Dynamics of ammonia exchange with cut grassland: Synthesis of results and conclusions of the GRAMINAE Integrated Experiment

Biogeosciences

Volumn 6, Issue 12, 2009, Pages 2907-2934

  Sutton, M A ^a   Nemitz, E ^a   Milford, C ^a,l   Campbell, C ^a   Erisman, J W ^b   Hensen, A ^b   Cellier, P ^c   David, M ^c   Loubet, B ^c   Personne, E ^c   Schjoerring, J K ^d   Mattsson, M ^d,m   Dorsey, J R ^e   Gallagher, M W ^e   Horvath, L ^f   Weidinger, T ^g   Meszaros, R ^g   Dammgen U ^h   Neftel, A ⁱ   Herrmann, B ⁱ   Lehman, B E ⁿ   Flechard, C ^j   Burkhardt, J ^k   more..

^a CENTRE FOR ECOLOGY AND HYDROLOGY   (United Kingdom)

^b TNO   (Netherlands)

^c CEMAGREF   (France)

^d UNIVERSITY OF COPENHAGEN   (Denmark)

^e UNIVERSITY OF MANCHESTER   (United Kingdom)

^f HUNGARIAN METEOROLOGICAL SERVICE   (Hungary)

^g EÖTVÖS LORÁND UNIVERSITY   (Hungary)

^h THÜNEN INSTITUTE OF CLIMATE SMART AGRICULTURE   (Germany)

ⁱ Eidg Forschungsanstalt fur Agrarokologie und Landbau   (Switzerland)

^j UMR SAS   (France)

^k UNIVERSITY OF BONN   (Germany)

^l INSTITUTE OF EARTH SCIENCES JAUME ALMERA   (Spain)

^m HALMSTAD UNIVERSITY   (Sweden)

ⁿ UNIVERSITY OF BERN   (Switzerland)

more..

Author keywords

[No Author keywords available]

Indexed keywords

AERODYNAMICS; AGRICULTURAL EMISSION; AGRICULTURAL MANAGEMENT; AMMONIA; BIOLOGICAL PRODUCTION; GRASS; GRASSLAND; ION EXCHANGE; MICROMETEOROLOGY;

EID: 77955458448     PISSN: 17264170     EISSN: 17264189     Source Type: Journal    
DOI: 10.5194/bg-6-2907-2009     Document Type: Article

References (79)

