dynamics of ammonia exchange with cut grassland: strategy and implementation of the graminae integrated experiment
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ID: 198846
2009
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Abstract
A major international experiment on ammonia (NH<sub>3</sub>) 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<sub>3</sub> exchange including: a) quantification of nearby emissions and advection effects, b) estimation of net NH<sub>3</sub> fluxes with the canopy by a range of micrometeorological measurements, c) analysis of the sources and sinks of NH<sub>3</sub> within the plant canopy, including soils and bioassay measurements, d) comparison of the effects of grassland management options on NH<sub>3</sub> fluxes and e) assessment of the interactions of NH<sub>3</sub> fluxes with aerosol exchange processes. Additional technical objectives included the inter-comparison of different estimates of sensible and latent heat fluxes, as well as continuous-gradient and Relaxed Eddy Accumulation (REA) systems for NH<sub>3</sub> fluxes. <br><br> The prior analysis established the spatial and temporal design of the experiment, allowing significant synergy between these objectives. The measurements were made at 7 measurement locations, thereby quantifying horizontal and vertical profiles, and covered three phases: a) tall grass canopy prior to cutting (7 days), b) short grass after cutting (7 days) and c) re-growing sward following fertilization with ammonium nitrate (10 days). The sequential management treatments allowed comparison of sources-sinks, advection and aerosol interactions under a wide range of NH<sub>3</sub> fluxes. <br><br> This paper describes the experimental strategy and reports the grassland management history, soils, environmental conditions and air chemistry during the experiment, finally summarizing how the results are coordinated in the accompanying series of papers.
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sutton2009biogeosciencesdynamics
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| Authors | ;M. A. Sutton;E. Nemitz;M. R. Theobald;C. Milford;J. R. Dorsey;M. W. Gallagher;A. Hensen;P. A. C. Jongejan;J. W. Erisman;M. Mattsson;J. K. Schjoerring;P. Cellier;B. Loubet;R. Roche;A. Neftel;B. Hermann;S. K. Jones;B. E. Lehman;L. Horvath;T. Weidinger;K. Rajkai;J. Burkhardt;F. J. Löpmeier;U. Daemmgen |
| Journal | tetrahedron letters |
| Year | 2009 |
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