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Dive into the research topics where B. Soulileuth is active.

Publication


Featured researches published by B. Soulileuth.


Scientific Reports | 2016

Effect of land use and hydrological processes on Escherichia coli concentrations in streams of tropical, humid headwater catchments

Emma Rochelle-Newall; Olivier Ribolzi; Marion Viguier; Chanthamousone Thammahacksa; Norbert Silvera; Keooudone Latsachack; Rinh Pham Dinh; Piyapong Naporn; Hai Tran Sy; B. Soulileuth; Nikom Hmaimum; Pem Sisouvanh; Henri Robain; Jean-Louis Janeau; Christian Valentin; Laurie Boithias; Alain Pierret

Lack of access to clean water and adequate sanitation continues to be a major brake on development. Here we present the results of a 12-month investigation into the dynamics of Escherichia coli, a commonly used indicator of faecal contamination in water supplies, in three small, rural catchments in Laos, Thailand and Vietnam. We show that land use and hydrology are major controlling factors of E. coli concentrations in streamwater and that the relative importance of these two factors varies between the dry and wet seasons. In all three catchments, the highest concentrations were observed during the wet season when storm events and overland flow were highest. However, smaller peaks of E. coli concentration were also observed during the dry season. These latter correspond to periods of intense farming activities and small, episodic rain events. Furthermore, vegetation type, through land use and soil surface crusting, combined with mammalian presence play an important role in determining E. coli loads in the streams. Finally, sampling during stormflow revealed the importance of having appropriate sampling protocols if information on maximum contamination levels is required as grab sampling at a fixed time step may miss important peaks in E. coli numbers.


FEMS Microbiology Ecology | 2018

Vicinal land use change strongly drives stream bacterial community in a tropical montane catchment

Huong T. Le; Emma Rochelle-Newall; Yves Auda; Olivier Ribolzi; Oloth Sengtaheuanghoung; Elisa Thébault; B. Soulileuth; Thomas Pommier

Impact of land use (LU) change on stream environmental conditions and the inhabiting bacterial community remains rarely investigated, especially in tropical montane catchments. We examined the effects of LU change and its legacy along a tropical stream by comparing seasonal patterns of dissolved organic carbon (DOC) / colored dissolved organic matter (CDOM) in relation to variations in structure, diversity and metabolic capacities of particle-attached (PA) and free-living (FL) bacterial communities. We hypothesized that despite seasonal differences, hydrological flows that accumulate allochthonous carbon along the catchment are a major controlling factor of the bacterial community. Surprisingly, local environmental conditions that were largely related to nearby LU and the legacy of LU change were more important for stream bacterial diversity than hydrological connectivity. DOC was strongly correlated with PA richness and diversity. The legacy of LU change between teak plantation and annual crops induced high DOC and high diversity and richness of PA in the adjacent waters, while banana plantations were associated with high diversity of FL. The community structures of both PA and FL differed significantly between seasons. Our results highlight the importance of vicinal LU change and its legacy on aquatic bacterial communities in mixed used tropical watersheds.


Agriculture, Ecosystems & Environment | 2010

Possibilities of carbon and nitrogen sequestration under conventional tillage and no-till cover crop farming (Mekong valley, Laos)

A. de Rouw; Sylvain Huon; B. Soulileuth; Pascal Jouquet; Alain Pierret; Olivier Ribolzi; Christian Valentin; Emmanuel Bourdon; B. Chantharath


Journal of Hydro-environment Research | 2015

Field and modelling studies of Escherichia coli loads in tropical streams of montane agro-ecosystems

Jean Causse; Gilles Billen; Josette Garnier; Thierry Henri-des-Tureaux; Xaypaseuth Olasa; Chanthamousone Thammahacksa; Keo Oudone Latsachak; B. Soulileuth; Oloth Sengtaheuanghoung; Emma Rochelle-Newall; Olivier Ribolzi


Weed Research | 2014

Soil seedbanks in slash-and-burn rice fields of northern Laos

A. de Rouw; M. Casagrande; K. Phaynaxay; B. Soulileuth; K. Saito


Hydrology and Earth System Sciences Discussions | 2015

Afforestation by natural regeneration or by tree planting: examples of opposite hydrological impacts evidenced by long-term field monitoring in the humid tropics

Guillaume Lacombe; Olivier Ribolzi; Anneke de Rouw; Alain Pierret; Keo Oudone Latsachak; Norbert Silvera; R. Pham Dinh; D. Orange; Jean L. Janeau; B. Soulileuth; H. Robain; A. Taccoen; P. Sengphaathith; Emmanuel Mouche; Oloth Sengtaheuanghoung; T. Tran Duc; Christian Valentin


The Journal "Agriculture and Forestry | 2008

Effect of fallow regrowth on stream water yield in a headwater catchment under shifting cultivation in Northern Lao PDR

Olivier Ribolzi; Jean-Pierre Thiébaux; Emmanuel Bourdon; Jean-Pierre Bricquet; Vincent Chaplot; Sylvain Huon; Pierre Marchand; Emmanuel Mouche; Alain Pierret; Henri Robain; Anneke de Rouw; Oloth Sengtaheuanghoung; B. Soulileuth; Christian Valentin


Soil Use and Management | 2018

The transition from arable lands to rubber tree plantations in northern Thailand impacts weed assemblages and soil physical properties

M. Neyret; Henri Robain; A. de Rouw; B. Soulileuth; K. Trisophon; K. Jumpa; Christian Valentin


Agriculture, Ecosystems & Environment | 2018

Weed seed dispersal via runoff water and eroded soil

Anneke de Rouw; Olivier Ribolzi; Mathilde Douillet; Hatsadong Tjantahosong; B. Soulileuth


Archive | 2017

Conversion of traditional cropland into teak plantations strongly increased soil erosion in montane catchments of Southeastern Asia [Abstract only]

Olivier Evrard; Olivier Ribolzi; Sylvain Huon; A. de Rouw.; Norbert Silvera; K. O. Latsachack; B. Soulileuth; Irène Lefèvre; Guillaume Lacombe; Oloth Sengtaheuanghoung; Christian Valentin

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Alain Pierret

Institut de recherche pour le développement

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Emmanuel Bourdon

Institut de recherche pour le développement

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Emma Rochelle-Newall

Centre national de la recherche scientifique

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Henri Robain

Centre national de la recherche scientifique

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Anneke de Rouw

Institut de recherche pour le développement

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Christian Valentin

Centre national de la recherche scientifique

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Christian Valentin

Centre national de la recherche scientifique

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Emmanuel Mouche

Centre national de la recherche scientifique

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