Conditions d'apparition du ruissellement dans les cultures annuelles de la région lémanique. Relation avec le fonctionnement des exploitations agricoles

Vansteelant, Jean-Yves; Trevisan, Diego Peruchi; Perron, Louis; Dorioz, Jean‐Marcel; Roybin, Daniel

doi:10.1051/agro:19970201

Cited by 16 publications

(11 citation statements)

References 2 publications

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“…The subsoil of the watershed consists of an impervious calcareous till which favours surface runoff and subsurface flow to the detriment of deep percolation [19]. Because of the gentle slopes and short length of the fields, runoff is generally not able to concentrate and erosion rarely leads to shallow gullies in the fields [71]. Urban impervious surfaces (roofs and roads) cover 9 ha.…”

Section: Study Areamentioning

confidence: 99%

“…However, erosive runoff is spatially limited and temporarily confined [23,30]. Other hydrological transfer pathways, non-erosive surface runoff [9,71] and subsurface flow or deep flow mobilise, in theory, only SP and, exceptionally, fine particles. SP always comes from exchanges and solubilisation phenomena which occur as soon as water is in contact with soil or suspended solids [51,54,61,73].…”

Section: Introductionmentioning

confidence: 99%

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Soluble phosphorus dynamics in an agricultural watershed

Jordan‐Meille

Dorioz²

2004

Agronomie

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-Both particulate phosphorus (PP) and soluble phosphorus (SP) contribute to the eutrophication of water bodies. This research focuses on the mechanisms and factors controlling SP exports at the watershed scale in a case study located in Southern France. Variability in the P concentrations and fluxes was analysed over a period of 6 years in a 302-ha rural watershed. During most of the hydrological periods, reservoirs and pathways for PP and SP seemed to be different both in time and space; differences were greatest during storm flows of the early wet season. Their high SP fluxes and concentrations were due to the P released from agricultural soils as shown by a P mass balance downstream/upstream. During these flushing periods, soluble forms of P follow a hydrochemical behaviour quite similar to solutes and are transferred in relationship to subsurface flows, as shown by a detailed monitoring of the transition from dry to wet season on an agricultural sub-watershed. soluble phosphorus / watershed / no point source / storm flows / losses Abbreviations: PP, particulate phosphorus; SP, soluble phosphorus; SRP, soluble reactive phosphorus; TSS, total suspended solids; TP, total phosphorus.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soluble phosphorus dynamics in an agricultural watershed

Jordan‐Meille

Dorioz²

2004

Agronomie

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“…This process is known to reduce the in®ltrative capacity of many soils in the temperate zone of Europe (Boin et al, 1988). Additionally, surface compaction by farm machinery during sowing and harvesting can further reduce in®ltration capacity (Vansteelant et al, 1997). When soil moisture levels are low during dry periods or when plant growth is initiated, surface cracking can occur to increase in®ltration capacity dramatically.…”

Section: Study Areamentioning

confidence: 99%

“…Low soil moisture levels and relatively undeveloped soil crusting results in a low potential for runo during the summer months. The seasonal variations in the potential for runo are shown in Figure 2C (Vansteelant et al, 1997). Land use in the Foron River watershed is diverse (Figure 1) with 50, 36, 10 and 4% of the watershed area being in natural forests, agriculture, urban use (villages and roads) and marshes, respectively (Dorioz and Orand, 1996).…”

Section: Study Areamentioning

confidence: 99%

Phosphorus storage, transport and export dynamics in the Foron River watershed

Dorioz¹,

Cassell

Orand³

et al. 1998

Hydrol. Process.

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Abstract:Phosphorus (P) export from the Foron River watershed was intensively monitored. Water was analysed for total P, soluble total P, soluble orthophosphate and suspended solids. Watershed soils and river sediments were sampled and the size fraction 50Á2 mm analysed for total P, water extractable P, bioavailable P, 1 minute exchangeable P and P ®xation capacity. Interstitial waters were analysed for soluble total P.Four hydrological conditions recurred, two during low river¯ows and two during increased¯ow. The ®rst occurs in dry weather with a constant or decreasing¯ow over at least seven days and when there is no surface runo. Exported phosphorus, predominately soluble and bioavailable, is from point sources. Phosphorus inputs exceed P export so P accumulates in the river. The second condition occurs when a small storm¯ow increases the average seven-day¯ow to exceed the preceding weekly average. Phosphorus export exceeds P inputs and originates from urban runo, point sources and release of P stored in the river. Exported P is largely particulate but highly bioavailable. The third condition is when substantial runo follows at least a seven-day period of constant or decreasing¯ow. Phosphorus export is from diuse urban runo. All the P stored is exported. Exported P is highly bioavailable. High concentrations and¯uxes of P export are often seen. The fourth condition happens when the soils are wet and increased¯ow is from both urban and agricultural runo. Phosphorus export from diuse agricultural runo predominates and is largely not bioavailable. Phosphorus concentrations are low but export¯uxes are high when¯ows are high. These hydrological conditions, when integrated with concepts of mass balance de®ne a phosphorus export typology comprising four regimes. These regimes explain total phosphorus (TP) storage, transport and export patterns, changes in P speciation and allow identi®cation of probable sources of TP in the Foron river watershed. #

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“…Uhlen, 1986;Oygarden, 1996;Hasholt et al, 1997) or in the Lake Leman area (e.g. Vansteelant et al, 1997).…”

Section: Introductionmentioning

confidence: 99%