Your search found 7 records
1 Sengtaheuanghoung, O.; Valentin, Christian; Ribolzi, Olivier; de Rouw, Anneke; Thiebaux, Jean-Pierre. 2007. The impact of rapid land use changes upon sediment yields from agricultural catchments in northern Lao PDR. Actes des JSIRAUF, Hanoi, Vietnam, 6-9 novembre 2007. 5p.
Catchment areas ; Sedimentation ; Land use ; Cropping systems ; Shifting cultivation ; Rain ; Runoff / Laos / Houay Pano catchment
(Location: IWMI HQ Call no: IWMI 333.91 G708 SEN Record No: H040865)
To provide data that are lacking at the catchment scale, outflow and sediment yield have Been monitored from 8 small (0.5-64 ha) rural catchments since 2001 in northern Lao PDR. Soil conservation strategies have been developed and tested on three of these catchments. Results clearly show that sediment yields can be reduced from 5-11 Mg ha-1 yr-1 under the current slash and burn system to nearly nil when appropriate practices are selected. These include improved fallow systems based on legumes. These innovative practices rehabilitate degraded land and enhance water quality.
2 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)
3 Sengtaheuanghoung, O.; Valentin, Christian; Ribolzi, Olivier; de Rouw, Anneke; Thiebaux, Jean-Pierre. 2007. Enhancing water quality through better land management of degraded upland regions in northern Laos. In Gebbie, L.; Glendinning, A.; Lefroy-Braun, R.; Victor, M. (Eds.). Proceedings of the International Conference on Sustainable Sloping Lands and Watershed Management: Linking Research to Strengthen upland Policies and Practices, National Agriculture and Forestry Research Institute of Lao PDR (NAFRI), Vientiane, Lao PDR, 2007. Vientiane, LAO PDR: National Agriculture and Forestry Research Institute of Lao PDR (NAFRI) pp.47-58.
Land management ; Water quality ; Erosion ; Sedimentation ; Rainfall-runoff relationships ; Soil conservation ; Shifting cultivation ; Catchment areas / Laos
(Location: IWMI HQ Call no: IWMI 333.91 708 SEN Record No: H041510)
http://www.nafri.org.la/documents/SSLWM/SSLWMpapers/chapter1/ch1_04_oloth.pdf
https://vlibrary.iwmi.org/pdf/H041510.pdf
https://vlibrary.iwmi.org/pdf/H041510.pdf
4 de Rouw, Anneke; Douillet, M.; Tjiantahosong, H.; Ribolzi, Olivier; Thiebaux, Jean-Pierre. 2007. Dispersal of weed seeds by erosion and flow processes in upland fields. In Gebbie, L.; Glendinning, A.; Lefroy-Braun, R.; Victor, M. (Eds.). Proceedings of the International Conference on Sustainable Sloping Lands and Watershed Management: Linking Research to Strengthen upland Policies and Practices, National Agriculture and Forestry Research Institute of Lao PDR (NAFRI), Vientiane, Lao PDR, 2007. Vientiane, LAO PDR: National Agriculture and Forestry Research Institute of Lao PDR (NAFRI) pp.156-166.
Erosion ; Seeds ; Weeds ; Grasses ; Rice ; Shifting cultivation ; Catchment areas / Laos / Houay Pano Catchment
(Location: IWMI HQ Call no: IWMI 333.91 708 ROW Record No: H041519)
http://www.nafri.org.la/documents/SSLWM/SSLWMpapers/chapter2/ch2_04_derouw.pdf
https://vlibrary.iwmi.org/pdf/H041519.pdf
https://vlibrary.iwmi.org/pdf/H041519.pdf
5 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)
6 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)
7 Rajot, J. L.; Karambiri, H.; Ribolzi, Olivier; Planchon, O.; Thiebaux, Jean-Pierre. 2009. Interaction entre erosions hydrique et eolienne sur sols sableux patures au Sahel: cas du bassin-versant de Katchari au nord du Burkina Faso. In French. [Wind and water erosions of pastured sandy soils in the Sahel: a case study in northern Burkina Faso]. Secheresse, 20(1):131-138.
(Location: IWMI HQ Call no: e-copy only Record No: H042653)
http://www.john-libbey-eurotext.fr/en/revues/agro_biotech/sec/e-docs/00/04/49/D2/telecharger.phtml?code_langue=fr&format=application/pdf&titre=Version PDF
https://vlibrary.iwmi.org/pdf/H042653.pdf
https://vlibrary.iwmi.org/pdf/H042653.pdf
(0.24 MB)
In the Sahel, sandy soils are widespread and support not only most of the pearl millet production, the major staple crop in the region, but also grass production for livestock. Parent sediments of these soils have an aeolian origin and are hence prone to wind erosion. Still, their clay content, even though very low, allows physical crust formation during rainfall leading to runoff and water erosion. Squall lines, major rainfall events of the rainy season, are usually preceded by intense wind. Wind and water erosions are therefore closely associated in both time and space, but they are rarely studied simultaneously. Erosion measurements were performed for two years (2001, 2002) on a small catchment of grazing land (1,4 ha) at Katchari, Burkina Faso, a location typical of the Sahel area with under 500 mm annual rainfall. Wind erosion occurs at the onset of the rainy season, from May to 15th of July, when soil cover is the lowest and before the growth of vegetation. On this non-cultivated area, the same dynamic unfolds as that recorded in millet fields in other sahelian studies. Water erosion occurs throughout the rainy season, but certain intense events produce most of the total annual erosion. Wind causes the largest sediment fluxes leading to both erosion (up to 20 Mg/ha per year) and deposition (up to 30 Mg/ha per year) depending on the area in the catchment. Water erosion is one order of magnitude lower than wind erosion and is more intense where wind erosion is highest. Hence, the same area is eroded by both wind and water. Conversely, areas where aeolian deposition occurs are less affected by water erosion and correspond to fertile islands where vegetation grows. From this study, it comes out that there is on the whole no land degradation at the catchment scale, but an intense aeolian and water dynamic leading to substantial spatial variability typical of sahelian landscapes.
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