Frederic Gay

Frederic Gay
Cirad - La recherche agronomique pour le développement | CIRAD · Unité Mixte de Recherche Ecologie Fonctionnelle et Biogéochimie des Sols et des Agro-Écosystèmes (Eco et Sols)

PhD

About

76
Publications
22,135
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550
Citations
Additional affiliations
August 2008 - August 2014
Kasetsart University
Position
  • International expert
Description
  • In charge of the research program on ecophysiology of rubber tree. P.I of the Rubberflux site, an eddy-covariance facility set-up in a rubber plantation.

Publications

Publications (76)
Presentation
Full-text available
This presentation dealt with the restoration of soil health after heavy disturbances in rubber tree plantations in Ivory Coast. We showed that the restitution of logging residues (i.e. the crop residues of the previous rubber stand), combined with a legume cover, made it possible to quickly restore soil functioning.
Conference Paper
Full-text available
After a Rubber plantation cycle (25 to 40 years), the greatest risk of soil degradation occurred during the replanting period which extends from the clear cutting of an old plantation to the planting of young rubber trees. During this period, the soil is subject to numerous disturbances mainly related to (1) the opening up of the environment follow...
Conference Paper
Full-text available
Soil erosion causes major problems of land degradation in agricultural systems leading to losses of soil fertility. Rubber tree is one of the main tropical perennial crops with about 13 million hectares of plantations worldwide in 2018. In the early stage of a rubber plantation, soil is especially vulnerable to degradations given the low canopy cov...
Conference Paper
Full-text available
The purpose of this paper is to present research results relative to impacts of Climate Change on natural rubber production, potential means of adaptation and contribution of rubber to livelihoods resilience to climate change following a recent workshop organized by IRSG in collaboration with 2 CIFOR/FTA, IRRDB and CIRAD. Climate change already imp...
Article
Full-text available
Rubber plantations have rapidly replaced natural forests (NFs) in Mainland Southeast Asia, yet the relevant impacts on the terrestrial carbon cycle remain uncertain especially with an increase in drought frequency. Our study compared eddy‐covariance measurements of carbon and water fluxes from two rubber monoculture plantations (at a northern margi...
Preprint
Aims The effect of tree plantations on soil biological functions when they replace tropical forests is detrimental. However, the current trend is to repeat tree plantations on the same land after clear-cutting, with a probable strong disturbance of soil functions. We addressed this question in rubber plantations, one of the world’s most important t...
Article
Full-text available
Rubber tree plantations (Hevea brasiliensis) cover large areas in the tropics. In historical producing regions like South Thailand, rubber has been planted by smallholders for three successive rotations lasting a total of 75 years. Despite possible consequences on topsoil, the long-term impacts of repeated rubber plantations on soil quality remain...
Preprint
Full-text available
The purpose of this paper is to present research results relative to impacts of Climate Change on natural rubber production, potential means of adaptation and contribution of rubber to livelihoods resilience to climate change following a recent workshop organized by IRSG in collaboration with 2 CIFOR/FTA, IRRDB and CIRAD. Climate change already imp...
Presentation
Full-text available
Les plantations d'hévéas sont largement exploitées sur une période de rotation de 25 à 40 ans (Oku et al. 2012). Après un cycle d’hévéaculture, le risque le plus important de dégradation du sol survient pendant la phase de replantation qui s'étend de l’abattage d'une ancienne plantation à la plantation de jeunes hévéas. Durant cette période, le sol...
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...
Presentation
Full-text available
Dans cette présentation, nous montrons dans un premier temps la forte perturbation des fonctions du sol induite par la phase de replantation (coupe rase, sous-solage, etc.) entre 2 cycles de plantations d'hévéas en Côte d'Ivoire. Dans un deuxième temps, le bénéfice de la restitution des résidus d'abattage et de l'implantation d'une légumineuse sur...
Conference Paper
Full-text available
Le changement d’usage des terres est à l’origine de modifications des écosystèmes, provoquant la perte de nombreuses espèces et entrainant leur substitution par d’autres espèces ayant des traits différents. Dans les plantations d’hévéas, le maintien et la restauration de la biodiversité après des rotations successives est indispensable pour assurer...
Article
The assessment of the impacts of land management on soil quality is crucial in the current environmental context. Among the many approaches available to assess soil quality, most of studies or monitoring programs consist in the measurement of stock measurements using an additive approach of physical, chemical and biological , parameters. More recen...
Article
Rubber trees are the main source of natural rubber (NR). The area occupied by rubber plantations rose from 3.9 million ha in 1961 to 12.5 million ha in 2018. Both the expansion of rubber plantations in marginal zones (prone to biotic and abiotic stress), and long-term rubber tree cultivation in traditional areas, raise questions about the sustainab...
Article
The assessment of the impacts of land-use and management on soil organic carbon (SOC) dynamics is a major environmental concern, as the soil carbon cycle underpins key ecosystem services. However, assessments based on short-term SOC dynamics face methodological and experimental difficulties. Hurisso et al. (2016) proposed a method to assess SOC dyn...
