has seldom been studied. The aim of this study was to evaluate soil quality at the plot scale, under tree rows and along transects...
Article
Plant diversification through crop rotation or agroforestry is a promising way to improve sustainability of agroecosystems. Nonetheless, criteria to select the most suitable plant communities for agroecosystems diversification facing contrasting environmental constraints need to be refined. Here, we compared the impacts of 24 different plant commun...
Article
Full-text available
PurposeAlley cropping systems introduce herbaceous strips planted with trees into cropped fields. While such systems may have a positive effect on soil fertility, the respective roles of the trees and the herbaceous vegetation in shaping this effect remain unclear. We investigated the effect of the distance from herbaceous strips with or without wa...
Preprint
Full-text available
The evaluation of soil quality requires the use of robust methods to assess biologically based-indicators. Among them, enzyme activities are used for several decades, but there is a clear need to update their measurement methods for routine use, in combining feasibility, accuracy and reliability. To this end, the platform Biochem-Env optimised a mi...
Article
Full-text available
The soil is a complex, heterogeneous and dynamic environment, it is there that various and essential biogeochemical processes take place for the functionning of plants and their ecosystems. The study of soil-roots interactions in the different soil horizons is crucial to understand the dynamics of nutriments and carbon as well as the role played by...
Article
Full-text available
Background & Aims Better understanding of belowground interactions in agroforestry systems is crucial for the success of plant co-existence. Beyond root competition, associated arbuscular mycorrhizal (AM) fungi can also be involved in plant to plant interactions. Thus far, the contribution of each agroforestry component (trees, herbaceous vegetatio...
Article
The priming effect describes the change in the rate of soil organic matter (SOM) mineralisation due to the addition of fresh organic matter (FOM), and is thus central to the evaluation of carbon fluxes in terrestrial ecosystems. However, little is known about how litter quality interact with soil properties and microbial communities to explain the...
Article
A new coated slow-release triple superphosphate (TSP) fertilizer was developed using formulations based on lignin (L) derived from olive pomace (OP) and κ-carrageenan (C) biopolymer, and different plasticizers were added: glycerol (G) and polyethylene glycol 200 (P200) and 2000 (P2000). The effect of the type and molecular weight of the plasticizer...
Article
Full-text available
The functioning and productivity of pre-Columbian raised fields (RFs) and their role in the development of complex societies in Amazonian savannas remain debated. RF agriculture is conducted today in the Congo Basin, offering an instructive analogue to pre-Columbian RFs in Amazonia. Our study of construction of present-day RFs documents periodic ad...
Article
Alley cropping systems present tree rows alternating with crop alleys. Tree rows are unculti-vated and often present an understory vegetation strip (UVS), whose impacts have been less studied than those of the trees. Spatial variations within UVSs and between UVSs and crop alleys were investigated for vegetation biomass and necromass, soil organic...
Article
Full-text available
Le sol est un environnement complexe, hétérogène et dynamique, lieu de multiples processus biogéochimiques essentiels au fonctionnement des plantes et des écosystèmes. L'étude des interactions sol-racine dans les différents horizons du sol est cruciale pour appréhender la dynamique des nutriments et du carbone, ainsi que le rôle joué par les microo...
Article
Full-text available
To date, the stoichiometry concept has been poorly used to explore C, N, and P cycles in agroecosystems. As agriculture is now under pressure to reduce the use of synthetic inputs, ecological processes and alternative agricultural practices will become the main regulators of the relationships between C, N, and P and thereby of nutrient availability...
Article
Biomass production and immobilization of carbon and nitrogen on marginal soils: a case of very short rotation coppices established without fertilization Description of the subject. This article presents the aboveground and belowground biomass balances of young non-fertilized short-rotation coppices, planted on marginal soils. Objectives. On two c...
