Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    We will mail you new results for this query: keywords==atmospheric ammonia
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Efficiency of agricultural measures to reduce nitrogen deposition in Natura 2000 sites
Kros, J. ; Gies, T.J.A. ; Voogd, J.C.H. ; Vries, W. de - \ 2013
Environmental Science & Policy 32 (2013). - ISSN 1462-9011 - p. 68 - 79.
stikstof - depositie - ammoniak - emissiereductie - landbouw - natura 2000 - overijssel - nitrogen - deposition - ammonia - emission reduction - agriculture - atmospheric ammonia - netherlands - woodland - farms
This paper quantifies the efficiency of emission control measures in agriculture at landscape scale on the N deposition and critical N load exceedances in Natura 2000 sites. The model INITIATOR2 was run with spatially explicit farm data to predict atmospheric emissions of ammonia. These emissions were input of an atmospheric transport model to assess the N deposition in the Natura 2000 sites. Using the Dutch province of Overijssel as a case study, calculations for the year 2006 show that only 35% of the N deposition in the Natura 2000 sites were caused by agricultural NH3 emissions within the province. Comparatively most cost-efficient measures were low-emission application, followed by measures to reduce the protein content in feed. Relocating farms out of the Natura 2000 sites was very cost inefficient. Since critical N depositions of the Natura 2000 sites in Overijssel are largely exceeded in more than 90% of the area, the evaluated abatement measures were, however, not effective to reduce the area exceeding critical loads when only applied within the province Overijssel. Reductions of N deposition to a level below critical loads can only be achieved with the support of national and international emission reductions.
Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats
Stevens, C.J. ; Manning, P. ; Berg, L.J.L. van den; Graaf, M.C.C. de; Wamelink, G.W.W. ; Boxman, A.W. ; Bleeker, A. ; Vergeer, P. ; Arroniz-Crespo, M. ; Limpens, J. ; Lamers, L.P.M. ; Bobbink, R. ; Dorland, E. - \ 2011
Environmental Pollution 159 (2011)3. - ISSN 0269-7491 - p. 665 - 676.
spruce picea-abies - soil solution chemistry - pinus-sylvestris l - atmospheric ammonia - throughfall deposition - nitrate reduction - acidic grasslands - intracellular ph - species richness - vascular plants
While it is well established that ecosystems display strong responses to elevated nitrogen deposition, the importance of the ratio between the dominant forms of deposited nitrogen (NHx and NOy) in determining ecosystem response is poorly understood. As large changes in the ratio of oxidised and reduced nitrogen inputs are occurring, this oversight requires attention. One reason for this knowledge gap is that plants experience a different NHx:NOy ratio in soil to that seen in atmospheric deposits because atmospheric inputs are modified by soil transformations, mediated by soil pH. Consequently species of neutral and alkaline habitats are less likely to encounter high NH4+ concentrations than species from acid soils. We suggest that the response of vascular plant species to changing ratios of NHx:NOy deposits will be driven primarily by a combination of soil pH and nitrification rates. Testing this hypothesis requires a combination of experimental and survey work in a range of systems.
Algorithms determining ammonia emission from buildings housing cattle and pigs and from manure stores
Sommer, S.G. ; Zhang, G.Q. ; Bannink, A. ; Chadwick, D. ; Misselbrook, T. ; Harrison, R. ; Hutchings, N.J. ; Menzi, H. ; Monteny, G.J. ; Oenema, O. ; Webb, J. - \ 2006
Advances in Agronomy 89 (2006). - ISSN 0065-2113 - p. 261 - 335.
digested animal slurry - deep-litter systems - amino-acid pattern - dairy-cow house - nitrous-oxide - laying hens - atmospheric ammonia - mechanistic model - fattening pigs - growing-pigs
Livestock excreta and manure stored in housing, in manure stores, in beef feedlots, or cattle hardstandings are the most important sources of ammonia (NH3) in the atmosphere. There is a need to quantify the emission, to assess the effect of emission on NH3 and ammonium (NH4+) deposition to ecosystems and on the health risks posed by NH4+-based particles in the air. To obtain a reliable estimate of the emission from these sources, the processes involved in the transfer of NH3 from the manure to the free atmosphere have to be described precisely. A detailed knowledge of the processes of NH3 transfer from the manure and transport to the free atmosphere will contribute to development of techniques and housing designs that will contribute to the reduction of NH3 emission to the atmosphere. For this reason, this review presents the processes and algorithms involved in NH3 emission from livestock manure in livestock buildings and manure stores for pigs and cattle. Emission from poultry buildings and following land application of manure, although significant sources of NH3, have been reported in earlier reviews and are not included here. A clear description of the features that contribute to the total NH3 emission from buildings will include information on stock class, diet and excreta composition, the distribution of emitting surfaces and knowledge of their mass transfer characteristics in relation to the building as a whole, as well as environmental variables. Other relevant information includes the quantity and composition of excreta produced by different classes of livestock and the influence of feeding regime; the influence of environmental variables on the production of NH3 from excreta; how excreta is distributed and managed in livestock buildings; and factors that affect mass transfer of NH3 in the building to the atmosphere outside. A major factor is the pH of the manure. There is a great need for algorithms that can predict pH as affected by feeding and management. This chapter brings together published estimates of NH3 emissions and abatement techniques, and relates these to the factors listed above (excreta, NH3 production, building, and mass transfer).
The annual variation in stomatal ammonia compensation point of rye grass (Lolium perenne L.) leaves in an intensively managed grassland
Hove, L.W.A. van; Heeres, P. ; Bossen, M.E. - \ 2002
Atmospheric Environment 36 (2002)18. - ISSN 1352-2310 - p. 2965 - 2977.
oilseed rape plants - atmospheric ammonia - seminatural vegetation - temperate grassland - sunflower leaves - apoplastic nh4+ - spring wheat - exchange - deposition - ph
The stomatal ammonia compensation point for ammonia (NH3) of an intensively managed pasture of rye grass (Lolium perenne L.) was followed from mid January till November 2000. Leaf samples were taken every week. Simultaneously, the ambient NH3 concentration was measured. Meteorological data (temperature, wind speed, rainfall and radiance) were collected from a nearby field station. The vacuum infiltration technique was used to isolate the apoplastic solution of the leaves. From the determined ammonium (NH4+) concentration and pH in the apoplast, the gaseous NH3 concentration inside the leaves was calculated, i.e. the so-called stomatal compensation point (¿s). Temperature appeared to have a predominant effect on ¿s, partly by affecting the equilibrium between gaseous NH3 inside the leaf and NH3 dissolved in the apoplast and partly by affecting physiological processes influencing the NH4+ concentration in the apoplast. Results of the present study suggest that these temperature effects were counteracting. On one hand temperature increase during early spring stimulated NH3 volatilisation from the apoplast, on the other hand it led to a decline in apoplastic NH4+ from 0.9 to 0.2 mM, thereby diminishing the emission potential of the leaf. The low NH4+ concentrations during spring and summer coincided with a low total leaf N content (
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