Your search found 11 records
1 Valentin, Christian; Bricquet, Jean-Pierre; Chaplot, Vincent; de Rouw, Anneke; Janeau, Jean-Louis; Lestrelin, Guillaume; Orange, Didier; Podwojewski, Pascal; Thiébaux, Jean-Pierre; Silvera, Norbert. 2003. Management of soil erosion consortium contribution of IRD, Lao PDR, Thailand, Vietnam – Mid-year report, January-June 2003. Unpublished report - IWMI/IRD. 6p.
(Location: IWMI-HQ Call no: IWMI 631.45 G708 VAL Record No: H036001)
2 Toan, T. D.; Orange, Didier; Podwojewski, Pascal; Phai, D. D.; Phien, T.; Maugin, J.; Rinh, P. V. 2003. Soil erosion and land use in the Dong Cao Catchment in Northern Vietnam. 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.165-179.
(Location: IWMI-HQ Call no: IWMI 631.45 G570 MAG Record No: H036272)
(0.88 MB)
3 Orange, Didier; Podwojewski, Pascal; Toan, T. D.; Phai, D. D.; Bayer, A.; Phuong, N. D.; Thiet, N. V.; Rinh, P. V.; Koikas, J. 2004. Soil erosion management at the watershed level for sustainable agriculture and forestry in Vietnam. In Annual report 2003. IWMI Southeast Asia Regional Office, Bangkok, Thailand. pp.153-185.
Erosion ; Rain ; Water table ; Soil properties ; Soil management ; Land use ; Watershed management ; Sustainable agriculture ; Forestry / Vietnam
(Location: IWMI-HQ Call no: IWMI 631.4 G570 MAG Record No: H037209)
4 Toan, T. D.; Orange, Didier; Podwojewski, Pascal; Phai, D. D.; Phien, T. 2003. Erosion control within a cultivated sloping land in North Vietnam. Paper presented at China Symposium 2 – Soil quality and evolution mechanism and sustainable use of soil resources, ISSAS, Yingtan, Jiangxi Province, China, September 23-28, 2003. 16p.
(Location: IWMI-HQ Call no: IWMI 631.45 G784 TOA Record No: H039290)
5 Jouquet, P.; Bernard-Reversat, F.; Bottinelli, N.; Orange, Didier; Rouland-Lefevre, C.; Toan, Tran Duc; Podwojewski, Pascal. 2006. Influence of change in land use and earthworm activities on carbon and nitrogen dynamics in a steepland ecosystem in Northern Vietnam. Biology and Fertility of Soils, 44(1): 69-77.
Soil management ; Agroecosystems ; Erosion ; Soil properties ; Earthworms ; Land use ; Soil fertility ; Nitrogen / Vietnam
(Location: IWMI-HQ Call no: IWMI 631.4 G784 JOU Record No: H039293)
6 Orange, Didier; Podwojewski, Pascal; Toan, Tran Duc; Van Rinh, Pham; Phai, Do Duy; Phuong, Nguten Duy. 2007. Impact of land-use on bed load transported by rivers in the Dong Cao Watershed, North Vietnam. Water Figures Asia: news of IWMI’s work in Asia, 1: 4-5.
(Location: IWMI HQ Call no: IWMI 630.7 G000 IWM Record No: H040803)
7 Jouquet, P.; Bottinelli, N.; Mathieu, J.; Orange, Didier; Podwojewski, Pascal; Henry des Tureaux, Thierry; Toan, Tran Duc. 2007. Impact of land-use change on earthworm diversity and activity: the consequences for soil fertility and soil erosion. In 2nd International Conference on Sustainable Sloping Lands and Watershed Management, LuangPhrabang, Laos, 12-15 December 2006. pp.127-138.
