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2 results on '"Hai Tran Sy"'

1. Influence of earthworms and termites on runoff and erosion in a tropical steep slope fallow in Vietnam: A rainfall simulation experiment

Author

Hai Tran Sy, Christian Valentin, Pascal Jouquet, Didier Orange, Luu Thi Nguyet Minh, Alexandro Pisano, and Jean-Louis Janeau

Subjects
Soil biodiversity, Soil Science, Soil science, complex mixtures, Soil retrogression and degradation, Soil ecology, DEGRADATION DU SOL, STABILITE STRUCTURALE, Ecosystem, Ecology, biology, SURFACE DU SOL, TERMITE, Earthworm, biology.organism_classification, Agricultural and Biological Sciences (miscellaneous), JACHERE, Agronomy, Soil water, HYDRODYNAMIQUE, Erosion, Environmental science, EROSION HYDRIQUE, SIMULATION DE PLUIE, Surface runoff, LOMBRIC
Abstract

Earthworms and termites, as soil engineers, play a major role in the regulation of biogeochemical processes and the provision of ecosystem services. They create biogenic aggregates on the soil surface, e.g., earthworm casts and termite sheetings, which can influence soil erosion and the downward transfer of fertility. We assessed the effect of the micro-relief generated by earthworms and termites on soil hydrodynamic properties, and soil and nutrient losses. Eighteen 1 m × 1 m plots were established for rainfall simulation experiments (2 runs of 40 min rain, intensity 90 mm h −1 ) in a steep slope fallow in Northern Vietnam. The soil surface of the micro-plots differed in the proportions of earthworm casts and termite sheetings. The results confirmed the importance of soil biostructures in the regulation of pedohydrological properties of soils. Although globular water-stable earthworm casts promote water infiltration in soil and decrease soil and nutrient losses, the unstable termite sheetings break-down rapidly and generate structural crusts which foster water runoff and soil detachment. No relation was observed between the abundance or biomass of earthworms or termites and the pedohydrological properties measured during the rainfall simulations. This therefore suggests that soil engineers can have greater impact on ecosystem functioning through their biogenic structures rather than as a result of their own abundance or biomass.

Published
2012
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2. Soil erosion, dissolved organic carbon and nutrient losses under different land use systems in a small catchment in northern Vietnam

Author

Hai Tran Sy, Thi Phuong Quynh Le, Pascal Jouquet, Dinh Rinh Pham, Quoc Anh Ngo, Séraphine Grellier, Thi Nguyet Minh Luu, Lc Gillard, Emma Rochelle Newall, Trinh Anh Duc, Christian Valentin, Jean-Louis Janeau, Duc Toan Tran, Didier Orange, Biogéochimie et écologie des milieux continentaux (Bioemco), Centre National de la Recherche Scientifique (CNRS)-AgroParisTech-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA)-École normale supérieure - Paris (ENS Paris), WEO Department, University of sciences and technologies of hanoi (USTH), Université Pierre et Marie Curie - Paris 6 (UPMC), Vietnam Academy of Science and Technology (VAST), A18-Institute of Chemistry, Vietnamese Academy of Science and Technology, Ecologie des systèmes marins côtiers (Ecosym), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS), Soils and Fertilizers Research Institute (SFRI), Vietnam Academy of Agricultural Sciences (VAAS), Veolia Environnement Recherche et Innovation, Veolia, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut d'écologie et des sciences de l'environnement de Paris (iEES Paris), Institut National de la Recherche Agronomique (INRA)-Sorbonne Université (SU)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Biomécanique et Mécanique des Chocs (LBMC UMR T9406), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Institut d'écologie et des sciences de l'environnement de Paris (iEES), Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), UR 103 Camélia, Institut de Recherche pour le Développement (IRD), French Institut de Recherche pour le Developpement (IRD), UMR BIOEMCO, project PAMPA, PHC Hoa Sen Lotus [23970QM], LOTUS [44/2012/HD-NDT], MOST, Vietnam, Institut d'écologie et des sciences de l'environnement de Paris (IEES (UMR_7618 / UMR_D_242 / UMR_A_1392 / UM_113) ), Institut d'écologie et des sciences de l'environnement de Paris (IEES), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), and University of Science and Technology of Hanoi (USTH)

Subjects
FORET, 010504 meteorology & atmospheric sciences, SOL CULTIVE, 01 natural sciences, Agricultural land, Dissolved organic carbon, PERTE EN TERRE, Tropical catchments, DEGRADATION DU SOL, MATIERE ORGANIQUE DISSOUTE, ComputingMilieux_MISCELLANEOUS, Water Science and Technology, 2. Zero hunger, Agroforestry, Aquatic ecosystem, 04 agricultural and veterinary sciences, No-till, Plant litter, CARBONE, PRATIQUE CULTURALE, BASSIN VERSANT, Erosion, [SDE]Environmental Sciences, PENTE, SIMULATION DE PLUIE, COUVERT VEGETAL, Soil Science, TRAVAIL DU SOL, No-till farming, ALTITUDE, AZOTE, ETUDE COMPARATIVE, Ecosystem, Soil carbon loss, 14. Life underwater, 0105 earth and related environmental sciences, Earth-Surface Processes, Rain simulations, PHOSPHORE, Soil carbon, 15. Life on land, NUTRIMENT, JACHERE, Agronomy, MULCH, Acacia mangium, [SHS.ENVIR]Humanities and Social Sciences/Environmental studies, Soil water, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, EROSION HYDRIQUE, Agronomy and Crop Science, ZONE DE MONTAGNE
Abstract

International audience; The export of dissolved organic carbon (DOC) from agricultural soils can represent an important pathway of soil organic carbon loss. However, despite its importance in terrestrial and downstream aquatic ecosystems, most work has focused on temperate agrosystems with tropical and sub-tropical ecosystems being ignored. Here we present the results of a series of rain simulation experiments aimed at examining DOC export from sloping lands in North Vietnam. Three regularly used agricultural practices were tested and compared with Bare soils. We also compared the impact of leaf litter in two planted forest sites. We found high rates of DOC export (0.03-0.25 g C m(-2)) during a 40 min rain episode with the lowest rates observed in the Bare soils and the highest in the planted Forest without leaf litter. This is equivalent to a loss of between 0.001 and 0.008% of the total soil organic carbon in the upper 10 cm during a single, intense rain event. This work highlights the impact of different agricultural practices (Bare soil, hoeing, mulching and fallow) and land use (planted Forest with or without leaf litter) on the export of DOC from upland, tropical soils and further underlines the importance of studying DOC fluxes from agricultural land as it represents an important and highly mobile component of ecosystem carbon fluxes.

Published
2014
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