Budget of N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O emissions at the watershed scale: role of land cover and topography (the Orgeval basin, France)

Vilain, Guillaume; Garnier, Josette; Passy, Paul; Silvestre, Marie; Billen, Gilles

doi:10.5194/bg-9-1085-2012

Cited by 15 publications

(7 citation statements)

References 60 publications

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“…The importance of landscape position on N 2 O emissions has been documented by other studies [ Pennock et al , ; Corre et al , ], which found greater N 2 O emissions in the valley bottom than in the ridgetop or midslope positions. Differences in moisture content along the slope usually explain the N 2 O flux variability [ Vilain et al ., , ; Negassa et al ., ], with higher fluxes in the lower positions closely correlated with the higher WFPS. However, our approach involved standardized soil moisture levels across the treatments, and we still observed position‐driven variations of N 2 O emission with lower N 2 O emitted at the steeply sloping plots when compared with flat plots (ridgetop and valley bottom plots).…”

Section: Discussionmentioning

confidence: 98%

Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya

et al. 2017

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Quantifying and understanding the small‐scale variability of nitrous oxide (N2O) and carbon dioxide (CO2) emission are essential for reporting accurate ecosystem greenhouse gas budgets. The objective of this study was to evaluate the spatial pattern of soil CO2 and N2O emissions and their relation to topography in a tropical montane forest. We measured fluxes of N2O and CO2 from 810 sampling locations across valley bottom, midslope, and ridgetop positions under controlled laboratory conditions. We further calculated the minimum number of samples necessary to provide best estimates of soil N2O and CO2 fluxes at the plot level. Topography exhibited a major influence on N2O emissions, with soils at midslope position emitting significantly less than at ridgetops and valley bottoms, but no consistent effect of topography on soil CO2 emissions was found. The high spatial variation of N2O and CO2 fluxes was further increased by changes in vegetation and soil properties resulting from human disturbance associated with charcoal production. Soil N2O and CO2 fluxes showed no spatial pattern at the plot level, with “hot spots” strongly contributing to the total emissions (10% of the soil cores represented 73 and 50% of the total N2O and CO2 emissions, respectively). Thus, a large number of samples are needed to obtain robust estimates of N2O and CO2 fluxes. Our results highlight the complex biogeochemical cycling in tropical montane forests, and the need to carefully address it in research experiments to robustly estimate soil CO2 and N2O fluxes at the ecosystem scale.

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Section: Discussionmentioning

confidence: 98%

Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya

et al. 2017

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“…For a detailed description of the Orgeval river basin, please refer to Vilain et al . (). Observed hourly precipitation and discharge data from 1970 to 2012 allowed the construction of IDF curves for different return periods ( T r ) and the determination of yearly discharge maxima.…”

Section: Description Of Case Studiesmentioning

confidence: 97%

Design hydrograph estimation in small and fully ungauged basins: a preliminary assessment of the EBA4SUB framework

Petroselli

Grimaldi

2015

J Flood Risk Management

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Design hydrograph estimation in small and ungauged basins is still a critical issue in hydrological studies. Although a great effort has been devoted to improving the knowledge on this topic in the last 10 years, some unresolved problems still limit the practitioners. Indeed, in small and ungauged watersheds located in areas where regionalisation analyses are not available, hydrologists still typically apply the rational formula. In a recent contribution, we proposed an event‐based framework illustrating its potential benefits over the widely used rational formula and underlining its tendency to be less sensitive and less subjective. In the present contribution, we present a preliminary assessment of the proposed framework, analysing its application to five watersheds for which enough observed data are available to provide an evaluation of the model's performance. Although the results confirm that the design hydrograph estimation in small and ungauged basins is affected by relevant errors and uncertainty, they also show that the proposed framework is promising for practical hydrology.

