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  • Print publication year: 2011
  • Online publication date: May 2011

21 - Nitrogen as a threat to European soil quality

from Part IV - Managing nitrogen in relation to key societal threats


Executive summary

Nature of the problem

A large part of agricultural soils in Europe are exposed to high N inputs because of animal manure and chemical fertiliser use. Large parts of the European natural soils are exposed to high atmospheric N deposition.

High N inputs threaten soil quality, which may negatively affect food and biomass production and biodiversity and enhance emissions of harmful N compounds from soils to water and the atmosphere.


An overview of the major soil functions and soil threats are presented, including a description of the objectives of the European Soil Strategy.

The major N threats on soil quality for both agricultural and natural soils are related to changes in soil organic content and quality, soil acidification, and loss of soil diversity. These threats are described using literature.

Key findings/state of knowledge

Generally, N has a positive effect on soil quality of agricultural soils, because it enhances soil fertility and conditions for crop growth. However, it generally has a negative effect on soil quality of natural soils, because it results in changes in plant diversity.

Soil acts as a filter and buffer for N, and protects water and atmosphere against N pollution. However, the filter and buffer capacity of soils is frequently exceeded by excess of N in both agricultural and natural soils, which results in emission of N to the environment.


Adriano, D. C. (2001). Trace Elements in Terrestrial Environments: Biogeochemistry, Bioavailability, and Risks of Metals. Springer, New York.
Andersson, F. and Persson, T. (1988). Liming as a measure to improve soil and tree condition in areas affected by air pollution. National Swedish Environmental Protection Board, Uppsala.
Appelo, C. A. J. and Postma, D. (1999). Geochemistry, Groundwater and Pollution, 2nd edition., Balkema, Rotterdam.
Bååth, E. (1989). Effects of heavy metals in soil on microbial processes and populations: a review. Water, Air and Soil Pollution, 47, 335–379.
Bardgett, R. (2005). The Biology of Soil, a Community and Ecosystem Approach, Oxford University Press.
Bardgett, R. D., Mawdsley, J. L., Edwards, al. (1999). Plant species and nitrogen effects on soil biological properties of temperate upland grasslands. Functional Ecology, 13, 650–660.
Barrios, E. (2007). Soil biota, ecosystem services and land productivity. Ecological Economics, 64, 269–285.
Beier, C. and Rasmussen, L. (1994). Effects of who-ecosystem manipulations on ecosystem internal processes. Trends in Ecology and Evolution, 9, 218–223.
Berendse, F., Breemen, N., Rydin, al. (2001). Raised atmospheric CO2 levels and increased N deposition cause shifts in plant species composition and production in Sphagnum bogs. Global Change Biology, 7, 591–598.
Berg, B. (2000). Litter decomposition and organic matter turnover in northern forest soils. Forest Ecology and Management, 133, 13–22.
Bloemerts, M. and Vries, W. (2009). Relationships between nitrous oxide emissions from natural ecosystems and environmental factors. Alterra Wageningen UR, Wageningen, The Netherlands.
Boekhold, A. E. (1992). Field Scale Behaviour of Cadmium in Soil. Wageningen University Wageningen, The Netherlands.
Bolan, N. S., Adriano, D. C. and Curtin, D. (2003). Soil acidification and liming interactions with nutrient and heavy metal transformation and bioavailability. Advances in Agronomy, 78, 215–272.
Bowman, W. D., Cleveland, C. C., Halada, Ĺ., Hreško, J. and Baron, J. S. (2008). Negative impact of nitrogen deposition on soil buffering capacity. Nature Geoscience, 1, 767–770.
