Laurent Saint-Andre

Laurent Saint-Andre
French National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Department of Forest, Grassland and Freshwater Ecology

PhD in forest and wood sciences

About

188
Publications
53,882
Reads
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4,723
Citations
Additional affiliations
January 2005 - present
French National Institute for Agriculture, Food, and Environment (INRAE)
Position
  • Head of the Laboratory "Biogeochemistry of Forest Ecosystems"
January 1999 - January 2005
Cirad - La recherche agronomique pour le développement
Position
  • Researcher

Publications

Publications (188)
Article
Full-text available
Background Higher exportation of harvest residues from forests due to increased demand for woody biomass, has reportedly diminished soil mineral resources and may lead to degraded tree nutrition as well as growth. However, as nutrients become less available in the soil, the remobilization of nutrients in biomass tissues (plant internal cycling) hel...
Preprint
Full-text available
Background: Increased exportation of harvest residues from forests, to mitigate excessive demand for woody biomass, have reportedly diminished soil mineral resources and may lead to degraded tree nutrition and tree growth. However, as nutrients become less available in the soil, the remobilization of nutrients in biomass tissues (plant internal cyc...
Article
Full-text available
Eight years of studying coffee ecophysiology and monitoring ecosystem services (ES) in a large coffee farm in Costa Rica revealed several practical recommendations for farmers and policy makers. The cropping system studied within our collaborative observatory (Coffee-Flux) corresponds to a coffee-based agroforestry system (AFS) under the shade of l...
Book
Full-text available
L’initiative « 4 pour 1 000 : les sols pour la sécurité alimentaire et le climat » propose d’augmenter chaque année d’un quatre millième le stock de carbone présent dans tous les sols du monde. À la demande de l’Ademe et du ministère de l’Agriculture et de l’Alimentation, l’Inra (devenu aujourd’hui INRAE) a conduit une étude, centrée sur la France...
Article
Full-text available
Many forest soils are acidic and have very low plant-available pools of magnesium. Past and present sylvicultural, nutritional and/or climatic pressures endured by forest ecosystems can result in net losses of nutrients and ecosystem function losses. Liming with a carbonate product is an alternative to counteract these degradations but the effects...
Article
Full-text available
Accurate and continuous measurement of the subsoil CO2 is critical to better understand the terrestrial and atmosphere gas transfer process. This work aims to develop and field test a specific flow system to continuously measure the soil gas concentration (χc) and understand its main physical drivers. Hourly data measured in situ were collected thr...
Article
Full-text available
Background National forest inventory and forest monitoring systems are more important than ever considering continued global degradation of trees and forests. These systems are especially important in a country like Bangladesh, which is characterised by a large population density, climate change vulnerability and dependence on natural resources. Wi...
Article
Full-text available
The understanding of soil organic matter (SOM) dynamics has considerably advanced in recent years. It was previously assumed that most SOM consisted of recalcitrant compounds, whereas the emerging view considers SOM as a range of polymers continuously processed into smaller molecules by decomposer enzymes. Mainstreaming this new paradigm in current...
Book
Full-text available
This publication is the result of a study carried out by INRA (now INRAE, National Research Institute for Agriculture, Food and the Environment) and IGN (National Institute for Geographic and Forestry Information), at the request of the Ministry of Agriculture and Food and the High Council for Food, Agriculture and Rural Areas. It was conducted by...
Article
Full-text available
The plant-available pools of calcium, magnesium and potassium are assumed to be stored in the soil as exchangeable cations adsorbed on the cation exchange complex. In numerous forest ecosystems, despite very low plant-available pools, elevated forest productivities are sustained. We hypothesize that trees access nutrient sources in the soil that ar...
Article
Forest soil fertility can be defined as a combination of physical, chemical and biological factors characterising the biomass production capacity of the soil. However, numerous ecological variables affect tree growth and the aim of the present study was to investigate the specific influence of soil chemical properties on tree productivity at 49 aci...
Article
Many forest ecosystems are developed on acidic and nutrient-poor soils and it is not yet clearly understood how forests sustain their growth with low nutrient resources. In forestry, the soil chemical fertility is commonly defined, following concepts inherited from agronomy, as the pool of plant-available nutrients in the soil at a given time compa...
Article
Full-text available
Plants are enormously diverse in their traits and ecological adaptation, even within given ecosystems, such as tropical rainforests. Accounting for this diversity in vegetation models poses serious challenges. Global plant functional trait databases have highlighted general trait correlations across species that have considerably advanced this rese...