1. Achermann, B. and Bobbink, R. (Eds.): Empirical critical loads for Nitrogen. SAEFL, Berne, Switzerland, 2003.
2. Amann, M., Bertok, I., Cofala, J., Gyarfas, F., Heyes, C., Klimont, Z., Schöpp, W., and Winiwarter, W.: Baseline Scenarios for the Clean Air for Europe (CAFE) Programme. IIASA, Laxenburg, Austria, online available at: www.iiasa.ac.at/rains/CAFEfiles/CAFE-baseline-full.pdf, 2005.
3. Bigg, E. K.: Gas emissions from soil and leaf litter as a source of new particle formation, Atmos. Res., 70, 33-42, 2004. (Pubitemid 38427625)
4. 3 near the surface, J. Geophys. Res., 93, 7137-7152, 1988.
5. Burkhardt, J. and Eiden, R. Thin water films on coniferous needles. Atmos. Environ. 28A, 2002-1019, 1994.
6. Burkhardt, J., Flechard, C. R., Gresens, F., Mattsson, M., Jongejan, P. A. C., Erisman, J.W.,Weidinger, T.,Meszaros, R., Nemitz, E., and Sutton, M. A.: Modelling the dynamic chemical interactions of atmospheric ammonia with leaf surface wetness in a managed grassland canopy, Biogeosciences, 6, 67-83, 2009, http://www.biogeosciences.net/6/67/2009/.
7. 3 dry deposition to a fumigated ombrotrophic bog using concentrationdependent deposition velocities, Atmos. Environ. 42, 6637-6646, 2008.
8. Cellier, P., Richard, G., and Robin, P.: Partition of sensible heat fluxes into bare soil and the atmosphere, Agr. Forest Meteorol., 82, 245-265, 1996.
9. Choudhury, B. J. and Monteith, J. L.: A four-layer model for the heat budget of homogeneous land surfaces. Quart. J. Roy. Meteorol. Soc., 114, 373-398, 1988.
10. David, M., Loubet, B., Cellier, P., Mattsson, M., Schjoerring, J.K., Nemitz, E., Roche, R., Riedo, M., and Sutton, M. A.: Ammonia sources and sinks in an intensively managed grassland, Biogeosciences, 6, 1903-1915, 2009a.
11. David, M., Roche, R., Mattsson, M., Sutton, M. A., Dämmgen, U., Schjoerring, J. K., and Cellier, P.: The effects of management on ammonia fluxes over a grassland as measured by use of dynamic chambers, Biogeosciences Discuss., 6, 1599-1623, 2009b, http://www.biogeosciences-discuss.net/6/1599/ 2009/.
12. Davidson, C. I., Phalen, R. F., and Solomon, P. A.: Airborne Particulate Matter and Human Health: A Review, Aerosol Sci. Tech. 39, 737-749, 2005. (Pubitemid 41361593)
13. de Vries, W., Solberg, S., Dobbertin, M., Sterba, H., Laubhahn, D., Reinds, G. J., Nabuurs, G.-J., Gundersen, P., and Sutton, M. A.: Ecologically implausible carbon response?, Nature, 451, E1-E3, doi:10.1038/nature06579, 2008. (Pubitemid 351253170)
14. Demmers, T. G. M., Burgess, L. R., Short, J. L., Phillips, V. R., Clark, J. A., and Wathes, C. M.: Ammonia emissions from two mechanically ventilated UK livestock buildings. Atmos. Environ., 33, 107-116, 1999.
15. Denmead, O. T., Freney, J. R., and Simpson, J. R.: A closed ammonia cycle within a plant canopy, Soil Sci. Biochem. 8, 161-164, 1976.
16. Döhler, H., Dämmgen, U., Berg, W., Bergschmidt, A., Brunsch, R., Eurich-Menden, B., Lüttich, M., and Osterburg, B.: Adaptation of the German emission calculation methodology to international guidelines, determination and forecasting of ammonia emissions from German agriculture, and scenarios for reducing them by 2010 (German, English summary), Umweltbundesamt, Berlin, Germany, 2002.