Poster
Full-text available
Soil stoichiometry constraints may limit the impacts of agroecological practices to increase nutrient recycling and foster C storage in cropped soils. However, little is known about the long term impact of agricultural practices on soil stoichiometry. Our aim is to analyse long-term (8-49 yr) field experiments in France including several treatments...
Article
Notre contexte économique, environnemental et sociétal actuel nous incite à considérer, dans le cadre de la transition agroécologique, des pratiques agricoles limitant l'usage d'intrants de synthèse et favorisant la biodiversité planifiée dans les agroécosystèmes. Ces pratiques mobilisent certains services écosystémiques réalisés par la biocénose d...
Article
The relationship between litter quality and life strategy of soil microorganisms (copiotrophy vs oligotrophy) is important for understanding soil processes such as decomposition. Yet, whether and how this relationship may vary with the addition of substrates of contrasting quality (i.e., labile vs recalcitrant) has rarely been evaluated for both ba...
Article
Soil microbial communities in Mediterranean agroecosystems experience long drought periods that are typically combined with heat and frequently interspersed with rapid rewetting events. Agroforestry systems are of growing interest and viewed as possible alternative to conventional cropping systems in the context of climate change. Our aim was to ev...
Conference Paper
Full-text available
Les chercheurs de l'Initiative "4 pour 1000" réunis à Sète les 7 et 8 novembre 2018 lors de l’atelier "La recherche française autour du programme international de recherche de l’initiative 4 pour 1000 : les sols pour la sécurité alimentaire et le climat" ont lancé un appel pour un "programme scientifique ambitieux" pour la mise en œuvre du volet re...
Chapter
Full-text available
Biogeochemical cycles of carbon (C), nitrogen (N), phosphorus (P) are naturally coupled in terrestrial ecosystems by elemental stoichiometry of plant autotrophy and of soil biological heterotrophy. The shift from natural to cropped intensive systems lead to major changes in crops land-use, nutrient availability, soil management. This chapter presen...
Chapter
Full-text available
Biogeochemical cycles of carbon (C), nitrogen (N), and phosphorus (P) are naturally coupled in terrestrial ecosystems by elemental stoichiometry of plant autotrophy and of soil biologic heterotrophy. The shift from natural to cropped intensive systems led to major changes in crop land use, nutrient availability, and soil management. This chapter pr...
Presentation
Full-text available
Carbon (C), nitrogen (N) and phosphorus (P) cycles are intimately linked in ecosystems through key processes such as primary production and litter decomposition. Ecological stoichiometry has become a common approach for exploring relationships between biogeochemical cycles and ecosystems functions in ecological science (Sterner and Elser, 2002). In...
Book
Litter decomposition is an important process involved in nutrient cycling and soil fertility in ecosystems. In alley-cropping agroforestry systems, contrasted litters from the intercropped annual and perennial plants are more or less mixed and decomposed depending on the distance from the tree lines. Our aim was to unravel the determinants of C, N...
Book
Soil microbial communities in Mediterranean agroecosystems have to deal with severe drought, followed by heavy rains. Agroforestry systems associating crops and trees may present higher resilience to climate change than conventional cropping systems. The aim of our study was thus to assess i) the impact of an agroforestry system on the resistance a...
Article
Full-text available
Background The dynamics of phosphorus (P) in the environment is important for regulating nutrient cycles in natural and managed ecosystems and an integral part in assessing biological resilience against environmental change. Organic P (Po) compounds play key roles in biological and ecosystems function in the terrestrial environment being critical t...
Article
Full-text available
The article “Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities”, written by Timothy S George et al., was originally published with incorrect affiliation information for one of the co-authors, E. Klumpp.
Presentation
Full-text available
La gestion de la nutrition phosphatée des cultures est une problématique importante en agriculture. Le phosphore (P) est un élément nutritif indispensable aux végétaux et non substituable. Le phosphore est souvent le nutriment le moins disponible dans le sol en raison de ses fortes interactions avec les constituants du sol et de la faible solubilit...
