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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Record number 455735
Title Differential Effects of Oxidised and Reduced Nitrogen on Vegetation and Soil Chemistry of Species-Rich Acidic Grasslands
Author(s) Dorland, E.; Stevens, C.J.; Gaudnik, C.; Corcket, E.; Rotthier, S.L.F.; Wotherspoon, K.; Jokerud, M.; Vandvik, V.; Soons, M.B.; Hefting, M.M.; Aarrestad, P.A.; Alard, D.; Diekmann, M.; Dupre, C.; Dise, N.B.; Gowing, D.J.G.; Bobbink, R.
Source Water Air and Soil Pollution 224 (2013)9. - ISSN 0049-6979
DOI https://doi.org/10.1007/s11270-013-1664-4
Department(s) Plant Ecology and Nature Conservation
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) biological nitrification inhibition - terrestrial ecosystems - seminatural grasslands - heathland vegetation - deposition - plant - acidification - biodiversity - diversity - eutrophication
Abstract Emissions and deposition of ammonia and nitrogen oxides have strongly increased since the 1950s. This has led to significant changes in the nitrogen (N) cycle, vegetation composition and plant diversity in many ecosystems of high conservation value in Europe. As a consequence of different regional pollution levels and of the increased importance of reduced N in the near future, determining the effect of different forms of N is an important task for understanding the consequences of atmospheric N inputs. We have initiated three replicated N addition experiments in species-rich, acidic grasslands spanning a climatic gradient in the Atlantic biogeographic region of Europe in Norway, Wales and France at sites with low levels of pollution. N was added in two doses (0 and 70 kg N ha(-1) year(-1) above background) and in three forms (oxidised N, reduced N and a 50-50 combination). After 2.5 years of N additions, the effects of these treatments on plant biomass, plant nutritional status, soil pH and soil nutrient availability were determined. Impacts of the N additions were observed within the 2.5-year research period. In some cases, the first signs of differential effects of N form could also be demonstrated. In the French site, for example, grass biomass was significantly increased by the oxidised N treatments but decreased by the reduced N treatments. In the Norwegian site, the reduced N treatments significantly reduced soil pH, whereas oxidised N did not. Effects on nutrient availability were also observed. These experiments will be continued to elucidate the longer term impacts of N deposition on these grasslands.
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