Article
Key message Local site-level calibration of allometric models was scrutinized. Two Bayesian calibration methods were compared to local random effects estimations. The Bayesian calibration methods proved more effective than local estimation of random effects in reducing prediction bias. The simplest literature-based calibration can be recommended. T...
Technical Report
Full-text available
http://institut.inra.fr/Missions/Eclairer-les-decisions/Etudes/Toutes-les-actualites/Stocker-4-pour-1000-de-carbone-dans-les-sols-francais
Article
Full-text available
In a context of global changes, modeling and predicting the dynamics of soil carbon stocks (CSs) in forest ecosystems are vital but challenging. Yasso07 is considered to be one of the most promising models for such a purpose. We examine the accuracy of its prediction of soil carbon dynamics over the whole French metropolitan territory at a decennia...
Article
Full-text available
Key message Volume predictions of sample trees are basic inputs for essential National Forest Inventory (NFI) estimates. The predicted volumes are rarely comparable among European NFIs because of country-specific dbh-thresholds and differences regarding the inclusion of the tree parts stump, stem top, and branches. Twenty-one European NFIs implemen...
Article
A growing demand for renewable carbon (C) has led to intensified forest management resulting in the use of forest residues (e.g. canopy, bark or litter layer) as energy sources with potential modifications of soil properties and tree productivity. Because microbes mediate the recycling of C and nutrients sequestered in organic matter, we investigat...
Article
Numerous studies predict a short-term important decrease in fossil resources and stress the need to develop alternative renewable energies, thus European countries aim at increasing biomass production for energetic purposes. One such source of bioenergy could be obtained from forest biomass pools by exporting logging residues, yet this practice wou...
Article
Full-text available
The relationship between forest productivity and tree species diversity has been described in detail, but the underlying processes have yet to be identified. One important issue is to understand which processes are at the origin of observed aboveground overyielding in some mixed forests. We used a beech–maple plantation exhibiting aboveground overy...
Article
Harvest residue management is a key issue for the sustainability of Eucalyptus plantations established on poor soils. Soil microbial communities contribute to soil fertility by the decomposition of the organic matter (OM), but little is known about the effect of whole-tree harvesting (WTH) in comparison to stem only harvesting (SOH) on soil microbi...
Article
Fungal succession in rotting wood shows a surprising abundance of ectomycorrhizal (EM) fungi during the late decomposition stages. To better understand the links between EM fungi and saprotrophic fungi, we investigated the potential capacities of the EM fungus Paxillus involutus to mobilize nutrients from necromass of Postia placenta, a wood rot fu...
Article
Full-text available
In forests, intraspecific genetic variation in trees can affect the entire ecosystem, which in turn, depends on the different processes occurring through space and time in soil. We hypothesized that, in addition to the effect of the local site, tree genotype and season would have an effect on the properties and functions of the edaphic environment....
Article
Full-text available
Facing global changes, modeling and predicting the dynamics of soil carbon stock of forest ecosystems is vital but challenging work. Yasso07 is considered as one of the most promising models for such a purpose. We aim at examining the prediction accuracy of Yasso07 on soil carbon dynamics over the whole French metropolitan territory at a decennial...
Article
Full-text available
Human activities have altered continental ecosystems worldwide and generated a major environmental crisis, prompting urgent societal questions on how to best produce goods while at the same time securing sustainable ecological services and raising needs to better understand and predict biodiversity and ecosystems dynamics under global changes. To t...
Article
Full-text available
Most forest ecosystems grow on acid and nutrient poor soils. In many cases, a slow degradation of forest soil chemical fertility due to increasing external pressures (decreasing atmospheric inputs, intensification of biomass harvesting and silvicultural practices) has been observed and is a growing concern in the international forest community. Whe...
Chapter
Full-text available
Land use change, along with the release of carbon (C) as carbon dioxide, constitutes a major source of emissions that contribute to climate change. Consequently, accurate carbon stock estimation is required to both inform and mitigate climate change. This study determined the importance of five C pools, including above-ground biomass (AGB), below-g...
Article
In forest ecosystems, the specific influence of soil resources on stand productivity is difficult to assess because many other ecological variables also affect tree growth. In this study, we took advantage of a natural soil gradient, from shallow calcic soil to deep acidic soil, all with similar climate, atmospheric depositions, species composition...
Conference Paper
Full-text available