17. Dragosits, U., Theobald,M. R., Place, C. J., Lord, E.,Webb, J., Hill, J., ApSimon, H. M., and Sutton, M. A.: Ammonia, emission, deposition and impact assessment at a field scale: a case study of sub-grid spatial variability, Environ. Poll., 117, 147-158, 2002. (Pubitemid 34076457)
18. Duyzer, J. H., Nijenhuis, B., and Weststrate, H.: Monitoring and modelling of ammonia concentrations and deposition in agricultural areas of the Netherlands, Water Air Soil Pollut.: Focus 1, 131-144, 2001.
19. Erisman J. W. and Sutton M. A.: Reduced nitrogen in ecology and the environment: Special issue of the ESF-FWF Conference in partnership with LFUI, Environ. Pollut., 154, 357-358, 2008a.
20. Erisman, J. W., Sutton, M. A., Galloway, J. N., Klimont, Z., and Winiwarter, W.: How a century of ammonia synthesis changed the world. Nature Geosci., 1, 636-639, 2008b.
21. Famulari, D., Fowler, D., Hargreaves, K., Milford, C., Sutton, M. A., Nemitz, E., and Weston, K.: Measuring eddy-covariance fluxes of ammonia using tunable diode laser absorption spectroscopy, Water Air Soil Pollut. Focus, 4(6), 151-158, 2004. (Pubitemid 40398254)
22. Flechard, C., Fowler, D., Sutton, M. A., and Cape, J. N.: A dynamic chemical model of bi-directional ammonia exchange between semi-natural vegetation and the atmosphere, Q. J. Roy. Meteor. Soc., 125, 2611-2641, 1999. (Pubitemid 30024892)
23. Hensen, A., Nemitz, E., Flynn, M. J., Blatter, A., Jones S. K., Sørensen, L. L., Hensen, B., Pryor, S., Jensen, B., Otjes, R. P., Cobussen, J., Loubet, B., Erisman, J. W., Gallagher, M. W., Neftel, A., and Sutton M. A.: Inter-comparison of ammonia fluxes obtained using the Relaxed Eddy Accumulation technique, Biogeosciences, 6, 2575-2588, 2009a, http://www.biogeosciences.net/6/2575/2009/.
24. 3 emissions from a naturally ventilated livestock farm using local-scale atmospheric dispersion modelling, Biogeosciences, 6, 2847-2860, 2009b, http://www.biogeosciences.net/6/2847/2009/.
25. Herrmann, B., Mattsson, M., Jones, S. K., Cellier, P., Milford, C., Sutton, M. A., Schjoerring, J. K., and Neftel, A.: Vertical structure and diurnal variability of ammonia exchange potential within an intensively managed grass canopy, Biogeosciences, 6, 15-23, 2009, http://www.biogeosciences.net/6/ 15/2009/.
26. Hertel, O., Skjøth, C. A., Lofstrøm, P., Geels, C., Frohn, L. M., Ellermann, T., and Madsen, P. V.: Modelling nitrogen deposition on a local scale - A review of the current state of the art. Environ. Chem. 3, 317-337, 2006. (Pubitemid 44657281)
27. 4 in plant tissue, xylem sap and apoplastic fluid, Physiol. Plantarum, 109(2), 167-179, 2000a. (Pubitemid 30410863)
28. Husted, S., Schjoerring, J. K., Nielsen, K. H., Nemitz, E., and Sutton, M. A.: Stomatal compensation points for ammonia in oilseed rape plants under field conditions, Agr. For, Meteorol., 105, 371-383, 2000b.
29. 4 production in leaves of wildtype and GS2-antisense oilseed rape, Plant Physiol., 130, 989-998, 2002. (Pubitemid 35224798)
30. Jarvis, P. G.: The interpretation of the variation in leaf water potential and stomatal conductance found in canopies in the field, Phil. Trans. Roy. Soc. London, B273, 593-610, 1976.
31. 2 by a wet annular denuder system, Atmos.Environ., 22, 2541-2548, 1988. (Pubitemid 19013862)
