Groundwater contribution to streamflow sustains biodiversity and enhances ecosystem services, especially under monsoon-driven climate where stream baseflow is often the only available water resource during the dry season. This study assessed how land use change influences streamflow and its groundwater contribution in the small headwater catchment of Houay Pano (M-TROPICS/MSEC)… Continue Reading
Land use change from annual crops to commercial tree plantations can modify flow and transport processes at the watershed scale, including the fate and transport of fecal indicator bacteria (FIB), such as Escherichia coli. The objective of this study was to provide a comprehensive assessment of the impact of land… Continue Reading
High rainfall intensities on slopes produce runoff and erosion, but seeds are also carried down slope into streams by surface wash, causing weed infestation in lower parts of a river system. This interdisciplinary study was performed in the Houay Pano catchment (M-TROPICS/MSEC in Laos), farmed by smallholders and equipped with… Continue Reading
A documentary film (Dong Cao, des racines & des Hommes, 9’04) featuring Jean-Luc MAEGHT (IRD) and PHAM Dinh Rinh (SFRI) has been shot within the Dong Cao catchment in Vietnam (M-TROPICS/MSEC) to highlight the long term monitoring of the CZO (climate, land use, hydrology, and soil erosion, root density, macrofauna,… Continue Reading
As a transverse action within the OZCAR research infrastructure, IGE organized a workshop on particulate fluxes measurement and monitoring within the critical zone. The long term monitoring of soil erosion, suspended sediments and bedload performed by M-TROPICS was presented, together with related research on land use change impact, river water… Continue Reading
Scientists from the USTH and from the Thuyloi University visited the monitored catchment of Dong Cao, northern Vietnam (M-TROPICS/MSEC). The visit was led by Rinh Pham Dinh (SFRI) and by Jean-Luc Maeght (IRD, iEES-Paris). Visiting scientists discovered the history of the research carried out on this peri-urban watershed (49.7 ha).
Christian Valentin (IRD) coordinated a series of 6 books at ISTE Editions about the role of soils within the critical zone, including in the tropics. Renewed interest for soils is due to the social challenges they are associated to: agricultural productions, climate and biogeochemical cycles regulation, urbanization… By locating soils… Continue Reading
Lancelot Pinta defended a master degree (M2) thesis entitled “Impact of rainfall erosivity and land cover change on total organic carbon accumulation in sediments of a water reservoir in Thailand” on Thursday June 28th at Sorbonne Université (Paris). The objectives of this study were to determine, the amount of catchment-derived… Continue Reading
Floriann Langlet, a master student from the Université de Toulouse III Paul Sabatier, just finished his internship at GET laboratory. He analyzed the occurrence of bacterial pathogens along the Mekong river basin (M-TROPICS/MSEC) and found that soil type, discharge, and turbidity were among the key variables associated to E. coli… Continue Reading
Jean Riotte (IRD-GET) and Laurent Ruiz (INRA/IRD-GET), together with M. Tripti (Post doc IISc) and Nils Dubois (M2 ISTOM), performed a field experiment within the frame of the ANR ATCHA project, aiming at assessing the fate of nitrates from irrigation by groundwater. The experiment was performed in the Berambadi catchment (M-TROPICS/BVET)… Continue Reading
A poster was presented at EGU 2018 Conference by Dr. Kyung Hwa Cho, from UNIST, South Korea, about the modelling of E. coli in Houay Pano catchment (M-TROPICS/MSEC): a research work led by Minjeong Kim in collaboration with GET. The abstract is available here.
A book authored by Yves AUDA has been published, handling the analysis of the critical zone with open-source softwares GRASS and QGIS: field sampling, hydrological models, landscape analysis, remote sensing mapping, digital elevation models, etc. Theory and exercises are based on data from the M-TROPICS/MSEC CZO in Northern Laos, gathered… Continue Reading
This PhD proposal aims at better understanding the transport and fate of pathogen bacteria in tropical areas, e.g. fecal pathogens such as the Fecal Indicator Bacteria (FIB) Escherichia coli and the environmental pathogen Burkholderia pseudomallei. The methods suggested to be implemented in this PhD will be a mix of in… Continue Reading
An inter-disciplinary team at Bengaluru’s Indian Institute of Science (IISc) studied how different tree species partition underground water resources up to 30m depth and co-existing tree species diverge in water uptake depths (M-TROPICS/BVET). Deep rooted trees turn to be more vulnerable to severe droughts than shallow rooted species : climate… Continue Reading
The analyses of silicon isotopes in soil, water and plant compartments of the Mule Hole forested watershed (M-TROPICS/BVET) reveal that vegetation takes up twice more silica than first estimates using elemental mass balance. This flux is 30 times higher than the solute silica flux exported by the stream, itself resulting… Continue Reading
For news and more about #MTROPICS, follow us on Twitter at @mtropics_czo !
