Pierre Cellier

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In-canopy turbulence is a required input to study pollutant cycling and chemistry within plant canopies and to link concentrations and sources. Despite the importance of grasslands worldwide, most previous work has focused on forests and crops. Here, turbulence parameters in a mature agricultural grassland canopy were measured with 5 a combination of a(More)
Agricultural livestock represents the main source of ammonia (NH 3) in Europe. In recent years, reduction policies have been applied to reduce NH 3 emissions. In order to estimate the impacts of these policies, robust estimates of the emissions from the main sources, i.e. livestock farms are needed. In this paper, the NH 3 emissions were estimated from a(More)
Biogeosciences Discussions This discussion paper is/has been under review for the journal Biogeosciences (BG). Please refer to the corresponding final paper in BG if available. Abstract Approximately 65 % of anthropogenic emissions of N 2 O, a potent greenhouse gas, originate from soils at global scale, and particularly after N fertilisation of the main(More)
Stomatal ammonia compensation points (χ s) of grass species on a mixed fertilized grassland were determined by measurements of apoplastic NH 4 + and H + in the field. Calculated χ s-values were compared with in-canopy atmospheric NH 3 concentrations (χ a) measured by micrometeorological techniques. 5 Leaf apoplastic NH 4 + did not significantly differ(More)
Grassland is a canopy with a complex structure where sources and sinks of ammonia may coexist at the plant level. Moreover, management practices such as mowing, hay production and grazing, may change the composition of the sward and hence the source-sinks relationship at the canopy level as well as the interaction with the 5 atmosphere. There is therefore a(More)
A major international experiment on ammonia (NH 3) biosphere-atmosphere exchange was conducted over intensively managed grassland at Braunschweig, Germany. The experimental strategy was developed to allow an integrated analysis of different features of NH 3 exchange including: a) quantification of nearby emissions and advection 5 effects, b) estimation of(More)
Biogeosciences Discussions This discussion paper is/has been under review for the journal Biogeosciences (BG). Please refer to the corresponding final paper in BG if available. Abstract Leaf nitrogen and leaf surface area influence the exchange of gases between terrestrial ecosystems and the atmosphere, and they play a significant role in the global cycles(More)
  • B Loubet, C Decuq, E Personne, R S Massad, C Flechard, O Fanucci +7 others
  • 2011
Biogeosciences Discussions This discussion paper is/has been under review for the journal Biogeosciences (BG). Please refer to the corresponding final paper in BG if available. Abstract Ammonia concentration and fluxes were measured above a growing triticale field for two months during May and June 2010 at the NitroEurope crop site in Grignon (Fr-Gri) near(More)