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	volume = {20},
	year = {2014},
	pages = {566-580},
	keywords = {ammonium, atmospheric nitrogen, boreal mire, calluna, calluna-vulgaris, chronology, cover, critical loads, dry heathland, field manipulation, global change, growth, n deposition, nitrate, peatland, plant, sphagnum bogs, sphagnum capillifolium, vegetation},
	author = {Sheppard, L. J. and Leith, I. D. and Mizunuma, T. and Leeson, S. and Kivimaki, S. and Cape, J. N. and van Dijk, N. and Leaver, D. and Sutton, M. A. and Fowler, D. and Van den Berg, L. J. L. and Crossley, A. and Field, C. and Smart, S.}
}
@article {1568,
	title = {Inertia in an ombrotrophic bog ecosystem in response to nine years{\textquoteright} realistic perturbation by wet deposition of nitrogen, separated by form.},
	volume = {20},
	year = {2014},
	pages = {566-580},
	author = {Sheppard L.J. and Leith, I.D. and Mizunuma, T. and Leeson, S. and Kivimaki, S. and Cape, J.N. and van Dijk, N. and Leaver, D. and Sutton, M.A. and Fowler, D. and Van Den Berg, L.J.L. and Crossley, A. and Field, C. and Smart, S.}
}
@article {1679,
	title = {Inertia in an ombrotrophic bog ecosystem in response to nine years{\textquoteright} realistic perturbation by wet deposition of nitrogen, separated by form},
	year = {2013},
	author = {Sheppard, L.J. and Leith, I.D. and Mizunuma, T. and Leeson, S. and Kivimaki, S.K. and Cape, J.N. and van Dijk, N. and Leaver, D. and Sutton, M.A. and Fowler, D. and Van Den Berg, L.J.L. and Crossley, A. and Field, C. and Smart, S.M.}
}
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	volume = {153},
	year = {2012},
	pages = {17-24},
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	volume = {18},
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	pages = {290-300},
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@article {1362,
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	volume = {159},
	year = {2011},
	pages = {140- 147},
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@article {1675,
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	volume = {159 },
	year = {2011},
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	author = {Stevens, C.J. and Manning, P. and Van Den Berg, L.J.L. and De Graaf, M.C.C. and Wamelink, G.W.W. and Boxman, A.W. and Bleeker, A. and Vergeer, P. and Arroniz-Crespo, M. and Limpens, J. and Lamerse, L.P.M. and Bobbink, R. and Dorland, E.}
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@article {1310,
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	number = {Forest Research Monograph, 2},
	year = {2011},
	pages = {212pp},
	institution = {Forest Research},
	abstract = {<p>\&nbsp;</p><p>\&nbsp;</p>},
	isbn = {978-0-85538-827-0},
	author = {Vanguelova, E. and Pitman, R.}
}
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	title = {Nitrogen deposition as a threat to European Terrestrial Biodiversity},
	booktitle = {European Nitrogen Assessment},
	year = {2011},
	pages = {463-494},
	publisher = {Cambridge University Press},
	organization = {Cambridge University Press},
	chapter = {20},
	author = {Dise, N.B. and Ashmore, M.R. and Belyazid S and Bleeker, A. and Bobbink, R. and de Vries, W. and Erisman, J.W. and Spranger, T. and Stevens, C.J. and Van Den Berg, L.J.L.}
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@article {1342,
	title = {UK Status Report July 2011: Update to empirical critical loads of nitrogen},
	year = {2011},
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	author = {Hall, R.J. and Emmett, B. and Garbutt, A. and Jones, L and Rowe, E. and Sheppard, L and Vanguelova, E. and Pitman, R. and Britton, A. and Hester, A. and Ashmore, M. and Power, S. and Caporn, S.}
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@article {1575,
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	volume = {158},
	year = {2010},
	pages = {1857-1869},
	author = {Vanguelova, E.I. and Benham, S. and Pitman, R. and Moffat, A.J. and Broadmeadow, M. and Nisbet, T. and Durrant, D. and Barsoum, N. and Wilkinson, M. and Bochereau, F. and Hutchings, T. and Broadmeadow, S. and Crow, P. and Taylor, P. and Houston, T.D.}
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@article {1677,
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	volume = {17},
	year = {2010},