32. Kulmala, M., Vehkamaki, H., Petajda, T., Dal Maso, M., Lauri, A., Kerminen, V. M., Birmil, W., and McMurry, P. H.: Formation and growth rates of ultrafine atmospheric particles: a review of observations, J. Aerosol Sci., 35(2), 143-176, 2004. (Pubitemid 38115144)
33. Laubach, J. and Teichmann, U.: Surface energy budget variability: A case study over grass with special regard to minor inhomogeneities in the source area, Theoret. Appl. Climatol., 62, 9-24, 1999. (Pubitemid 29298416)
34. Lehmann, B. E., Hehmann, M., Neftel, A., and Tarakanov, S. V.: Radon-220 calibration of near surface turbulent gas transport, Geophys. Res. Lett., 26(5), 607-610, 1999. (Pubitemid 29276377)
35. Loubet, B., Asman, W. A. H., Theobald, M. R., Hertel, O., Tang, Y. S., Robin, P., Hassouna, M., Daemmgen, U., Genermont, S., Cellier, P., and Sutton, M. A.: Ammonia deposition near hot spots: processes, models and monitoring methods, in: Atmospheric Ammonia: Detecting emission changes and environmental impacts edited by: Sutton, M. A., Baker, S., and Reis, S., 205-267, Springer, 2009a.
36. Loubet, B., Cellier, P., Milford, C., and Sutton, M. A.: A coupled dispersion and exchange model for short-range dry deposition of atmospheric ammonia, Q. J. Roy. Meteor. Soc., 132, 1733-1763, 2006. (Pubitemid 44405283)
37. 4 and pH in n intensively managed grassland, Plant Soil, 238, 97-110, 2002. (Pubitemid 34220256)
38. Loubet, B., Milford, C., Hensen, A., Dämmgen, U., Cellier, P., and Sutton, M. A.: Advection of ammonia over a pasture field, and its effect on gradient flux measurements, Biogeosciences, 6, 1295-1309, 2009b.
39. Loubet, B., Milford, C., Sutton, M. A., and Cellier, P.: Investigation of the interaction between sources and sinks of atmospheric ammonia in an upland landscape using a simplified dispersionexchange model, J. geophys Res., 106, 24183-24195, 2001.
40. Magnani, F., Mencuccini, M., Borghetti, M., Berbigier, P., Berninger, F., Delzon, S., Grelle, A., Hari, P., Jarvis, P. G., Kolari, P., Kowalski, A. S., Lankreijer, H., Law, B. E., Lindroth, A., Loustau, D., Manca, G., Moncrieff, J. B., Rayment, M., Tedeschi, V., Valentini, R., and Grace, J.: The human footprint in the carbon cycle of temperate and boreal forests, Nature, 447,848-850, 2007. (Pubitemid 46920132)
41. Mattsson M., Herrmann B., David M., Loubet B., Riedo M., Theobald M.R., Sutton M.A., Bruhn D., Neftel A. and Schjoerring J.K.: Temporal variability in bioassays of the stomatal ammonia compensation point in relation to plant and soil nitrogen parameters in intensively managed grassland. Biogeosciences, 6, 171-179, 2009a, http://www.biogeosciences.net/6/171/2009/.
42. Mattsson, M., Herrmann, B., Jones, S. K, Neftel, A., Sutton, M. A., and Schjoerring, J. K.: Contribution of different grass species to plant-atmosphere ammonia exchange in intensively managed grassland. Biogeosciences, Biogeosciences, 6, 59-66, 2009b, http://www.biogeosciences.net/6/59/2009/.
43. 3 exchange in leaves of Lolium perenne and Bromus erectus to changes in root N supply, Plant Physiol., 128, 742-750, 2002. (Pubitemid 34190888)
44. Mattsson, M. and Schjoerring, J. K.: Senescence-induced changes in apoplastic and bulk tissue ammonia concentrations of ryegrass leaves, New Phytol., 160(3) 489-499, 2003. (Pubitemid 37502478)
45. Mészáros, R., Horváth, L. Weidinger, T., Neftel, A., Nemitz, E., Dämmgen, U., Cellier, P., and Loubet, B.: Measurement and modelling ozone fluxes over a cut and fertilised grassland, Biogeosciences, 6, 1987-1999, 2009.