Most forest ecosystems grow on acid and nutrient poor soils. In many cases, the chemical fertility of forest soils is slowly degrading due to increasing external pressures (e.g. decreasing atmospheric inputs, increasing biomass expor-tations) and is a growing concern in the international forest community. Forest liming with a carbonate product is a...
Technical Report
Full-text available
Le rapport (102 p.) et les annexes (234 p.) sont disponibles en ligne à l’adresse suivante : http://institut.inra.fr/Missions/Eclairer-les-decisions/Etudes/Toutes-les-actualites/Forets-filiere-foret-bois-francaises-et-attenuation-du-changement-climatique. Quel rôle pour les forêts et la filière forêt-bois françaises dans l’atténuation du changemen...
Conference Paper
Full-text available
Eight years of monitoring ecophysiology and ecosystem services (ES) in a large coffee farm of Costa Rica yields a range of practical applications for the farmer and stakeholders, thanks to numerous scientific actors and disciplines contributing to our collaborative observatory (Coffee-Flux). • A lot of ecosystem services depend on the soil properti...
Article
Full-text available
In agroforestry systems, shade trees strongly affect the physiology of the undergrown crop. However, a major paradigm is that the reduction in absorbed photosynthetically active radiation is, to a certain extent, compensated by an increase in light-use efficiency, thereby reducing the difference in net primary productivity between shaded and non-sh...
Presentation
Full-text available
Les forêts, regardées ici comme des ressources, vont se transformer au cours des prochaines décennies, à la fois passivement et de manière programmée, sous l’effet conjugué du changement climatique et de l’évolution des pratiques de gestion. L’objectif de cette communication, réalisée à la demande de l’IGN, est de situer le rôle que doit et va joue...
Article
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article présenté lors du Colloque CIAg "Une bioéconomie basée sur la forêt et le bois ?" organisé à Nancy le 8 décembre 2016.
Presentation
Full-text available
Résumé Une bioéconomie fondée sur la forêt et le bois implique de concevoir de nouvelles stratégies de gestion pour simultanément adapter la forêt au changement climatique et lui permettre de répondre aux demandes accrues en visant l’optimisation d’un bilan carbone forêt-bois intégré. Par rapport aux inventaires forestiers tels qu’ils existent aujo...
Presentation
Full-text available
Cette communication situe la recherche de nouveaux matériels forestiers de reproduction vis-à-vis de l’agenda climatique international et du développement de l’économie circulaire, en insistant notamment sur les limites de durabilité des filières énergies renouvelables concurrentes (dépendance aux matières premières). Elle décline ensuite les consé...
Article
Key messageNear- and mid-infrared spectroscopy allows for the detection of local patterns of forest soil properties. In combination with dendrometric data, it may be used as a prospective tool for determining soil heterogeneity before setting up long-term forest monitoring experiments. ContextForest soils and stands generally exhibit higher spatial...
Article
In this paper, a family of first-order hyperbolic integro-differential equations introduced to model the decomposition of organic matter (OM) are studied. These original equations depend on an extra variable named "quality". We prove that these equations admit solutions in particular Banach spaces ensuring the continuity and the N-order closure of...
Article
The compilation of GHG inventories has become a common practice to support environmental decision- and policy-making, for example in the context of the UNFCCC. To estimate GHG emissions, simulation models present viable alternatives to measured data. In order to make an informed decision on model selection, clear information on the purpose and appl...
Conference Paper
Full-text available
Le concept de « sylviculture proche de la nature » a joué un rôle important au cours des 30 dernières années, fournissant une doctrine et un mouvement à une volonté de changement dans les pratiques de gestion. Il a bénéficié, au moins pour la France, d'une conjonction efficace entre une contestation de l'ordre sylvicole établi dans l’après-guerre e...
Article
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Unlike Eucalyptus monocultures, nitrogen fixing trees are likely to improve the soil nutrient status through the decomposition of N-enriched litter. The Home Field Advantage (HFA) hypothesis states that plants can create conditions that increase the decomposition rates of their own litter. However, there may not be any HFA when most of the decompos...
Conference Paper
Full-text available
Estimating tree and forest biomass is a cornerstone of forest resource assessment. In addition to its application in forest-related commerce, forest resource assessment is becoming increasingly crucial in light of continued global deforestation and climate change. The most frequently used methods for estimating forest biomass involve allometric equ...
Article
Full-text available
IntroductionAdvances in ecology face the complexity of ecosystems with dynamics longer than a single scientist’s career. In forestry and REDD+ practice, in particular, our ability to understand forest ecosystem dynamics and to manage them for mitigation and adaptation strongly relies on the combination of long-term research efforts and on data shar...