Article
Plants can detect the quality, quantity and direction of light and use it as a signal to adapt their morphogenesis and growth. Thus depending on their light transmission, coloured nets used to protect plants from pests and limit irradiance can also impact plant growth and production. Tomato plants have been grown under blue or red nets transmitting...
Article
Improving the productivity of existing rubber plantations is necessary to cope with the growing demand for natural rubber (NR) while limiting the environmental and social impacts linked to the expansion of rubber cultivation at the expense of natural ecosystems and food crops. The effect of fertilization on NR yield is still unclear and is poorly d...
Poster
Full-text available
Les sols de la Côte d’Ivoire abritent une grande diversité d’organismes. Ils regorgent d’invertébrés mais savez vous réellement qui ils sont et ce qu’ils font ? Ce projet s’inscrit dans la caractérisation temporelle de la biodiversité du sol dans les replantations d’hévéas.
Poster
Full-text available
Soil is an essential component of agroecosystem, sustaining several soil functions such as nutrient cycling supported by biodiversity. However, land use change from natural ecosystem and intensive crop management may trigger heavy disturbances, threatening soil biodiversity and its related functions. To cope with that, soil resilience, defined as t...
Article
The assessment of soil quality is a scientific issue that has been widely debated in the literature for the last twenty years. We developed the Biofunctool® framework to assess soil quality based on an integrative approach that accounts for the link between the physico-chemical properties and the biological activity of soils. Biofunctool® consists...
Article
Full-text available
The rapid expansion of rubber tree plantations in recent decades has been accompanied by dramatic negative ecological and social impacts. Rubber sector stakeholders consequently engaged in sustainable production of rubber. Despite the lack of harvest during the immature stage following planting, this period plays a key role in future yields. Manage...
Article
Conventional, intensively managed coffee plantations are currently facing environmental challenges. The use of shade trees and the organic management of coffee crops are welcome alternatives, aiming to reduce synthetic inputs and restore soil biological balance. However, little is known about the impacts of the different types of shade tree species...
Poster
Full-text available
The capacity of soils to mitigate climate change through carbon sequestration depends on the quantitative but also the qualitative changes in soil organic carbon (SOC). In particular, the stability of SOC has to be considered to evaluate the long-term fate of the soil carbon stocks. The aim of this study was to assess the accurateness of thermal an...
Article
Full-text available
The rapid expansion of perennial crops is a major threat to biodiversity in Southeast Asia. The biodiversity losses related to the conversion of forest lands to oil palm or rubber plantations (RP) are well documented by recent studies. However, the impact of the conversion from intensively managed annual crops to perennial crops on soil biodiversit...
Article
Full-text available
The soil microbial activity is a key parameter in numerous studies aiming to assess soil quality in agricultural plots. Basal Soil Respiration (BSR) has been extensively used as an indicator of this soil microbial activity. However, available methods to measure BSR remain time-and labor-consuming and must be performed in the laboratory which may le...
Conference Paper
Full-text available
This publication reports the mineral composition and the properties of latex and rubber obtained from a fertilizer agronomical trial conducted in Kasetsart University Sitthiporn Kritsadakon Research Station, south Thailand. This trial was designed to study the effect of 4 fertilizer levels on RRIM600 clone trees tapped with the recommended tapping...
Article
Fertilization of rubber plantations has been poorly documented despite the huge economic and ecological impact of this tropical perennial crop, especially in Southeast Asia. The main objective of this paper is to provide information on the fertilization practices of rubber smallholders in Thailand and to investigate the drivers of these practices....
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...
Chapter
Full-text available
Tropical tree plantations are rapidly expanding to meet the growing demand for wood and nonwood forest products. Current research—combining ecophysiology, genetics and functional genomics—aims to enhance the climate change mitigation role of these plantations and their adaptation. The positive effect of the increase in atmospheric carbon dioxide co...
Article
Full-text available
Tropical tree plantations are rapidly expanding to meet the growing demand for wood and nonwood forest products. Current research-combining ecophysiology, genetics and functional genomics-aims to enhance the climate change mitigation role of these plantations and their adaptation. The positive effect of the increase in atmospheric carbon dioxide co...
Article
Full-text available
Latex, the cytoplasm of laticiferous cells localized in the inner bark of rubber trees (Hevea brasiliensis Müll. Arg.), is collected by tapping the bark. Following tapping, latex flows out of the trunk and is regenerated, whereas in untapped trees, there is no natural exudation. It is still unknown whether the carbohydrates used for latex regenerat...
Article
Full-text available