46. 2 over upland moorland in the vicinity of agricultural land, J. geophys Res. Atmos., 106, 24169-24181, 2001a.
47. Milford, C., Theobald, M. R., Nemitz, E., and Sutton, M. A.: Dynamics of ammonia exchange in response to cutting and fertilizing in an intensively-managed grassland, Water Air Soil Poll. Focus, 1, 167-176, 2001b.
48. Milford, C., Theobald, M. R., Nemitz, E., Hargreaves, K. J., Horvath, L., Raso, J., Dämmgen, U., Neftel, A., Jones, S. K., Hensen A., Loubet B., Sutton M. A.: Ammonia fluxes in relation to cutting and fertilization of an intensively managed grassland derived from an inter-comparison of gradient measurements Biogeosciences 6, 819-834, 2009.
49. Misselbrook, T. H., Nicholson, F. A., Chambers, B. J., and Johnson, R. A.: Measuring ammonia emissions from land applied manure: an intercomparison of commonly used samplers and techniques, Environ. Poll., 135, 389-397, 2005. (Pubitemid 40327179)
50. 3flux measurements. In: Proc. 10th Nitrogen Workshop, Copenhagen, August 1999. II.49. Royal Veterinary and Agricultural University, Copenhagen, Denmark, 1999.
51. Nemitz, E., Dorsey, J. R., Flynn, M. J., Gallagher, M. W., Hensen, A., Owen, S., Dämmgen, U., and Sutton, M. A.: Aerosol fluxes and particle growth above managed grassland, Biogeosciences, 6, 1627-1645, 2009a.
52. Nemitz, E., Flynn, M., Williams, P. I., Milford, C., Theobald, M. R., Blatter, A., Gallagher, M. W., and Sutton, M. A.: A relaxed eddy accumulation system for the automated measurement of atmospheric ammonia fluxes, Water Air Soil Pollut. Focus 1, 189-202, 2001a.
53. Nemitz, E., Hargreaves, K. J., Neftel, A., Loubet, B., Cellier, P., Dorsey, J. R., Flynn, M., Hensen, A., Weidinger, T., Meszaros, R., Horvath, L., Dämmgen, U., Fruehauf, C., Löpmeier F. J., Gallagher, M. W., and Sutton, M. A.: Inter-comparison and assessment of turbulent and physiological exchange parameters of grassland, Biogeosciences, 6, 1445-1466, 2009b.
54. Nemitz, E., Loubet, B., Lehmann, B. E., Cellier, P., Neftel, A., Jones, S. K., Hensen, A., Ihly, B., Tarakanov, S., and Sutton, M. A.: Turbulence characteristics and transport mechanisms in grassland canopies, Biogeosciences, 6, 1519-1537, 2009c
55. Nemitz, E., Milford, C., and Sutton, M. A.: A two-layer canopy compensation point model for describing bi-directional biosphere/atmosphere exchange of ammonia, Q. J. Roy. Meteor. Soc. 127, 815-833, 2001b. (Pubitemid 32403724)
56. 4 equilibrium, Atmos. Chem. Phys., 4, 1025-1045, 2004,http://www.atmos-chem-phys.net/4/1025/ 2004/.
57. Nemitz, E., Sutton, M. A., Gut, A., San José, R., Husted, S., and Schjoerring, J. K.: Sources and sinks of ammonia within an oilseed rape canopy, Agric. For. Meteorol, (Ammonia Special Issue), 105(4), 385-404, 2000a.
58. Nemitz, E., Sutton, M. A., Schjoerring, J. K., Husted, S., andWyers, G. P.: Resistance modelling of ammonia exchange over oilseed rape, Agric. For. Meteorol. (Ammonia Special Issue), 105 (4), 405-425, 2000b.
59. 3: a model combining the surface energy balance and the bi-directional exchanges of ammonia at the field scale, Biogeosciences, 6, 1371-1388, 2009.
