Your search found 37 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 Unpublished report - IWMI/IRD. 6p.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 Clement, Floriane; Amezaga, J. M.; Orange, Didier; Toan, T. D.; Large, A. R. G.; Calder, I. R. 2006. Reforestation policies and upland allocation in northern Vietnam: an institutional approach for understanding farmer strategies and land use change. Paper presented at the International Symposium, Towards Sustainable Livelihoods and Ecosystems in Mountainous Regions, Chiang Mai, Thailand, 7-9 March 2006. 17p.
(Location: IWMI-HQ Call no: IWMI 333.75 G784 CLE Record No: H039286)
5 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)
6 Ha, P. Q.; Thiet, N. V.; Orange, Didier; Toan, T. D.; Pomel, S. 2006. Inventaire des techniques de culture dans les montagnes du Nord Vietnam. In French. [Assessment of Agricultural practices in the mountains of Northern Vietnam]. In Proceedings of the 14th Conference of ISCO, International Soil Conservation Organisation, Marrakech, Morocco, 14-19 May 2006. 8p.
(Location: IWMI-HQ Call no: IWMI 631.45 G784 HA Record No: H039291)
7 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)
8 Clement, Floriane; Amezaga, Jaime M.; Orange, Didier; Toan, Tran Duc. 2007. The impact of government policies on land use in northern Vietnam: an institutional approach for understanding farmer decisions. Colombo, Sri Lanka: International Water Management Institute (IWMI). 21p. (IWMI Research Report 112) [doi: https://doi.org/10.3910/2009.112]
Land use ; Public policy ; Reforestation ; Farmers ; Decision making ; Land management ; Shifting cultivation ; Villages / Vietnam
(Location: IWMI HQ Call no: IWMI 333.7313 G784 CLE Record No: H040277)
(881KB)
This report identifies the driving forces for reforestation in three villages of Northern Vietnam. Using an institutional analysis focused on the rules governing upland access and use, the authors assess the relative impact of state policies (reforestation programs and forestland allocation) on land use change. Findings show that the latter are indirectly responsible for reforestation, but not because of the incentives they provided. Instead, they disrupted the local rules governing annual crop cultivation and grazing activities leading to the end of annual cropping. Tree plantation was chosen by farmers as a last resort option. Lessons learned highlight the importance of local level studies and collective rules for land management.
9 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)
10 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.
11 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.
12 Orange, Didier; Phan, Ha Hai An; Lequeux, Brice; Henry des Tureaux, Thierry; Pham, Van Rinh; Toan, T. D. 2007. Charges de fond et suspensions transportees par les eaux d’ecoulement dans un petit bassin versant agricole sur pentes dans le Nord 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; Paper presented at Conference, Integrated Management of Waters and Soils: resources, infrastructures and risks in rural and urban areas, Hanoi, Vietnam, 6-9 November 2007. 6p.
(Location: IWMI HQ Call no: 333.91 G784 ORA Record No: H040807)
A small agricultural watershed on sloping lands (around 50 ha) in Northern Vietnam is equipped with 5 runoff measurement stations named weir. Each weir is representative of one vegetation cover (forest, fodder, cassava and old fallow). There is no relationship between bed load and rainfall amount due to a threshold process, but it is directly linked to the vegetation cover. In 2006, bed load losses are quite much important on the cassava crop (879 kg/ha/yr) than at the other weirs: 131 kg/ha/yr for old fallow, 83 kg/ha/yr for pluriannual plantation and 52 kg/ha/yr for forest. From some event measurements, the mean suspended load during the rising peak was a range 0.4-2.9 g/l with a SM peak around 3 to 8 g/l; the suspended load during the base flow was around 10-20 mg/l. It is impossible to predict the SM load with the discharge. For each weir, the best correlation is between SM load and Rindex emphasizing the duration and the amount of the rain event. The calculation of suspended load confirms the soil loss by suspended load is much more important than by bed load, even if the 95% of suspended load occurs during the peak events. On the whole watershed, the erosion amount by suspended load is 1.2 t/ha for 0.6 t/ha for bed load. More trees are in the basin, less is the suspended load; and at the opposite, the agricultural practices increase the amount of suspended load.
13 Orange, Didier; Bardouin, L.; Nguyen, D. P.; Loiseau, J. B.; Clement, Floriane; Jouquet, Pascal. 2007. Le concept de PES pour une gestion durable des eaux et des sols: application au developpement de l’elevage et au controle environnemental dans le Nord Vietnam. In French. 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; Paper presented at Conference, Integrated Management of Waters and Soils: resources, infrastructures and risks in rural and urban areas, Hanoi, Vietnam, 6-9 November 2007. 8p.
