A long-term view of nutrient transfers through the Seine river continuum

Billen, Gilles; Garnier, Josette; Némery, Julien; Sébilo, Mathieu; Sferratore, Agata; Barles, Sabine; Benoit, Paul; Benoît, Marc

doi:10.1016/j.scitotenv.2006.12.005

Cited by 164 publications

(93 citation statements)

References 52 publications

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“…Conversely, the modern agrarian system now dominating the Parisian basin is extremely demanding in external resources such as fuel, chemical fertilizers and pesticides, and generates environmental dysfunctions in the form of water and, to a lesser extent, air pollution (ref. in Billen et al 2007b). The increasing pressure placed on the rural territory for environmental resources other than space itself is not taken into account in our spatial assessment of the impact of Paris food requirements as defined here.…”

Section: Discussionmentioning

confidence: 99%

The food-print of Paris: long-term reconstruction of the nitrogen flows imported into the city from its rural hinterland

et al. 2008

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Between the tenth and twentieth century the population of Paris city increased from a few thousand to near 10 million inhabitants. In response to the growing urban demand during this period, the agrarian systems of the surrounding rural areas tremendously increased their potential for commercial export of agricultural products, made possible by a surplus of agricultural production over local consumption by humans and livestock in these areas. Expressed in terms of nitrogen, the potential for export increased from about 60 kg N/km 2

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Section: Discussionmentioning

confidence: 99%

The food-print of Paris: long-term reconstruction of the nitrogen flows imported into the city from its rural hinterland

et al. 2008

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“…Most examination of regional eutrophication, and much of the research on the dynamics of P pools in agricultural soils, has focused on the temperate zone [1,15,17,18]. But input-intensive agriculture is now expanding most rapidly in tropical regions [19,20], where the fate of fertilizer P both on and off the farm is less well understood.…”

Section: Introductionmentioning

confidence: 99%

The fate of phosphorus fertilizer in Amazon soya bean fields

Riskin

Porder

Neill

et al. 2013

Phil. Trans. R. Soc. B

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Fertilizer-intensive soya bean agriculture has recently expanded in southeastern Amazonia, and whereas intensive fertilizer use in the temperate zone has led to widespread eutrophication of freshwater ecosystems, the effects in tropical systems are less well understood. We examined the fate of fertilizer phosphorus (P) by comparing P forms and budgets across a chronosequence of soya bean fields (converted to soya beans between 2003 and 2008) and forests on an 800 km 2 soya bean farm in Mato Grosso, Brazil. Soya bean fields were fertilized with 50 kg P ha −1 yr −1 (30 kg P ha −1 yr −1 above what is removed in crops). We used modified Hedley fractionation to quantify soil P pools and found increases in less-plant-available inorganic pools and decreases in organic pools in agricultural soils compared with forest. Fertilizer P did not move below 20 cm. Measurements of P sorption capacity suggest that while fertilizer inputs quench close to half of the sorption capacity of fast-reacting pools, most added P is bound in more slowly reacting pools. Our data suggest that this agricultural system currently has a low risk of P losses to waterways and that long time-scales are required to reach critical soil thresholds that would allow continued high yields with reduced fertilizer inputs.

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“…Hence inorganic P is described by two state variables: the total inorganic P (PIT) and PO 4 3− . At each time step, the model considers that PO 4 3− is in rapid adsorption-desorption equilibrium with inorganic particulate phosphorus (PIP), according to an hyperbolic relationship proposed by Billen et al (2007). Benthic organic matter degradation and nutrient recycling are calculated using the algorithms developed by Thouvenot et al (2007).…”

Section: Biogeochemical Model Rive-miromentioning

confidence: 99%

Modelling phytoplankton succession and nutrient transfer along the Scheldt estuary (Belgium, The Netherlands)

Gypens

Delhez

Vanhoutte-Brunier

et al. 2013

Journal of Marine Systems

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a b s t r a c t a r t i c l e i n f oThe freshwater (RIVE) and the marine (MIRO) biogeochemical models were coupled to a 1D hydrosedimentary model to describe contemporary phytoplankton succession and nutrient transfers in the macrotidal Scheldt estuary (BE/NL) affected by anthropogenic nutrient loads. The 1D-RIVE-MIRO model simulations are performed between Ghent and Vlissingen and the longitudinal estuarine profiles are validated by visual and statistical comparison with physico-chemical and phytoplankton observations available for the year 2006. Results show the occurrence of two distinct spatial phytoplankton blooms in the upper and lower estuary, suggesting that neither the freshwater nor the marine phytoplankton gets over the maximum turbidity zone (MTZ) at the saline transition. Sensitivity tests performed to understand how changing conditions (salinity, turbidity and nutrients) along the estuary are controlling this bimodal spatial phytoplankton distribution identify salinity and light availability as the key drivers while the grazing pressure and nutrient limitation play a negligible role. Additional tests with varying salinity-resistant (euryhaline) species in the freshwater assemblage conclude that the presence (or absence) of euryhalines determines the magnitude and the spreading of freshwater and marine phytoplankton blooms in the estuary. Annual nutrient budgets estimated from 1D-RIVE-MIRO simulations show that biological activities have a negligible impact on nutrient export but modify the speciation of nutrients exported to the coastal zone towards inorganic forms, thus directly available to phytoplankton. The implementation of nutrient reduction options (upgrading of waste water treatment plants, conversion to organic farming) on the Scheldt watershed influences the whole estuary and affects both the magnitude and the speciation of nutrients exported to the coastal zone with expected impact on coastal phytoplankton dynamic.

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A long-term view of nutrient transfers through the Seine river continuum

Cited by 164 publications

References 52 publications

The food-print of Paris: long-term reconstruction of the nitrogen flows imported into the city from its rural hinterland

The food-print of Paris: long-term reconstruction of the nitrogen flows imported into the city from its rural hinterland

The fate of phosphorus fertilizer in Amazon soya bean fields

Modelling phytoplankton succession and nutrient transfer along the Scheldt estuary (Belgium, The Netherlands)

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