60. Riedo, M., Milford, C., Schmid, M., and Sutton, M. A.: Coupling soil-plant-atmosphere exchange of ammonia with ecosystem functioning in grasslands, Ecol. Model. 158, 83-110, 2002. (Pubitemid 35337263)
61. Schjoerring, J. K., Husted, S., and Mattsson, M.: Physiological parameters controlling plant-atmosophere ammonia exchange, Atmos. Environ. (Ammonia Special Issue) 32(3), 491-498, 1998. (Pubitemid 28142494)
62. Sutton, M. A. and Fowler, D.: A model for inferring bi-directional fluxes of ammonia over plant canopies. In: Proceedings of the WMO conference on the measurement and modelling of atmospheric composition changes including pollutant transport, World Meteorological Organization, Geneva, 179-182, 1993.
63. Sutton, M. A., Fowler, D., Moncrieff, J. B., and Storeton-West, R. L.: The exchange of atmospheric ammonia with vegetated surfaces. II: Fertilized vegetation, Q. J. Roy. Meteor. Soc., 119, 1047-1070, 1993. (Pubitemid 24398946)
64. Sutton, M. A., Burkhardt, J. K., Guerin, D., Nemitz, E., and Fowler, D.: Development of resistance models to describe measurements of bi-directional ammonia surface atmosphere exchange, Atmos. Environ. (Ammonia Special Issue) 32(3), 473-480, 1998a. (Pubitemid 28142492)
65. Sutton, M. A., Milford, C., Dragosits, U., Place, C. J., Singles, R. J., Smith, R. I., Pitcairn, C. E. R., Fowler, D., Hill, J., ApSimon, H. M., Ross, C., Hill, R., Jarvis, S. C., Pain, B. F., Phillips, V. C., Harrison, R., Moss, D., Webb, J., Espenhahn, S. E., Lee, D. S., Hornung, M., Ullyett, J., Bull, K. R., Emmett, B. A., Lowe, J., and Wyers, G. P.: Dispersion, deposition and impacts of atmospheric ammonia: quantifying local budgets and spatial variability, Environ. Pollut., 102, S1, 349-361b, 1998.
66. Sutton, M. A., Nemitz, E., Fowler, D., Wyers, G. P., Otjes, R. P., Schjoerring, J. K., Husted, S., Nielsen, K., San José, R., Moreno, J., Gallagher, M. W., and Gut, A.: Fluxes of ammonia over oilseed rape: Overview of the EXAMINE experiment, Agr. For. Meteorol. (Ammonia Special Issue) 105(4), 327-349, 2000.
67. Sutton, M. A., Milford, C., Nemitz, E., Theobald,M. R., Hill, P.W., Fowler, D., Schjoerring, J. K., Mattsson, M. E., Nielsen, K. H., Husted, S., Erisman, J. W., Otjes, R., Hensen, A., Mosquera, J., Cellier, P., Loubet, B., David, M., Genermont, S., Neftel, A., Blatter, A., Herrmann, B., Jones, S. K., Horvath, L., Führer, E., Mantzanas, K., Koukoura, Z., Gallagher, M., Williams, P., Flynn, M., and Riedo, M.: Biosphere-atmosphere interactions of ammonia with grasslands: experimental strategy and results from a new European initiative, Plant Soil, 228, 131-145, 2001a. (Pubitemid 32145146)
68. Sutton, M. A., Nemitz, E., Erisman, J. W., Beier, C., Butterbach Bahl, K., Cellier, C., de Vries, W., Cotrufo, F., Skiba, U., Di Marco, C., Jones, S., Laville, P., Soussana, J. F., Loubet, B., Twigg, M., Famulari, D., Whitehead, J., Gallagher, M. W., Neftel, A., Flechard, C., Herrmann, B., Calanca, P. L., Schjoerring, J. K., Daemmgen, U., Horvath, L., Tang, Y.S., Emmett, B. A., Tietema, A., Peñuelas, J., Kesik, M., Brueggemann, N., Pilegaard, K., Vesala, T., Campbell, C. L., Olesen, J. E., Dragosits, U., Theobald, M. R., Levy, P., Mobbs, D. C., Milne, R., Viovy, N., Vuichard, N., Smith, J. U., Smith, P.E., Bergamaschi, P., Fowler, D., and Reis, S.: Challenges in quantifying biosphere-atmosphere exchange of nitrogen species. Environ. Pollut. 150, 125-139, 2007. (Pubitemid 47595302)