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“…1). In addition, the Orgeval River in an agricultural experimental catchment (Vilain et al 2012) was also monitored during year 2011 (n=9) (Fig. 1).…”

Section: Sampling Sites / Campaignsmentioning

confidence: 99%

Alkylphenolic compounds and bisphenol A contamination within a heavily urbanized area: case study of Paris

Cladière

Gaspéri

Lorgeoux

et al. 2012

Environ Sci Pollut Res

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This study aims at evaluating the influence of a heavily urbanized area such as the Paris city area on receiving water contamination by bisphenol A (BPA) and alkylphenol ethoxylate by-product (APE). Firstly, concentrations in urban sources were investigated. Therefore, in addition to wastewater treatment plant effluents commonly studied, wet-weather urban sources including combined sewer overflows, urban runoff and total atmospheric fallout were considered. The first results highlight significant contaminations of all urban sources (from few ng/L in atmospheric fallout to several µg/L in other sources) with clearly distinguishable distribution patterns.Secondly, the concentration changes along the Seine River from upstream to downstream of Paris conurbation were investigated. While concentrations of BPA and nonylphenoxy acetic acid (NP1EC) significantly increase because of urban sources, 4-nonylphenol concentrations are homogeneous along the Seine River. These results suggest a global dissemination of 4-nonylphenol at the scale of the Seine River basin. Finally, the relationship between pollutant concentrations and Seine river flow were studied upstream and downstream of the Parisian conurbation. As a result, the clear decrease of NP1EC dissolved concentrations according to Seine River flow underlines the influence of punctual urban pollution on Seine River contamination.Conversely, 4-nonylphenol dissolved concentrations reinforce the hypothesis of its widespread at the scale of the Seine River basin. Keywords: Nonylphenol, bisphenol A, urban sources, Seine River, atmospheric fallout, heavily urbanized area 2 IntroductionAmong the pollutants commonly pointed out in the literature for their endocrine disrupting properties, alkylphenol ethoxylates (APE) and the 2,2-(4,4 hydroxydiphenyl) propane commonly named bisphenol A (BPA) deserve special attention because of their global spread in the environment (Staples et al. 1998; Vethaak et al. 2005). APE, mainly composed of nonylphenol ethoxylate (NPE: 80%) and octylphenol ethoxylate (OPE: 20%), are widely used for industrial and domestic applications, such as lubricating, oil additives, detergents and antistatic agents (Ying et al. 2002). A reasonable estimate of the world annual production of NPE is around 500,000 tons (Ying et al. 2002). BPA is mainly used as a monomer in the manufacture of polycarbonate plastics known for its high resistance to shocks and temperature (plastic windows or greenhouses, car bumpers, baby bottles), and in epoxy resins used as food contact lacquer for cans and tin cans. Due to its uses, the world production of BPA was evaluated at about 3,000,000 tons (Vandenberg et al. 2007)While BPA is recognized as an endocrine disrupting chemical (Wetherill et al. 2007), NPE and OPE have been of rising concern because of their biodegradation by-products. Indeed, in urban or natural environment NPE can be biodegraded through oxidative or non-oxidative pathways (John and White 1998;Jonkers et al. 2001). Under oxidative biodegradation pathway, NPE turn i...

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Budget of N<sub>2</sub>O emissions at the watershed scale: role of land cover and topography (the Orgeval basin, France)

Cited by 15 publications

References 60 publications

Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya

Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya

Design hydrograph estimation in small and fully ungauged basins: a preliminary assessment of the EBA4SUB framework

Alkylphenolic compounds and bisphenol A contamination within a heavily urbanized area: case study of Paris

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Budget of N&lt;sub&gt;2&lt;/sub&gt;O emissions at the watershed scale: role of land cover and topography (the Orgeval basin, France)

Cited by 15 publications

References 60 publications

Spatial variability of soil N2O and CO2 fluxes in different topographic positions in a tropical montane forest in Kenya

Spatial variability of soil N2O and CO2 fluxes in different topographic positions in a tropical montane forest in Kenya

Design hydrograph estimation in small and fully ungauged basins: a preliminary assessment of the EBA4SUB framework

Alkylphenolic compounds and bisphenol A contamination within a heavily urbanized area: case study of Paris

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Budget of N<sub>2</sub>O emissions at the watershed scale: role of land cover and topography (the Orgeval basin, France)

Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya

Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya