jean-luc Maeght

jean-luc Maeght
Institute of Research for Development | IRD · IRD 123 BotAnique et Modélisation de l'Architecture des Plantes et Végétations - Institue of Ecology and Environment de Paris iEES Paris

Research Engineer - Ph.D. Biophysics of root-soil interactions Deep Root - IRD- AMAP - iEES Paris

About

116
Publications
25,416
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Introduction
My current activities on team research interests include (i) investigating the links between land use, root growth dynamics and soil erosion in the mountain environments of Northern Lao P.D.R. and Vietnam in DongCao catchment, (ii) understanding root-soil interactions and crop-intercrop competition processes in rubber tree plantations of NE Thailand and Vietnam, (iii) investigating the long term impact of agricultural practices on the environment and teak plantation, in Northern Lao P.D.R and natural regrows forest Vietnam on DongCao catchement. Summary of project on this web documentaire : Des Racines et des Hommes – Roots and Man on YouTube IRD
Additional affiliations
October 2019 - present
Institute of Research for Development
Position
  • Deep Root Biophysics of root-soil interactions
September 2015 - August 2019
Soils and Fertilizers Research Institute (SFRI)
Position
  • Biophysics of root-soil interactions
Description
  • Soils and Fertilizers Research Institute (SFRI) SFRI is a public science unit belonging to Vietnam Academy of Agricultural Sciences (VAAS), ...
September 2008 - September 2013
National Agriculture and Forestry Research Institute (NAFRI)
Position
  • Deep Root Biophysics of root-soil interactions

Publications

Publications (116)
Article
Termites are key soil bioturbators in tropical ecosystems. Apart from mound nests constructed by some advanced lineages, most of the species use their faeces, oral secretions, debris, or soil aggregates to protect themselves from predators and desiccation when they go out to forage. Although this soil ‘sheeting’ is considered to play a key role in...
Article
Full-text available
Vegetation processes are fundamentally limited by nutrient and water availability, the uptake of which is mediated by plant roots in terrestrial ecosystems. While tropical forests play a central role in global water, carbon, and nutrient cycling, we know very little about tradeoffs and synergies in root traits that respond to resource scarcity. Fro...
Article
Full-text available
Vegetation processes are fundamentally limited by nutrient and water availability, the uptake of which is mediated by plant roots in terrestrial ecosystems. While tropical forests play a central role in global water, carbon, and nutrient cycling, we know very little about tradeoffs and synergies in root traits that respond to resource scarcity. Fro...
Article
This study is aimed at studying the influence of organic fertilization on coffee growth and its resistance to drought. The experiment was carried out on young coffee plantlets in a greenhouse in Viet Nam and compared three varieties (Arabica L, Robusta TR9, and Robusta M38) and two types of organic amendments (compost or vermicompost). This study s...
Article
Soil macroporosity is a highly dynamic feature driven by numerous physical and biological processes, of which bioturbation, the movement of water in soil and swelling and shrinking cycles are the main processes. To date, the interaction between these factors, especially how galleries produced by soil fauna respond to rainwater percolation and wetti...
Article
Full-text available
By ingesting soil and organic matter in different soil horizons and depositing casts on soil surface, anecic earthworms have large influence on soil ecological processes. However, we still have a limited understanding of the consequences of earthworm casting activity on nematode communities, and the role played by the land use in this relationship....
Article
Mountain regions of the humid tropics are characterized by steep slopes and heavy rains. These regions are thus prone to both high surface runoff and soil erosion. In Southeast Asia, uplands are also subject to rapid land-use change, predominantly as a result of increased population pressure and market forces. Since 1998, the Houay Pano site, locat...
Article
Soil is considered as a non-renewable resource, which may be lost in sloping land more rapidly than it is formed thus leading to loss of fertility and ecosystem deterioration. We hypothesized that earthworms could counteract this process due to their cast forming activity. To test this hypothesis, we quantified the production of casts in small plot...
Article
Full-text available
Intensive coffee production is accompanied by several environmental issues, including soil degradation, biodiversity loss, and pollution due to the wide use of agrochemical inputs and waste generated by processing. In addition, climate change is expected to decrease the suitability of cultivated areas while potentially increasing the distribution a...