	pages = {1871-83},
	author = {Van Den Berg, L.J.L. and Vergeer, P. and Rich, T.C.G. and Smart, S.M. and Guest, D. and Ashmore, M.R.}
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@article {1696,
	title = {Global assessment of nitrogen deposition effects on terrestrial plant diversity: a synthesis},
	volume = {20},
	year = {2010},
	pages = {30-59},
	keywords = {arctic polar semidesert, arctic-alpine ecosystems, atmospheric deposition, boreal ecosystems, critical loads, diversity, ecoregions, long-term, mediterranean ecosystems, n-deposition, nitrogen deposition, nutrient limitation, racomitrium-lanuginosum, simulated environmental-change, southern california, species richness, temperature ecosystems, terrestrial ecosystems, tropical ecosystems, western united-states},
	author = {Bobbink, R. and Hicks, K. and Galloway, J. and Spranger, T. and Alkemade, R. and Ashmore, M. and Bustamante, M. and Cinderby, S. and Davidson, E. and Dentener, F. and Emmett, B. and Erisman, J. W. and Fenn, M. and Gilliam, F. and Nordin, A. and Pardo, L. and de Vries, W.}
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	volume = {157},
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	title = {Interpreting nitrogen pollution thresholds for sensitive habitats: The importance of concentration versus dose},
	volume = {152},
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@article {1703,
	title = {Reduced nitrogen has a greater effect than oxidised nitrogen on dry heathland vegetation},
	volume = {154},
	year = {2008},
	pages = {359-369},
	keywords = {acidification, amino acids, ammonium toxicity, competition, decline, deposition, grass encroachment, herbaceous species, mesocosins, n enrichiuent, netherlands, nh4+/no3- ratios, nitrate, pinus-nigra, soil, vascular plants},
	author = {Van den Berg, L. J. L. and Peters, C. J. H. and Ashmore, M. R. and Roelofs, J. G. M.}
}
@inbook {1282,
	title = {Sources, dispersion and fate of atmospheric ammonia},
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	year = {2008},
	pages = {333-393.},
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	volume = {450},
	year = {2007},
	pages = {537-539},
	author = {Monteith, D.T. and Stoddard, J.L. and Evans, C.D. and De Wit, H.A. and Forsius, M. and Hogasen, T. and Wilander, A. and Skjelkvale, B.L. and Jeffries, D.S. and Vuorenmaa, J. and Keller, B. and Kop{\'a}cek, J. and Vesely, J.}
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@article {1470,
	title = {Chemical composition and decomposition of silver birch leaf litter produced under elevated CO2 and O3.},
	volume = {282},
	year = {2006},
	pages = {261-280},
	author = {Kasurinen, A. and Riikonen, J. and Oksanen, E. and Vapaavuori, E. and Holopainen, T.}
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@article {1453,
	title = {O3 impacts on plant development: a meta-analysis of root/shoot allocation and growth. },
	volume = {29},
	year = {2006},
	pages = {1193-1209},
	author = {Grantz, D.A. and Gunn, S. and Vu, H.B.}
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@article {1481,
	title = {Decline of acid-sensitive plant species in heathland can be attributed to ammonium toxicity in combination with low pH.},
	volume = {166},
	year = {2005},
	pages = {551-564},
	author = {Van Den Berg, L.J. and Dorland, E. and Vergeer, P. and Hart, M.A.C. and Bobbink, R. and Roelofs, J.G.}
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@article {1524,
	title = {Impact of rising tropospheric ozone on potato: effects on photosynthesis, growth, productivity and yield quality.},
	volume = {28},
	year = {2005},
	pages = {982-996},
	author = {Vandermeiren, K. and Black, C. and Pleijel, H. and De Temmerman, L.}
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@article {1360,
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	volume = {142 },
	year = {2005},
	pages = {159{\textendash}168.},
	author = {Van der Wal, R. and Pearce, I.S.K. and Brooker, R.W.}
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@article {1477,
	title = {Aluminium concentration versus the base cation to aluminium ratio as predictors for aluminium toxicity in Pinus sylvestris and Picea abies seedlings.},
	volume = {195},
	year = {2004},
	pages = {301-309},
	author = {Van Scholl, L. and Keltjens, W.G. and Hoffland, E. and Van Breemen, N.}
