Sediment induced soil spatial variation in paddy fields of Northwest Vietnam

Schmitter, Petra; Dercon, Gerd; Hilger, Thomas; Ha, Thi; Thanh, Nguyen Huu; Lâm, Nguyễn Thanh; Vien, Tran Duc; Cadisch, Georg

doi:10.1016/j.geoderma.2009.12.014

Cited by 47 publications

(43 citation statements)

References 31 publications

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“…reported a yearly run-off of 2.5 % of precipitation for the period May 2009 to April 2010, and an average transport of 6.6 kg (minimum 2.1 kg to maximum 13.2 kg) eroded soil per m 2 per year for upland maize fields, with especially high erosion occurring in the spring time when there was very little soil cover and heavy rains occurred. For rice paddies in the research area, Schmitter et al (2010Schmitter et al ( , 2011 reported changes in soil fertility related to the distance of the water inflow in relation to paddy rice cascades, and explained these differences in soil fertility and corresponding grain yields as being due to sedimentation of the eroded particles from the uplands. While eroded particles have a yield increasing effect in rice paddies, Steinbronn (2009) reported that these particles also inhibit primary production in ponds by impairing the penetration of sunlight, even though in her study both the particles and the water that carried them brought in nutrients and organic matter.…”

Section: Implementation Of the Modified Pond Management Systemmentioning

confidence: 99%

Improved Sustainable Aquaculture Systems for Small-Scale Farmers in Northern Vietnam

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Steinbronn

Mayrhofer

et al. 2012

Sustainable Land Use and Rural Development in Southeast Asia: Innovations and Policies for Mountainous Areas

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Section: Implementation Of the Modified Pond Management Systemmentioning

confidence: 99%

Improved Sustainable Aquaculture Systems for Small-Scale Farmers in Northern Vietnam

Pucher

Steinbronn

Mayrhofer

et al. 2012

Sustainable Land Use and Rural Development in Southeast Asia: Innovations and Policies for Mountainous Areas

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“…Furthermore, the effect of flooding on rice production was investigated by measuring soil fertility and rice performance on fields situated close to the river and compared with non-flooded fields. A more detailed overview of methods used can be found in Schmitter et al (2010). The microeconomic consequences of the flood were assessed using a dataset constituted from a survey of 300 randomly selected households throughout Yen Chau district and an additional sample of 36 households situated in Chieng Khoi.…”

Section: Interdisciplinary Approach To Data Collection and Analysismentioning

confidence: 99%

“…As Schmitter et al (2010) have shown that the flooding had both short and long-term impacts on the agro-environment. The rice yields of the flooded fields were 5% lower in Nat Hazards (2012) 62:221-241 233 the summer season compared to the yields obtained in the same fields during the spring season earlier that year when no flooding occurred.…”

Section: Facts and Perceptions Of Agro-environmental Impactsmentioning

confidence: 99%

Why do people not learn from flood disasters? Evidence from Vietnam’s northwestern mountains

et al. 2011

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This article explores how the causes and impacts of a flood event as perceived by local people shape immediate responses and future mitigation efforts in mountainous northwest Vietnam. Local flood perception is contrasted with scientific perspectives to determine whether a singular flood event will trigger adjustments in mitigation strategies in an otherwise rarely flood-affected area. We present findings from interdisciplinary research drawing on both socioeconomic and biophysical data. Evidence suggests that individual farmers' willingness to engage in flood mitigation is curbed by the common perception that flooding is caused by the interplay of a bundle of external factors, with climatic factors and water management failures being the most prominent ones. Most farmers did not link the severity of flooding to existing land use systems, thus underlining the lack of a sense of personal responsibility among farmers for flood mitigation measures. We conclude that local governments cannot depend on there being a sufficient degree of intrinsic motivation among farmers to make them implement soil conservation techniques to mitigate future flooding. Policy makers will need to design measures to raise farmers' awareness of the complex interplay between land use and hydrology and to enhance collective action in soil 123Nat Hazards (2012) 62:221-241 DOI 10.1007 conservation by providing appropriate incentives and implementing coherent long-term strategies.

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“…In China, Tang et al (2008) reported an averaged input of 0.02 Mg total N ha -1 year -1 in paddy fields from irrigation water in an intensively cultivated watershed. While small and moderate nutrient-rich sediment deposition on downstream located farmland such as paddy fields might be beneficial, large nutrient-poor sediment delivery could decrease the original soil fertility (Cassel et al 2000;Mingzhou et al 2007;Schmitter et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Redistribution of carbon and nitrogen through irrigation in intensively cultivated tropical mountainous watersheds

et al. 2011

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This study aimed at tracing and quantifying organic carbon and total nitrogen fluxes related to suspended material in irrigation water in the uplands of northwest Vietnam. In the study area, a reservoir acts as a sink for sediments from the surrounding mountains, feeding irrigation channels to irrigate lowland paddy systems. A flow separation identified the flow components of overland flow, water release from the reservoir to the irrigation channel, direct precipitation into the channel, irrigation discharge to paddy fields and discharge leaving the sub-watershed. A mixed effects model was used to assess the C and N loads of each flow component. Irrigation water had an average baseline concentration of 29 ± 4.4 mg l -1 inorganic C, 4.7 ± 1.2 mg l -1 organic C and 3.9 ± 1.6 mg l -1 total N. Once soils were rewetted and overland flow was induced, organic C and total N concentrations changed rapidly due to increasing sediment loads in the irrigation water. Summarizing all monitored events, overland flow was estimated to convey about 63 kg organic C ha -1 and 8.5 kg N ha -1 from surrounding upland fields to the irrigation channel. The drainage of various nonpoint sources towards the irrigation channel was supported by the variation of the estimated organic C/total N ratios of the overland flow which fluctuated between 2 and 7. Nevertheless, the majority of the nutrient loads (up to 93-99%) were derived from the reservoir, which served as a sediment-buffer trap. Due to the overall high nutrient and sediment content of the reservoir water used for irrigation, a significant proportion of nutrients was continuously reallocated to the paddy fields in the lowland throughout the rice cropping season. The cumulative amount of organic C and total N load entering paddies with the irrigation water between May and September was estimated at 0.8 and 0.7 Mg ha -1 , respectively. Therefore deposition of C and N through irrigation is an important contributor in maintaining soil fertility, and a process to be taken into account in the soil fertility management in these paddy rice systems.

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Sediment induced soil spatial variation in paddy fields of Northwest Vietnam

Cited by 47 publications

References 31 publications

Improved Sustainable Aquaculture Systems for Small-Scale Farmers in Northern Vietnam

Improved Sustainable Aquaculture Systems for Small-Scale Farmers in Northern Vietnam

Why do people not learn from flood disasters? Evidence from Vietnam’s northwestern mountains

Redistribution of carbon and nitrogen through irrigation in intensively cultivated tropical mountainous watersheds

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