Selection for drought-tolerant clones has become a major challenge in rubber breeding programs undertaken to ensure the sustainability of natural rubber production, as rubber plantations are expanding in drought-prone areas. Xylem vulnerability to cavitation is a trait related to drought-induced mortality. It can be rapidly evaluated without subjec...
Conference Paper
Full-text available
Industrial tree crop plantations often enter in direct competition for land with forests. In those cases, the net result on climate is detrimental. In other cases, the possibility for tree crops to fulfil the objectives of CSA deserves a deeper investigation. This study analyses the case of natural rubber production in Thailand. The natural rubber...
Poster
Full-text available
Industrial tree crop plantations often enter in direct competition for land with forests. In those cases, the net result on climate is detrimental. In other cases, the possibility for tree crops to fulfil the objectives of CSA deserves a deeper investigation. This study analyses the case of natural rubber production in Thailand. The natural rubber...
Article
Full-text available
BACKGROUND Tomato is sensitive to ozone. Fruit growth and composition are altered under ozone stress by modification of reproductive development. Fifty-one-day-old plants were exposed to three concentrations of ozone (200, 350 and 500 mu gm(-3)) for 4h. RESULTSOzone reduced well-developed fruit number and fruit size, but it did not significantly af...
Article
Full-text available
Climate change and fast extension in climatically suboptimal areas threaten the sustainability of rubber tree cultivation. A simple framework based on reduction factors of potential transpiration was tested to evaluate the water constraints on seasonal transpiration in tropical sub-humid climates, according pedoclimatic conditions. We selected a re...
Chapter
Les plantations d'arbres tropicaux sont en expansion rapide pour satisfaire la demande croissante en bois et produits non ligneux. Les recherches actuelles visent à améliorer le rôle d'atténuation du changement climatique de ces plantations ainsi que leur adaptation, en associant écophysiologie, génétique et génomique fonctionnelle. L'effet positif...
Conference Paper
Full-text available
Tree plantations are often denigrated for their negative impact on natural resources particularly loss of biodiversity. This assessment is undeniable when tree plantation encroached natural forests. However, in the case of Rubber plantation, the main tree plantation in south East Asia, it often replaced intensively managed annual crops such as cass...
Article
Full-text available
The crop sensitivity to ozone (O3) is affected by the timing of the O3 exposure, by the O3 concentration, and by the crop age. To determine the physiological response to the acute ozone stress, tomato plants were exposed to O3 at two growth stages. In Experiment I (Exp. I), O3 (500 μg m−3) was applied to 30-d-old plants (PL30). In Experiment II (Ex...
Article
This research improved the model for the radial distribution of the sap flux density in rubber trees. The objective of the study was to describe the radial variability of xylem sap flux in rubber trunks. The experiment was conducted in mature rubber trees aged 13 yr from clone RRIM 600, in a non-traditional planting area at the Chachoengsao Rubber...
Article
Full-text available
Fine roots (FR) play a major role in the water and nutrient uptake of plants and contribute significantly to the carbon and nutrient cycles of ecosystems through their annual production and turnover. FR growth dynamics were studied to understand the endogenous and exogenous factors driving these processes in a 14 year-old plantation of rubber trees...
Article
Full-text available
Natural rubber is a valuable source of income in many tropical countries and rubber trees are increasingly planted in tropical areas, where they contribute to land-use changes that impact the global carbon cycle. However, little is known about the carbon balance of these plantations. We studied the soil carbon balance of a 15-year-old rubber planta...
Article
Full-text available
Drought constraints and transpiration of rubber (Hevea brasiliensis) plantations under different evaporative demand regimes were assessed by the simple water balance model. A lump water model, BILJOU (BILan hydrique JOUrnalier), is the daily water balance model. This model requires daily potential evapotranspiration (ETo) and rainfall as input clim...
Conference Paper
Full-text available
The rubber tree (Hevea brasiliensis) is one of the 5 major economic crops in Thailand. Since 1991, Thailand has been the first country in the world for natural rubber production and export and is still expending the planted surfaces. Nevertheless the most suitable soils for rubber tree growth 1 are rather scare in the region of Thailand where plant...
Article
Full-text available
Transpiration at the leaf and stand level is mainly controlled by climatic conditions. The diurnal dynamics of stand transpiration and stomatal conductance were analyzed in rubber trees. The experiment was conducted using 13 yr-old rubber trees from clone RRIM 600 under natural conditions at the Chachoengsao Rubber Research Center during January to...
Article
Full-text available
The impact of drought conditions on the water relations of rubber trees is important because the trees could shed leaves while they are being continuously tapped. The aim of this work was to study the effect of soil drought and the tapping of latex on the water relations of rubber trees. This study distinguished between untapped trees and trees aff...
Conference Paper
Full-text available
Highlights: A generic leaf area growth model based on the simulation of leaf growth dynamics in response to light microclimate was built, calibrated and validated for three dicotyledonous species.