(Location: IWMI HQ Call no: 333.91 G784 ORA Record No: H040808)
In Northern Vietnam, the urgent environmental problems are soil erosion under annual crop on sloping lands leading to a drastic soil fertility decrease, inducing the risk to unfertilize the flatlands and to fill up the water reservoirs in the downstream part by sediment accumulation. Then a lack of disposable income for the purchase of inorganic fertilizers has resulted in farmers in Northern Vietnam resorting to the utilization of raw animal and human waste in order to fertilizer their cropping systems. This project is dealing at the District level in the Northward of Hoa Binh Province with the PES use (agro-ecological concept of Payment for Environmental Services) based on a new market opportunity for the farmers of Northern Vietnam to mobilise the integrated cattle husbandry enhancement and water management between uplands and lowlands. The purpose is to create a sustainable loop between fodder cropping on sloping lands, the cattle development under stables, the animal and human waste management, leading to human health and water quality protections, to the erosion sediment control for both a sustainable upland and lowland use. The proposed project offers a novel approach in that a holistic approach is introduced to achieve income generation from livestock manure management in mountainous environment of Southeast Asia in establishing a process of comprehensive assessment, of mutual learning between farmers from upper part and down part of the watershed through a hydrological modelling platform, and by the development of new agricultural technologies as biogas digester and vermicompost unit.
14 Luu, T. N. M.; Orange, Didier; Dang T. H.; Le Lan Anh; Garnier, J. 2007. Impact des activites anthropiques sur les flux de matieres en suspension et sur la qualite des eaux du fleuve Rouge a l’entree du delta. In French. [Impact of human activities on material flows suspended and the water quality of the Red River at the entrance of the delta]. In Do, S. Q. Integrated management of water and soil: resources, facilities and risk in rural and urban - proceedings of the 1st Scientific Meeting of the Inter-Network AUF, Hanoi, Vietnam, 6-9 November 2007 - Theme 2: Towards a sustainable management of rural and urban water systems. Montreal, Canada: Agence Universitaire de la Francophonie (AUF); Marseille, France: Institut de Recherche pour le Developpement (IRD); Hanoi, Vietnam: National University of Hanoi (UNH); Hanoi, Vietnam: Academy of Agricultural Sciences of Vietnam (SSAC); Hanoi, Vietnam: National Institute for Soils and Fertilizers (NISF). 6p.
Rivers ; Water quality ; Wastewater ; Pollution control / Vietnam / Red River / Hanoi / Day River / Nhue River
(Location: IWMI HQ Call no: 333.9162 G784 LUU Record No: H040809)
http://www.infotheque.info/fichiers/JSIR-AUF-Hanoi07/articles/AJSIR_2-p9_Luu.pdf
https://vlibrary.iwmi.org/pdf/H040809.pdf
https://vlibrary.iwmi.org/pdf/H040809.pdf
(173KB)
The water quality of the Red River is studied near Hanoi in comparison with the water quality of two small rivers, Day and Nhue, going to the Sea of China. The suspended load in the Red River is strongly linked to the rainy season, even near Hanoi in spite of the large demography: the suspended load is weak during the dry season, high during the rainy season (rising from 19 to 115 mg/l in 2005/2006). However our measurements prove that the suspended load increases within the Red River inside the Delta: we assume that it is due to the erosion of the river bank. In comparison with the Red River, the waters of the small streams are less loaded in suspended matter, due to the use of dams. At the opposite, the conductivity of the small streams are equal or highest than the Red River water. The measurements (concentrations in ammonium and phosphate) prove that the Red river could be used to clean the waste waters to drain the surface waters of the Delta to the Chinese sea.
15 Jouquet, P.; Podwojewski, P.; Bottinelli, N.; Mathieu, J.; Orange, Didier; Tran, D. T.; Valentin, Christian. 2007. Impact du changement d’usage des sols sur la biodiversite: consequences sur l’erosion des sols. 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; Paper presented at Conference, Integrated Management of Waters and Soils: Resources, infrastructures and risks in rural and urban areas, Hanoi, Vietnam, 6-9 November 2007. 6p.
Erosion ; Runoff ; Ecosystems ; Biodiversity ; Soil management / Vietnam / Dong Cao experimental watershed
(Location: IWMI HQ Call no: IWMI 631.45 G784 JOU Record No: H040810)
This study deals with the influence of land use change on earthworm diversity on the one hand and the consequences of these modifications on soil erosion on the other hand. This work has been realized in the Northern Vietnam, in the Dong Cao experimental watershed (average slope ~40%). Our work shows that endogeic earthworms are associated to agrosystems with low vegetation cover (or low litter content) while agrosystems with high vegetation cover are characterized by anecic earthworms that create casts on the soil surface. The quantity of soil accumulated on the soil surface by earthworms can be very important (10-20kg m-²). A simulation of water runoff associated to the annual measurement of soil erosion from 1m² plots shows that casts deposited on the soil surface lead to a better infiltration of water but do not increase soil erosion. This study highlights that other biological factors than the vegetation must be considered for a sustainable management of steep slope agro-ecosystems in the Northern Vietnam.