69. Sutton, M. A., Erisman, J. W., Dentener, F., and Moeller, D.: Ammonia in the environment: from ancient times to the present, Environ. Pollut., 156, 583-604, 2008a.
70. Sutton, M. A., Nemitz, E., Theobald, M. R., Milford, C., Dorsey, J. R., Gallagher, M. W., Hensen, A., Jongejan, P. A. C., Erisman, J. W., Mattsson, M., Schjoerring, J. K., Cellier, P., Loubet, B., Roche, R., Neftel, A., Herrmann, B., Jones, S. K., Lehman, B. E., Horvath, L., Weidinger, T., Rajkai, K., Burkhardt, J., Löpmeier, F. J., and Dämmgen, U.: Dynamics of ammonia exchange with cut grassland: Strategy and implementation of the GRAMINAE Integrated Experiment, Biogeosciences, 6, 309-331, 2009a, http://www. biogeosciences.net/6/309/2009/.
71. Sutton, M. A., Nemitz, E., Milford, C., Campbell, C., Erisman, J. W., Hensen, A., Cellier, P., David, M., Loubet, B., Personne, E., Schjoerring, J. K.,Mattsson,M., Dorsey, J. R., Gallagher,M.W., Horvath, L., Weidinger, T., Meszaros, R., Dämmgen, U., Neftel, A., Herrmann, B., Lehman, B. E. Flechard, C., and Burkhardt, J.: Dynamics of ammonia exchange with cut grassland: Synthesis of results and conclusions, Biogeosciences Discuss., 6, 1121-1184, 2009b.
72. Sutton, M. A., Reis, S., and Baker, S. M. H. (Eds.): Atmospheric ammonia: detecting emission changes and environmental impacts, Springer, 2009c.
73. Sutton, M. A., Simpson, D., Levy, P. E., Smith, R. I., Reis, S., van Oijen, M., and de Vries, W.: Uncertainties in the relationship between atmospheric nitrogen deposition and forest carbon sequestration, Global Change Biol., 14, 2057-2063, doi:10.1111/j.1365-2486.2008.01636.x, 2008b.
74. Thomas, R. M., Trebs, I., Otjes, R., Jongejan, P. A. C., ten Brink, H., Phillips, G., Kortner, M., Meixner, F. X., and Nemitz, E.: An automated analyzer to measure surface-atmosphere exchange fluxes of water soluble inorganic aerosol compounds and reactive trace gases, Environ. Sci. Technol., 43, 1412-1418, 2009.
75. van Hove, L. W. A., Heeres, P., and Bossen, M. E.: The annual variation in stomatal ammonia compensation point of rye grass (Lolium perenne L.) leaves in an intensively managed grassland, Atmos. Environ., 36, 2965-2977, 2002. (Pubitemid 34626415)
76. Whitehead, D. C., Lockyer, D. R., and Raistrick, N.: The volatilization of ammonia from perennial ryegrass during decomposition, drying and induced senescence, Ann. Bot., 61, 567-571, 1988.
77. Whitehead, J. D., Twigg, M., Famulari, D., Nemitz, E., Sutton, M. A., Gallagher, M. W., and Fowler, D.: Evaluation of laser absorption spectroscopic techniques for eddy covariance flux measurements of ammonia, Environ. Sci. Technol., 42, 2041-2046, 2008. (Pubitemid 351497699)
78. Wilson, K., Goldstein, A., Falge, E., Aubinet, M., Baldocchi, D., Berbigier, P., Bernhofer, C., Ceulenmans, R., Dolman, H., Field, C., Grelle, A., Ibrom, A., Law, B. E., Kowalski, A., Meyers, T., Moncrieff, J., Monson, R., Oechel, W., Tenhunen, J., Valentini, R., and Verma, S.: Energy balance closure at FLUXNET sites, Agr. For. Meteor., 113, 223-243, 2002. (Pubitemid 35293761)
79. Wyers, G. P., Otjes, R. P., and Slanina, J.: A continuousflow denuder for the measurement of ambient concentrations and surface-exchange fluxes of ammonia, Atmos. Environ., 27, 2085-2090, 1993.