Your search found 14 records
1 Phommassack, T.; Agus, F.; Boonsaner, A.; Bricquet, Jean P.; Chantavongsa, A.; Chaplot, V.; Ilao, R. O.; Janeau, Jean L.; Marchand, P.; Toan, T. D.; Valentin, Christian. 2003. Factorial analysis of runoff and sediment yield from catchments in Southeast Asia. In Wani, S. P.; Maglinao, A. R.; Ramakrishna, A.; Rego, T. J. (Eds.), Integrated watershed management for land and water conservation and sustainable agricultural production in Asia: Proceedings of the ADB-ICRISAT-IWMI Project Review and Planning Meeting, 10-14 December 2001, Hanoi, Vietnam. Andhra Pradesh, India; Colombo, Sri Lanka; Manila, Philippines: ICRISAT; IWMI; ADB. pp.163-170.
Catchment areas ; Runoff ; Erosion ; Sedimentation ; Water quality ; Statistical analysis ; Regression analysis / South East Asia / Indonesia / Laos / Philippines / Thailand / Vietnam
(Location: IWMI-HQ Call no: IWMI 333.91 G570 WAN Record No: H034989)
(10.29 MB)
2 Chaplot, V.; Chanthavongsa, A.; Agus, F.; Boosaner, A.; Ilao, R. O.; Toan, T. D.; Valentine, Christian; Silvera, Norbert. 2003. Evaluation of environmental factors and soil erosion in MSEC catchments. In Maglinao, Amado R.; Valentin, Christian; Penning de Vries, Frits (Eds.), From soil research to land and water management: Harmonizing people and nature – Proceedings of the IWMI-ADB Project Annual Meeting and 7th MSEC Assembly. Bangkok, Thailand: IWMI. pp.125-134.
Erosion ; Catchment areas ; Environmental effects ; Runoff ; Sedimentation ; Statistical analysis / Laos
(Location: IWMI-HQ Call no: IWMI 631.45 G570 MAG Record No: H036269)
(0.81 MB)
3 Chaplot, V.; Saleh, A.; Jaynes, D. B.; Arnold, J. 2003. Application of soil and water assessment tool (SWAT) to flat landscapes with tiles and potholes: Part II – Predicting water, nutrient and sediment fluxes according to scenarios of land-use changes: Case of Walnut Creek intensively farmed watershed (Iowa) Paper presented at ASAE Annual Meeting 2003. 31p.
Land use ; Hydrology ; Simulation models ; Erosion ; Nitrogen ; Sedimentation ; Farming systems ; Watersheds
(Location: IWMI-HQ Call no: 631.7.1 G430 CHA Record No: H037211)
4 Chaplot, V.; Walter, C. 2004. Some possible ways to improve soil-landscape models for the spatial estimation of soil properties within landscapes: Cast of the Armorican Massif (Western France) In Eswaran, H.; Vijarnsorn, P.; Vearasilp, T.; Padmanabhan, E. (Eds.). Innovative techniques in soil survey: Developing the foundation for a new generation of soil resource inventories and their utilization. Bangkok, Thailand: Land Development Department. pp.43-55.
(Location: IWMI-HQ Call no: 631.4 G000 ESW Record No: H037547)
5 Chaplot, V.; le Brozec, E. C.; Silvera, N.; Valentin, Christian. 2005. Spatial and temporal assessment of linear erosion in catchments under sloping lands of northern Laos. Catena, 63(1-3):167-184.
(Location: IWMI-HQ Call no: IWMI 631.45 G708 CHA Record No: H037483)
6 Chaplot, V.; Giboire, G.; Marchand, Pierre; Valentin, Christian. 2005. Dynamic modelling for linear erosion initiation and development under climate and land-use changes in northern Laos. Catena, 63(2-3):318-328.
(Location: IWMI-HQ Call no: IWMI 631.45 G708 CHA Record No: H037484)
7 Rumpel, C.; Chaplot, V.; Planchon, O.; Bernadou, J.; Valentin, Christian; Mariotti, A. 2006. Preferential erosion of black carbon on steep slopes with slash and burn agriculture. Catena, 65(1):30-40.