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	title = {Differential effects of nitrate and ammonium on three fen bryophyte species in relation to pollutant nitrogen input.},
	volume = {164},
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	author = {Paulissen, M.P.C.P. and van der Ven, P.J.M. and Dees, A.J. and Bobbink, R.}
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	volume = {38},
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	title = {Silver birch and climate change: variable growth and carbon allocation responses to elevated concentrations of carbon dioxide and ozone.},
	volume = {24},
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	pages = {1227-1237},
	author = {Riikonen, J. and Lindsberg, M.M. and Holopainen, T. and Oksanen, E. and Lappi, J. and Peltonen, P. and Vapaavuori, E.}
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@article {1358,
	title = {Interplay between nitrogen deposition and grazing causes habitat degradation},
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	pages = {141-146},
	author = {Van der Wal, R. and Pearce, I. and Brooker, R. and Scott, D. and Welch, D. and Woodin, S.}
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@article {1574,
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	volume = {35},
	year = {2003},
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	author = {Van Herk, C.M. and Mathijssen-Spiekman, E.A.M. and De Zwart, D.}
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	volume = {160 },
	year = {2003},
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	author = {Pearce, I.S.K. and Woodin, S.J. and Van der Wal, R.}
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	title = {Effects of nitrogen deposition on growth and survival of montane Racomitrium lanuginosum heath},
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	pages = {285-290},
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	chapter = {Epiphytes on wayside trees as an indicator of eutrophication in the Netherlands},
	address = {Dordrecht},
	author = {Van Herk, C.M. and Nimis, P.L. (Eds) and Scheidegger, C. (Eds) and Wolseley, P.A.}
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	title = {Bark pH and susceptibility to toxic air pollutants as independent causes of changes in epiphytic lichen composition in space and time},
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	keywords = {agriculture, england, netherlands, pollution, quercus-petraea, vegetation},
	author = {van Herk, C. M.}
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@article {2006,
	title = {Beneficial effects of the growth of metal tolerant grass on biological and chemical parameters in copper and zinc contaminated sandy soils},
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	author = {Vickery, J.A. and Tallowin, J.R. and Feber, R.E. and Asteraki, E.J. and Atkinson, P.W. and Fuller, R.J. and Brown, V.K.}
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@inbook {620,
	title = {Terrestrial ecosystem research in Europe: successes, challenges and policy},
	year = {2001},
	note = {Final Conference of the Terrestrial Ecosystem Research Initiative - Concerted Action (TERICA) Project ENV4-CT95-0051
Egmond aan Zee, the Netherlands, 20-23 June 1999. },
	publisher = {Directorate-General for Research},
	organization = {Directorate-General for Research},
	chapter = {Preliminary results of the BERI project: Effects of elevated CO2 and N deposition on plant dynamics and CH4 emissions of five},
	address = {Brussels.},
	author = {Hoosebeak, M.R. and van Breeman, N. and Wallen, B. and Rydin, H. and Lee, J.A. and Sivola, J. and Vasander, H. and Berendse, F. and Grosvernier, P. and Sutton, M.A. (Eds) and Moreno, J.M. (Eds) and Van der Putten, W.H. (Eds) and Struwe, S. (Eds)}
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@article {533,
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	year = {2000},
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@article {1137,
	title = {Assessing the chronic effects of atmospheric tetrachloroethylene (PER) on plants. Note 48},
	year = {2000},
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@article {264,
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@article {821,
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