Article
Understanding the variables explaining earthworm cast properties remains a key challenge in soil ecology. For this purpose, this study aimed to determine the relationships between the physical and chemical properties of earthworm casts and those of their surrounding soil environment. Surface earthworm casts (recently emitted or degraded) produced b...
Article
By creating vertical and continuous burrows, anecic earthworms accelerate the transfer of water in soils. However, the degradation mechanisms and lifespan of burrows and the consequence of changes in burrow characteristics for water infiltration remain poorly known. In this study, the dynamics of the degradation and hydraulic properties of burrows...
Article
Full-text available
Key message In this study, deep roots of teak tree seem to have acted as a “safety net”, allowing trees to maintain their canopy cover longer, thus coping with inter- and intra-seasonal drought. Abstract Most deciduous species of dry monsoon forest, such as teak tree (Tectona grandis Linn F.), establish new foliage slightly before, or at the onset...
Poster
Full-text available
This study suggests that fine roots play an important role in the interaction with microbial communities all along the soil profile. The presence of roots deep in the soil profile, in agroforest systems and natural vegetation, should be taken into account as a significant contributor to belowground ecosystem services and long-term carbon storage.
Poster
Full-text available
In agroforests, if the role of tree lines as physical barriers to runoffs is easily understanding, processes involving rooting systems and soil erodilbility are still unknown.
Poster
Full-text available
Les racines profondes des arbres peuvent ancrer les couches de sol « mou » dans la roche « dure », comme l’ancre d’un bateau empêche celui-ci de dériver.
Poster
Full-text available
Researches axes on Environmental impacts of land use change ans soil ecosystem engineers in Vietnam.
Article
The expansion of rubber cultivation into drought prone areas calls for innovative management to increase the drought resistance of the trees. The competition for water exerted by an intercrop in the upper soil layers will likely stimulate the growth of young rubber tree roots into deeper soil layers where water availability is more stable. This stu...
Article
Full-text available
In many tropical regions, such as New Caledonia, soil erosion from anthropogenic activities and subsequent ecological restoration are major issues that require detailed soil and vegetation data for the production of management plans. To determine if some plant species are more useful for stabilizing soil aggregates and thus reducing erodibility, we...
Article
Full-text available
Melioidosis, a severe infection with the environmental bacterium Burkholderia pseudomallei, is being recognised increasingly frequently. What determines its uneven distribution within endemic areas is poorly understood. We cultured soil from a rice field in Laos for B. pseudomallei at different depths on 4 occasions over a 13-month period. We also...
Research
Full-text available
Study roots from wells and scanner technics Maeght Jean-Luc, Clément Corentin, Gonkhamdee Santimaitree, Isarangkool Na Ayutthaya Supat, Stokes Alexia, Pierret Alain .Seasonal patterns of fine root production and turnover in a mature rubber tree (Hevea brasiliensis Müll. Arg.) stand - differentiation with soil depth and implications for soil carbon...
Article
Although vegetation is increasingly used to mitigate landslide risks, how vegetation affects the temporal variability of slope stability is poorly understood, especially in earthquake-prone regions. We combined 3-year long soil moisture monitoring, measurements of soil physical properties and plant functional traits, and numerical modeling to compa...
Article
Full-text available
Background Belowground processes play an essential role in ecosystem nutrient cycling and the global carbon budget cycle. Quantifying fine root growth is crucial to the understanding of ecosystem structure and function and in predicting how ecosystems respond to climate variability. A better understanding of root system growth is necessary, but cho...
Article
Full-text available
Although vegetation is increasingly used to mitigate landslide risks, how vegetation affects the temporal variability of slope stability is poorly understood, especially in earthquake-prone regions. We combined 3-year long soil moisture monitoring, measurements of soil physical properties and plant functional traits, and numerical modeling to compa...
Article
Full-text available
In Northeastern Thailand, dipterocarp forest has been cut massively in recent decades to be gradually replaced by cash crops. The aerial parts of the vegetation were sold or burned while underground parts have been degraded with time on site by microbial activity that converts the plant tissues in organic matter more or less mineralized (humus). A...