(Location: IWMI-HQ Call no: IWMI 631.45 G708 RUM Record No: H038783)
8 Chaplot, V.; Khampaseuth, X.; Valentin, Christian; Le Bissonnais, Y. 2007. Interrill erosion in the sloping lands of northern Laos subjected to shifting cultivation. Earth Surface Processes and Landforms, 32(3):415-428.
Erosion ; Runoff ; Soil crusts ; Soil properties ; Shifting cultivation ; Sloping land ; Runoff ; Land use ; Land management / South East Asia / Laos
(Location: IWMI HQ Call no: IWMI 631.45 G708 CHA Record No: H040754)
In this study our main objective was to quantify water interrill erosion in the sloping lands of Southeast Asia, one of the most bio-geochemically active regions of the world. Investigations were performed on a typical hillslope of Northern Laos subjected to slash and burn agriculture practiced as shifting cultivation. Situations with different periods of the shifting cultivation cycle (secondary forest, upland rice cultivation following a four-year fallow period and three-year continuous upland rice cultivation) and soil orders (Ultisols, Alfisols, Inceptisols) were selected. One metre square micro-plots were installed to quantify the soil material removed by either detachment of entire soil aggregate or aggregate destruction, and the detached material transported by thin sheet flow, the main mechanisms of interrill erosion. In addition, laboratory tests were carried out to quantify the aggregate destruction in the process of water erosion by slaking, dispersion and mechanical breakdown. The average runoff coefficient (R) evaluated throughout the 2002 rainy season was 30·1 per cent and the interrill erosion was 1413 g m-2 yr-1 for sediments and 68 g C m-2 yr-1 for soil organic carbon, which was relatively high. Among the mechanisms of interrill water erosion, aggregate destruction was low and mostly caused by mechanical breakdown due to raindrops, thus leading to the conclusion that detachment and further transport by the shallow runoff of macro-aggregates predominates. R ranged from 23·1 to 35·8 per cent. It decreased with the proportion of mosses on the soil surface and soil surface coverage, and increased with increasing proportion of structural crust, thus confirming previous results. Water erosion varied from 621 to 2433 g m-2 yr-1 for sediments and from 31 to 146 g C m-2 yr-1 for soil organic carbon, and significantly increased with increasing clay content of the surface horizon, probably due to the formation of easily detachable and transportable sand-size aggregates, and proportion of macro-aggregates not embedded in the soil matrix and prone to transport. In addition, water erosion decreased with increasing proportion of structural crusts, probably due to their higher hardness, and when cultivation follows a fallow period rather than after a long period of cultivation due to the greater occurrence of algae on the soil surface, which affords physical protection and greater aggregate stability through binding and gluing. This study based on simultaneous field and laboratory investigations allowed successful identification and quantification of the main erosion mechanisms and controlling factors of interrill erosion, which will give arguments to further set up optimal strategies for sustainable use of the sloping lands of Southeast Asia.
9 Valentin, Christian; Agus, F.; Alamban, R.; Boosaner, A.; Bricquet, J. P.; Chaplot, V.; de Guzman, T.; de Rouw, A.; Janeau, J. L.; Orange, Didier; Phachomphonh, K.; Phai, Do Duy; Podwojewski, P.; Ribolzi, O.; Silvera, N.; Subagyono, K.; Thiebaux, Jean-Pierre; Toan, Tran Duc; Vadari, T. 2008. Runoff and sediment losses from 27 upland catchments in Southeast Asia: impact of rapid land use changes and conservation practices. Agriculture, Ecosystems and Environment, 128:225-238.
Runoff ; Sedimentation ; Catchment areas ; Land use ; Erosion ; Upland rice ; Maize ; Cassava ; Shifting cultivation ; Farming systems ; Soil conservation ; Sloping land / Southeast Asia / Indonesia / Laos / Philippines / Thailand / Vietnam
(Location: IWMI HQ Call no: IWMI 631.45 G800 VAL Record No: H041507)
10 Rumpel, C.; Chaplot, V.; Chabbi, A.; Largeau, C.; Valentin, Christian. 2008. Stabilisation of HF soluble and HCl resistant organic matter in sloping tropical soils under slash and burn agriculture. Geoderma, 145:347-354.