Chapter
Full-text available
Le couplage des cycles du carbone et de l’azote dans les sols est sous le contrôle des communautés microbiennes hétérotrophes, pour lesquelles les matières organiques entrantes (litières végétales aériennes et souterraines, effluents et produits organiques) sont les ressources trophiques. Ce chapitre aborde comment la diversité et l’activité de ces...
Article
Full-text available
Bioenergy woody biomass production shortens the life cycle of carbon and secures energy supplies. However, using fast growing trees in these woody crop systems such as in short rotation coppices (SRCs), implies an increasing risk of depleting the soil nutrient stocks by direct biomass removal and low nutrient return. The aim of this study was to qu...
Article
Full-text available
Nous avons utilisé des capteurs capacitifs en sols possédant une forte proportion de graviers (2 à 13%) et de cailloux (18 à 44%), afin de disposer de mesures d’humidité du sol en continu. Les deux types de matériels testés ont été mis en œuvre sur deux types de sols contrastés : sablo-limoneux en région Centre (Loiret) et argilo-limoneux en région...
Article
Full-text available
Soil microorganisms can control the soil cycles of carbon (C), and depending on their C-use efficiency (CUE), these microorganisms either contribute to C stabilization in soil or produce CO2 when decomposing organic matter. However, little is known regarding the enzyme investment of microbial decomposers and the effects on their CUE. Our objective...
Article
Full-text available
To evaluate carbon (C), nitrogen (N), and phosphorus (P) dynamics during the decomposition process, we investigated the temporal variability of extracellular enzymatic activities (EEA) associated with C, N, and P acquisition in microbial communities from different land uses. We hypothesized that EEA ratios would reveal different primary resource re...
Article
Full-text available
In addition to the effect of litter quality (LQ) on decomposition, increasing evidence is demonstrating that carbon mineralisation can be influenced by the past resource history, mainly through following two processes: (i) decomposer communities from recalcitrant litter environments may have a wider functional ability to decompose a wide range of l...
Research
Poster presented at the TEBIS ("Traits Ecologiques et Biologiques des organIsmes des Sols") meeting (Rouen, France) in October 2015
Article
Full-text available
Increases in nitrogen (N) availability reduce decay rates of highly lignified plant litter. Although microbial responses to N addition are well documented, the chemical mechanisms that may give rise to this inhibitory effect remain unclear. Here, we ask: Why does increased N availability inhibit lignin decomposition? We hypothesized that either (1)...
Conference Paper
La matière lignocellulosique, principal constituant de la biomasse végétale, est généralement quantifiée par des méthodes chimiques. Ces méthodes sont destructives, couteuses en temps d’analyse et parfois critiquables par manque de spécificité des composés ciblés. Une alternative pour quantifier la matière lignocellulosique est la spectroscopie FTI...
Article
Mid-infrared (MIR) and near-infrared (NIR) spectroscopy provide useful information on the molecular composition of biological systems. Because they are sensitive to organic and mineral components, there is a growing interest in these techniques for the development of biomarkers that reflect intrinsic characteristics of plants and their mode of degr...
Article
In addition to the effect of litter quality (LQ) on decomposition, increasing evidence is demonstrating that carbon mineralisation can be influenced by the past resource history, mainly through following two processes: (i) decomposer communities from recalcitrant litter environments may have a wider functional ability to decompose a wide range of l...
Conference Paper
Full-text available
Infrared spectroscopy can provide useful information of the biomass composition and has been extensively used in several domains such as biology, food science, pharmaceutical, petrochemical, agricultural applications, etc. However, not all spectral information are valuable for biomarkers construction or for applying regression or classification mod...
Conference Paper
Full-text available
In this paper, we propose a factor weighted fuzzy c-means clustering algorithm. Based on the inverse of a covariance factor, which assesses the collinearity between the centers and samples, this factor takes also into account the compactness of the samples within clusters. The proposed clustering algorithm allows to classify spherical and non-spher...