16 Phai, D. D.; Orange, Didier; Migraine, J. B.; Toan, Tran Duc; Vinh, N. C. 2007. Applying GIS-assisted modelling to predict soil erosion for a small agricultural watershed within sloping lands in Northern Vietnam. Paper presented at the 2nd International Conference on “Sustainable Sloping Lands and Watershed Management”, LuangPhrabang, Laos. 12-15 December 2006. pp. 212-228.
(Location: IWMI HQ Call no: IWMI 631.45 G784 PHA Record No: H040813)
GIS-assisted distributed modelling is particularly useful for supplying information to decision-makers regarding land-use, water management and environmental protection. This study deals with the prediction of soil losses by a simple distributed and GIS-assisted model within a small experimental agricultural watershed on sloping lands in northern Vietnam (<1 km2). The Predict and Localise Erosion and Runoff (PLER) model predicts the spatial and temporal distribution of soil erosion rates; thus it can be used to identify erosion hot spots in a watershed. The model has been built specifically to take into account steep slopes. It is a conceptual erosion model on a physical base. Indeed, the model imitates soil erosion as a dynamic process which includes three phases: i) detachment, ii) transport and iii) deposition. In this study the PLER model was used for two complete years, 2003 and 2004. The disparity for the soil erosion quantity between the experiment and the run model was 5.1% in 2003 and 4.9% in 2004, even though these two years had a very different annual amount of rain. Indeed, 40% of the rainfall events were of a strong intensity (>75 mm hr-1) in 2003 as apposed to only 4% in 2004. The amount of rainfall in 2003 and 2004 was 1,583 mm and 1,353 mm, respectively. The PLER model took into account this discrepancy in the rainfall characteristics between the two years. Between April to September, the disparity fluctuates between just 4.7%-5.3%. The maps drawn by the PLER model underline that the erosion process occurs mainly at the top of the landscape and highlights a different behaviour for detachability and soil erosion between the western and the eastern parts of the studied watershed.
17 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)
18 Clement, Floriane; Amezaga, J. M.; Orange, Didier; Calder, I. R. C.; Large, A. R. G. 2007. A multi-level approach to analyse the impact of forestland allocation on land management in Northern Vietnam. Poster presented at the RECOFTC Conference on “Poverty Reduction and Forests: Tenure, Market and Policy Reforms”, Bangkok, Thailand, 3-7 September 2007. 11p.
Land management ; Land use ; Land tenure ; Community forestry ; Households / Vietnam / Hoa Binh Province / So La / Thai Nguyen / Yen Bai
(Location: IWMI HQ Call no: IWMI 333.75 G784 CLE Record No: H040806)
Many Asian countries have recently devolved land use rights to households and communities. Often largely supported by donors and non-governmental international organizations, the success of these initiatives in improving livelihoods and forest or land management has been challenged by an increasing number of scholars for the last few years. Based on the case study of the Northern uplands of Vietnam, this paper investigates why forestland allocation has hardly achieved its intended objectives regarding land use and management. Results suggest that the gaps between stated intentions and outcomes result from inappropriate institutions and erroneous beliefs often linked with the economic and political context. We encourage the adoption of a similar multi-level framework focusing on actors’ incentives and beliefs to understand policy discrepancies and better guide future policies.
19 Orange, Didier; Toan, Tran Duc; Salgado, P.; Phuong, N. D.; Van Thiet, N.; Clement, Floriane; Binh, L. H. 2008. Different interests, common concerns and shared benefits. LEISA Magazine, 24(2):12-13.
Soil management ; Erosion ; Control methods ; Villages ; Land management ; Sloping land ; Decision making ; Farmer participation ; Farming systems ; Crop production ; Fodder ; Development projects / Vietnam / Hoa Binh Province
(Location: IWMI HQ Call no: IWMI 631.45 G784 ORA Record No: H041495)
http://www.leisa.info/index.php?url=getblob.php&o_id=209097&a_id=211&a_seq=0
https://vlibrary.iwmi.org/pdf/H041495.pdf
https://vlibrary.iwmi.org/pdf/H041495.pdf
Getting farmers to adopt new technologies to address soil erosion and fertility problems is not easy. In Vietnam, a multidisciplinary research project to improve soil management in traditional mountainous agricultural farming systems managed to attract farmers’ interest and stop soil erosion. This success stems from encouraging farmers, extensionists and researchers to jointly define and implement the project. Their different aims could be followed simultaneously: scientific results for researchers, better agricultural practice for extension workers, and economic success and free choice for farmers.
20 Podwojewski, P.; Orange, Didier; Jouquet, Pascal; Valentin, C.; Nguyen, V. T.; Janeau, J. L.; Toan, T. D. 2008. Land-use impacts on surface runoff and soil detachment within agricultural sloping lands in northern Vietnam. Catena, 74:109-118.
Surface runoff ; Land use ; Sloping land ; Cassava ; Eucalyptus ; Fodder ; Environmental degradation ; Catchment areas ; Soil properties ; Vegetation / Vietnam
(Location: IWMI HQ Call no: IWMI 631.4 G784 POD Record No: H041496)
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