Sloping land ; Shifting cultivation ; Tropical soils ; Climatic soil types ; Erosion ; Soil profiles / Laos / Luang Prabang
(Location: IWMI HQ Call no: IWMI 631.4 G708 RUM Record No: H041554)
11 Valentin, Christian; Lestrelin, Guillaume; Chanthavongsa, A.; Phachomphon, K.; de Rouw, Anneke; Chanhphengxay, A.; Chaplot, V.; Bourdon, Emmanuel; Briquet, J. P.; Marchand, P.; Pierret, Alain; Ribolzi, Olivier; Thiebaux, Jean-Pierre. 2008. The MSEC project in the Lao PDR at a glance: biophysical and socio-economic background and project experimental set up. Lao Journal of Agriculture and Forestry, Special issue no.17:32-50.
Erosion ; Runoff ; Land use ; Policy ; Crop production ; Catchment areas ; Rice ; Shifting cultivation ; Social aspects / Laos
(Location: IWMI HQ Call no: e-copy only Record No: H041777)
http://www.nafri.org.la/documents/newsletter/Journal/journal_17/section2.pdf
https://vlibrary.iwmi.org/pdf/H041777.pdf
https://vlibrary.iwmi.org/pdf/H041777.pdf
(0.83 MB)
12 Ribolzi, Olivier; Thiebaux, Jean-Pierre; Bourdon, Emmanuel; Briquet, J. P.; Chaplot, V.; Huon, S.; Marchand, P.; Mouche, E.; Pierret, Alain; Robain, H.; de Rouw, Anneke; Sengtahevanghoung, O.; Soulileuth, B.; Valentin, Christian. 2008. Effect of fallow regrowth on stream water yield in a headwater catchment under shifting cultivation in northern Lao PDR. Lao Journal of Agriculture and Forestry, Special issue no.17:52-71.
Water yield ; Runoff ; Water balance ; Shifting cultivation ; Stream flow ; Water uptake ; Groundwater depletion ; Land use ; Water table / Laos
(Location: IWMI HQ Call no: e-copy only Record No: H041774)
http://www.nafri.org.la/documents/newsletter/Journal/journal_17/section3.pdf
https://vlibrary.iwmi.org/pdf/H041774.pdf
https://vlibrary.iwmi.org/pdf/H041774.pdf
(0.53 MB)
13 Chaplot, V.; Podwojewski, P.; Phachomphon, K.; Valentin, Christian. 2009. Soil erosion impact on soil organic carbon spatial variability on steep tropical slopes. Soil Science Society of America Journal, 73(3):769-779.
Erosion ; Sloping land ; Shifting cultivation ; Soil organic matter ; Sampling ; Environmental effects ; Land management / Laos
(Location: IWMI HQ Call no: e-copy only Record No: H042066)
(1.19 MB)
14 Pierret, A.; de Rouw, A.; Chaplot, V.; Valentin, C.; Noble, Andrew; Suhardiman, Diana; Drechsel, Pay. 2011. Reshaping upland farming policies to support nature and livelihoods: lessons from soil erosion in Southeast Asia with emphasis on Lao PDR. [Report of the Management of Soil Erosion Consortium (MSEC) Project]. Marseille, France: Institut de Recherche pour le Developpment (IRD); Colombo, Sri Lanka: International Water Management Institute (IWMI). 40p. [doi: https://doi.org/10.5337/2011.213]
Upland areas ; Farming systems ; Shifting cultivation ; Agricultural policy ; Erosion ; Soil conservation ; Tillage ; Land use ; Site ; Monitoring ; Catchment areas ; Surface runoff ; Riparian zones ; Water management ; Vegetation ; Rain / Southeast Asia / Laos
(Location: IWMI HQ Call no: IWMI Record No: H044693)
(3.98 MB)
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