Land use ; Earthworms ; Soil fertility ; Soil properties ; Erosion ; Runoff ; Infiltration ; Cassava ; Farming systems ; Eucalyptus / Vietnam / Dong Cao Watershed
(Location: IWMI HQ Call no: IWMI 631.4 G784 JOU Record No: H040804)
http://www.nafri.org.la/documents/SSLWM/SSLWMpapers/chapter2/ch2_02_jouguet.pdf
https://vlibrary.iwmi.org/pdf/H040804.pdf
https://vlibrary.iwmi.org/pdf/H040804.pdf
Earthworms are considered useful indicators for monitoring different farming practices, landscape structures and transformations because they respond quickly to land-use change. Many articles have been written on the effects of soil macrofauna (termites and earthworms) on soil properties and the functioning of ecosystems. These soil animals are usually considered to have a positive influence on soil organic matter decomposition and nutrient cycling. They increase the concentration of nutrients in their biogenic structures (casts, sheetings, nests, galleries etc.) and promote the growth and diversity of plants. However, there is a lack of data concerning their impact on tropical ecosystems with steep slopes. This study is part of the Management of Soil Erosion Consortium (MSEC) project, which examines the effects of land-use changes on soil erosion on a southeast Asian regional scale. The aim of the study was to evaluate the recovery potential of earthworms and their effects on soil conservation in areas where cassava crops were replaced by four different types of vegetation cover. It was conducted in an experimental watershed in Hoa Binh province, a mountainous area of northern Vietnam. Results showed that landuse change affects earthworm diversity and that this has significant consequences in terms of soil fertility, water infiltration and soil erosion. In plots planted with eucalyptus, large amounts of plant litter and probably higher soil moisture levels favour Pheretima leucocirca activity. These worms produce surface casts, which then became free aggregates, and galleries which are sometimes open at the surface. Casts, galleries and aggregates increase water infiltration and thus reduced water runoff and soil erosion. Cassava, fallow and fodder, however, favour Metaphire californica worms, which do not make casts. A soil crust is formed, which leads to a decrease in water infiltration and increased soil erosion. The data clearly shows that biological parameters such as earthworm diversity and activity must not be neglected in studies of the determinants of soil erosion after land-use change. Upland land-use systems with vegetation that produces lots of ground litter may help encourage beneficial worm species (such as Ph. leucocirca) and thus help reduce soil erosion and accelerate restoration of degraded land.
8 Phan, Ha Hai An; Orange, Didier; Huon, S.; Henry des Tureaux, Thierry; Pham Van Rinh; Tran, Thi My Linh; Podwojewski Pascal. 2007. Evolution des teneurs en carbone organique et azote dans les matieres en suspension des eaux de surface d’un petit bassin versant agricole sur pente dans le Nord Vietnam. In French. [Organic carbon and nitrogen contents in the suspended matters of surface waters within a small agricultural watershed on sloping lands in Northern Vietnam]. Gestion integree des eaux et des sols : ressources, amenagements et risques en milieux ruraux et urbains, Editions AUF et IRD, Hanoi, Actes des Premieres Journees Scientifiques Inter-Reseaux de l’AUF, Hanoi, 6-9 novembre 2007. 6p.
(Location: IWMI HQ Record No: H040805)
This study deals with the organic carbon concentration and nitrogen concentration inside the suspended particulate matter transported by the small rivers with a watershed area below 10 ha and totally enclosed on sloping lands. The scientific purpose is to determine if these two components of soil losses from erosion process on topsoil could be used as tracers for the organic matter to point out the surface water pathway during one peak flow. The fluctuations in POC content, in C/N rate and in ?13C isotopic rate are no linked with the vegetation species on the sloping land during the process of surface runoff until the runoff collect in the small stream. However their absolute values are characteristic of each kind of vegetation cover. Then our results allow assuming that the mix of chemical tracers such as pH, water conductivity, organic carbon and nitrogen content in sediment with the associate measurements of ?13C isotopic component can be used to analyze the surface water pathway within a small sloping watershed during one peak flow. The next step will be the calculation of hydrological components of the hydrogram in relationship with the water pathway by the mixed equation use applied to the ?13C isotopic component of the organic matter form the sediments and from their corresponding soils.