Article
Full-text available
Background Deep roots are a common trait among a wide range of plant species and biomes, and are pivotal to the very existence of ecosystem services such as pedogenesis, groundwater and streamflow regulation, soil carbon sequestration and moisture content in the lower troposphere. Notwithstanding the growing realization of the functional significan...
Article
Full-text available
Fine root dynamics is a main driver of soil carbon stocks, particularly in tropical forests, yet major uncertainties still surround estimates of fine root production and turnover. This lack of knowledge is largely due to the fact that studying root dynamics in situ, particularly deep in the soil, remains highly challenging. We explored the interact...
Poster
Full-text available
Session 2 Integrated Soil Management and Conservation for Food Security POSTER Deep Root Biomass and Interfluve Aquifer: Case of a Watershed in Northeast Thailand
Conference Paper
Full-text available
Storing more carbon in soils, particularly at depth, could be an effective and readily available means to mitigate climate change. Current estimates of soil organic carbon (SOC) are based on sampling the first 30 cm of soil. Deep soils abound worldwide, particularly in the tropics, and many plants are known to grow deep root systems. In addition, r...
Presentation
Full-text available
Effet d’une sécheresse induite sur la physiologie du Teck. Une vidéo décrivant le site expérimental utilisé dans le cadre du projet ECOSFIX au Laos. Réalisé par A. Pierret et J.L.Maeght (Bioemco, IRD).
Conference Paper
Full-text available
Pourquoi les sols peuvent être instables ? Quelles conséquences pour l'homme ? Quel rôle pour les racines ?
Conference Paper
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Soil erosion in farmlands is a major cause of water quality degradation and reduced crops production potential throughout the European countries. In agroforests, if the role of tree lines as physical barriers to runoffs is easily understanding, processes involving rooting systems and soil erodilbility are still unknown. Objectives-Do the presence o...
Article
Full-text available
Le rôle méconnu des racines profondes
Article
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Aim This study aims to improve our understanding of temporal variations and controlling factors of soil respi-ration (R s) and its components (microbial respiration or R m and root respiration or R b) in an Asian tropical seasonal forest at diurnal, seasonal and annual timescales in relation to biotic and abiotic controls. Methods R s was studied b...
Article
There is a fundamental trade-off between leaf traits associated with either resource acquisition or resource conservation. This gradient of trait variation, called the economics spectrum, also applies to fine roots, but whether it is consistent for coarse roots or at the plant community level remains untested. We measured a set of morphological and...
Chapter
Full-text available
Melioidosis is a serious infectious tropical disease caused by a soil-dwelling bacterium, Burkholderia pseudomallei, transmitted from contaminated soil or surface water. Although endemic in Southeast Asia, it is considered an emerging disease in Lao PDR where it has only been recognised for 15 years, becoming one of the leading causes of community-...
Article
Full-text available
For almost two decades, the French Institut de Recherche pour le Développement (IRD) has been working in partnership with the Soils and Fertilizer Research Institute (SFRI) to study soil erosion and land use change in the small catchment of Dong Cao, Tien Xuan, North Vietnam. This partnership forms one of the main pillars of the regional Multi - Sc...
Conference Paper
Full-text available
Abstract: For almost two decades, the French Institut de Recherche pour le Développement (IRD) has been working in partnership with the Soils and Fertilizer Research Institute (SFRI) to study soil erosion and land use change in the small catchment of Dong Cao, Tien Xuan, North Vietnam. This partnership forms one of the main pillars of the regional...
Conference Paper
Full-text available
Abstract: For almost two decades, the French Institut de Recherche pour le Développement (IRD) has been working in partnership with the Soils and Fertilizer Research Institute (SFRI) to study soil erosion and land use change in the small catchment of Dong Cao, Tien Xuan, North Vietnam. This partnership forms one of the main pillars of the regional...
Article
Full-text available
1.There is a fundamental trade-off between leaf traits associated with either resource acquisition or resource conservation. This gradient of trait variation, called the economics spectrum also applies to fine roots but whether it is consistent for coarse roots or at the plant community level remains untested.2.We measured a set of morphological an...
Article
The root system is essential but essentially invisible. It is a vital link between the plant and the soil but remains largely unstudied as a whole. Plants are anchored to the soil through their root system; their adaptation and survival abilities are highly dependent on their ability to learn to take advantage of the space that surrounds them. Cert...