This study (M-TROPICS/BVET) identified and quantified the Si sources to rice plants using a solute mass balance at soil-plant scale and the silicon isotopic signatures of the various Si pools. It reveals that the main Si sources are soil amorphous silica, irrigation water and to a lesser extent Si fertilizer… Continue Reading
Jean Luc Maeght, from IRD, explains the research protocol used on the experimental site in Laos (M-TROPICS/MSEC), within the ECOSFIX project. The video, in french, lasts 2’29”.
Jean Luc MAEGHT, from IRD, describes the experimental site of ECOSFIX in Laos, in terms of land use and soil features (M-TROPICS/MSEC). The video, in french, lasts 1’19”.
This video shows the experimental site used for the ECOSFIX project in Laos (M-TROPICS/MSEC) in November 2012 (in french, 10’28”).
Au Nord de la Thaïlande, dans la province de Phrae, une première étude de la sédimentation du réservoir de la Maethang dédié à l’irrigation a eu lieu entre 2004 et 2006, menée par J.-L. Janeau et S. Huon (iEES Paris), leurs étudiants respectifs et leur partenaire thaï du Royal Forest… Continue Reading
In montane Southeast Asia, deforestation and unsuitable combinations of crops and agricultural practices degrade soils at an unprecedented rate. Typically, smallholder farmers gain income from “available” land by replacing fallow or secondary forest by perennial crops. The aim of this study (M-TROPICS/MSEC) was to understand how these practices increase or… Continue Reading
Dr. Olivier Ribolzi, from IRD, promotes the last 15 years of research in Northern Laos, in collaboration with the Ministry of Agriculture and Forestry of Lao PDR, within the frame of the Houay Pano CZO (M-TROPICS/MSEC). Dr. Ribolzi warns about the impacts of rapid land use changes on water and… Continue Reading
A water flow measurements’ training was held from October 28 to November 1, 2013, at Houay Pano CZO (M-TROPICS/MSEC) in Ban Laksip, Luang Prabang Province. The training was organized by IRD, LUSES, iEES Paris, GET and lao (DALaM), thai (NPD) and vietnamese (SFRI) partners. It involved students from universities and… Continue Reading
Short summary of the latest research on the Houay Pano CZO (M-TROPICS/MSEC) dealing with teak expansion, the impact of understorey management on soil surface features and water infiltration, and the consequences of increased surface runoff and soil erosion on pathogens’ transport. Video (4’39) can be watched here.
Combined influence of chemical weathering, atmospheric deposit leaching, and vegetation cycling (Mule Hole watershed, South India): the source and proportion of REY, Th, and U exported by groundwater and by the ephemeral stream along with the elemental proportions passing through vegetation have been assessed in the subhumid tropical forested CZO… Continue Reading
“When John Rowell moved to India in 2012, he had a limited understanding of ‘water problems’. A chance encounter with a member of the Indo-French Cell for Water Sciences led him on a six month journey to better understand our most precious resource…” Full text can be found here.
Soil erosion supplies large quantities of sediments to rivers of Southeastern Asia. It reduces soil fertility of agro-ecosystems located on hillslopes, and it degrades, downstream, water resource quality and leads to the siltation of reservoirs. An increase in the surface area covered with commercial perennial monocultures such as teak plantations… Continue Reading
Insights from high density tubewell monitoring in a hard rock aquifer: agriculture has been increasingly relying on groundwater irrigation for the last decades, leading to severe groundwater depletion and/or nitrate contamination. Understanding the links between nitrate concentration and groundwater resource is a prerequisite for assessing the sustainability of irrigated systems…. Continue Reading