9 Jouquet, P.; Podwojewski, Pascal; Bottinelli, N.; Mathieu, J.; Martinez, M. R.; Orange, Didier; Toan, Tran Duc; Valentin, Christian. 2008. Above-ground earthworm casts affect water runoff and soil erosion in northern Vietnam. Catena, 74(1): 13-21.
(Location: IWMI HQ Call no: IWMI 631.45 G784 PAS Record No: H040814)
10 Jouquet, Pascal; Bottinelli, N.; Podwojewski, Pascal; Hallaire, V. 2008. Chemical and physical properties of earthworm casts as compared to bulk soil under a range of different land-use systems in Vietnam. Geoderma, 146:231-238.
Land use ; Soil properties ; Soil pore system ; Soil ; Sampling ; Soil analysis ; Erosion ; Earthworms / Vietnam
Call no: e-copy only Record No: H041501)
11 Podwojewski, Pascal; Janeau, Jean L. 2005. Short-term effects of agricultural practices on the soil structure and hydrodynamic in a deep tilled hardened sandy-silty volcanic–ash soil (cangahua) in Ecuador. In International Union of Soil Sciences (IUSS); Institut de Recherche pour le Developpement (IRD); Thailand. Land Development Department (LDD); International Water Management Institute (IWMI); FAO. Regional Office for Asia and the Pacific (FAO RAP); Khon Kaen University. Faculty of Agriculture. Management of tropical sandy soils for sustainable agriculture: a holistic approach for sustainable development of problem soils in the tropics. Proceedings of the First Symposium on Management of Tropical Sandy Soils for Sustainable Ariculture, Khon Kaen, Thailand, 27 November – 2 December 2005. Bangkok, Thailand: FAO Regional Office for Asia and the Pacific (FAO RAP). pp.215-222.
Agricultural practices ; Volcanic soils ; Soil structure ; Sandy soils ; Silty soils ; Clay soils ; Soil organic matter ; Carbon ; Hydrodynamics ; Simulated rainfall ; Erosion / Ecuador
(Location: IWMI HQ Call no: 630 G000 INT Record No: H047328)
(0.39 MB) (16.9 MB)
In the Ecuadorian Cordillera, the hardened volcanic ashes (cangahuas) account for 15% of the cultivated area. The soil resulting from the fragmentation of these materials, generally by heavy machinery, shows an apparent stable millimetric structure. However, this new structure is highly susceptible to disintegration under rain, because it contains no organic matter and has a sandy-silt composition with very little mineralogical clay, and the material itself is readily eroded. In consequence we studied the evolution of soil aggregate stability in two factorial experiments during five cultivation cycles with two kinds of soil preparation and five fertilization treatments. Rainfall simulation was implemented before and after three cycles of cultivation to asses the soils structure evolution and its erodibility. The cultivated plots had flat surfaces and the rainfall simulation tests were conducted after the harvest on bare surfaces. Surface soil crusting occurred rapidly within the cultivated plots when compared to the recent tilled cangahua. Runoff and soil loss were generally higher on plots with lower structural stability, generally with higher clay content. The aggregate stability was not influenced by either kind of soil preparation, nor by large additions of manure (80 t ha-1) or green fertilizers (10 t ha-1), nor by growing a perennial grass. The variation in the aggregate stability seemed to depend on the components inherited from the original volcanic material: in the plots with larger clay content, and with swelling clay minerals, the aggregates were less stable than those composed of isometric fine silt particles. In agreement with the structural stability measured in a laboratory, organic matter inputs increase the soil porosity but had no effect on the structural stability and resistance to crusting, and thus to runoff and to erosion. For these soils, no tillage and a permanent soil cover (pasture) would be the best agricultural option.
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