Thesis
Le système racinaire, lien essentiel entre la plante et le sol quoi qu'essentiellement invisible, reste encore aujourd'hui peu étudié dans son ensemble. Les plantes étant ancrées au sol via leur système racinaire, leurs facultés d'adaptation et de survie sont donc très dépendantes de leurs capacités à savoir tirer profit de l'espace qui les entoure...
Article
Full-text available
While soil erosion is reasonably well documented at the plot scale, data remain scarce at the catchment scale and predominantly stem from short-term studies. In this context, the “Management of Soil Erosion Consortium” network, which recently became the Multi-Scale Environmental Changes observatory (MSEC3, http://www.msec3.net/portal/), was establi...
Article
Full-text available
De nombreux petits agriculteurs du sud-est asiatique développent actuellement des plantations d'hévéa (Hevea brasiliensis Muell. Arg.) dans des régions peu propices à cet arbre du point de vue pédoclimatique. Ceci se traduit par des délais importants d'entrée en production des arbres et des risques d'érosion des sols. L'introduction de plantes de c...
Article
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Background and aims This paper provides an overview of the measuring capabilities of IJ_Rhizo, an ImageJ macro that measures scanned images of washed root samples. IJ_Rhizo is open-source, platform-independent and offers a simple graphic user interface (GUI) for a main audience of non-programmer scientists. Being open-source based, it is also fully...
Conference Paper
Full-text available
The factors determining the distribution of Burkholderia pseudomallei in the environment are poorly understood. We intensively studied a rice paddy in Vientiane Province, Lao PDR, over a 12-month period. Soil samples were collected at the end of the dry season, just after the onset of the rainy season, at the end of the rainy season and at the end...
Article
Full-text available
The drivers underlying the development of deep root systems, whether genetic or environmental, are poorly understood but evidence has accumulated that deep rooting could be a more widespread and important trait among plants than commonly anticipated from their share of root biomass. Even though a distinct classification of "deep roots" is missing t...
Article
Water flow and solute transport in soils forms an essential part in many groundwater hydrology studies. This is especially true for Northeast Thailand, where the agricultural land is affected by the soil salinity, which is a widespread and an increasing phenomenon affecting 25% of the agricultural land. Salinization appears as scattered discrete pa...
Article
The aim of this paper is to summarize the successive biological, pedological, hydrodynamic, geomorphological and geochemical processes that have occurred in the Senegal valley, and to describe how their interactions during the late Holocene conditioned soil cover formation and landscape evolution. Potential acidity accumulated as pyrite in the floo...
Article
Full-text available
Effects of soil and atmospheric drought on whole-tree transpiration (E(T)), leaf water potential (Ψ(L)) and whole-tree hydraulic conductance (K(T)) were investigated in mature rubber trees (Hevea brasiliensis, clone RRIM 600) during the full canopy stage in the rainy season in a drought-prone area of northeast Thailand. Under well-watered soil cond...
Article
Trunk phloem necrosis (TPN) is a major constraint in rubber (Hevea brasiliensis) plantations. Current knowledge supports a scenario of a multi-factor physiological ‘disease’ caused by an accumulation of endogenous and exogenous stresses. Without evidence of a pathogen, the apparent spread of the syndrome from tree to tree along the planting line, s...
Chapter
Soil biomass comprises a tiny proportion of the total soil mass, and plays a dominant role in delivering the wide range of ecosystem services provided by soil systems. The soil biota create physical structure within their habitat, affect the resultant dynamics of many soil processes and are themselves affected by such structure. This interplay betw...
Article
This study focused on the variability of rice yield under water and soil salinity risks in farmers’ fields in northeast Thailand. A rice plot was monitored in 24, 16 and 11 farmers’ fields during the rice seasons 2005, 2006 and 2007, respectively. The results emphasized that few plots were continuously submerged during the 2005 season,...
Article
Full-text available
Understanding better the interactions between root systems in associated crops is significant for basic knowledge in plant science and to help designing cropping systems. Current research on inter-specific root interactions concentrates on static descriptions of the horizontal extension of root systems or on the dynamics of provoked root encounters...