Boxman, A. W. and Roelofs, J. G. M. (1988). Some effect of nitrate versus ammonium nutrition on the nutrient fluxes in pinus-Sylvestris seedlings: effects of mycorrhizal infection. Canadian Journal of Botany, 66, 1091–1097.
Bruck, R. I. (1985). Decline of montane boreal ecosystems in the southern Appalachian mountains. Phytopathology, 75, 1338–1348.
Brussaard, L., Ruiter, P. C. and Brown, G. G. (2007). Soil biodiversity for agricultural sustainability. Agriculture, Ecosystems and Environment, 121, 233–244.
Butterbach-Bahl, K., Gundersen, P., Ambus, al. (2011). Nitrogen processes in terrestrial ecosystems. In: The European Nitrogen Assessment, ed. M. A. Sutton, C. M. Howard, J. W. Erisman et al., Cambridge University Press.
Chan, K. Y. (2001). An overview of some tillage impacts on earthworm population abundance and diversity: implications for functioning in soils. Soil and Tillage Research, 57, 179–191.
Chorley, G. P. H. (1981). The agricultural revolution in northern Europe, 1750–1880: nitrogen, legumes, and crop productivity. Economic History Review, 34, 71–93.
Christensen, B. T., Petersen, J. and Trentemøller, U. M. (2006). The Askov long-term experiments on animal manure and mineral fertilisers: The lermarken site 1894–2004. Aarhus University, Faculty of Agricultural Sciences, Tjele, Denmark.
Cole, L., Buckland, S. M. and Bardgett, R. D. (2005). Relating microarthropod community structure and diversity to soil fertility manipulations in temperate grassland. Soil Biology and Biochemistry. 37, 1707–1717.
Corré, M., Brumme, R., Veldkamp, E. and Beese, F. O. (2007). Changes in nitrogen cycling and retention processes in soils under spruce forests along a nitrogen enrichment gradient in Germany. Global Change Biology 13, 1509–1527.
Craine, J. M., Morrow, C. and Fierer, N. (2007). Microbial nitrogen limitation increases decomposition. Ecology, 88, 2105–2113.
Cronan, C. S., April, R., Bartlett, R. al. (1989). Aluminum toxicity in forests exposed to acidic deposition: the ALBIOS Results. Water, Air and Soil Pollution, 48, 181–192.
Curtin, D., Steppuhn, H., Campbell, C. A. and Biederbeck, V. O. (1999). Carbon and nitrogen mineralization in soil treated with chloride and phosphate salts. Canadian Journal of Soil Science, 79, 427–429.
Ruiter, P. C., Neutel, A.-M. and Moore, J. C. (1994). Modelling food webs and nutrient cycling in agro-ecosystems. Trends in Ecology and Evolution, 9, 378–383.
Visser, P. H. B., Beier, C., Rasmussen, al. (1994). Biological response of 5 Forest ecosystems in the Exman project to input changes of water, nutrients and atmospheric loads. Forest Ecology and Management, 68, 15–29.
Vries, W. and Breeuwsma, A. (1986). Relative importance of natural and anthropogenic proton sources in soils in the Netherlands. Water, Air and Soil Pollution, 28, 173–184.
Vries, W., Grinsven, J. J. M., Breemen, N., Leeters, E. E. J. M. and Jansen, P. C. (1995). Impacts of acid deposition on concentrations and fluxes of solutes in acid sandy forest soils in the Netherlands. Geoderma, 67, 17–43.
Vries, W., Klap, J. M. and Erisman, J. W. (2000). Effects of environmental stress on forest crown condition in Europe. Part I: Hypotheses and approach to the study. Water, Air and Soil Pollution, 119, 317–333.
Vries, F. T., Hoffland, E., Eekeren, N., Brussaard, L. and Bloem, J. (2006a). Fungal/bacterial ratios in grasslands with contrasting nitrogen management. Soil Biology and Biochemistry, 38, 2092–2103.
Vries, W., Reinds, G. J., Gundersen, P. and Sterba, H. (2006b). The impact of nitrogen deposition on carbon sequestration in European forests and forest soils. Global Change Biology, 12, 1151–1173.
Vries, F. T., Bloem, J., Eekeren, N., Brussaard, L. and Hoffland, E. (2007a). Fungal biomass in pastures increases with age and reduced N input. Soil Biology and Biochemistry, 39, 1620–1630.
Vries, W., Salm, C., Reinds, G. J. and Erisman, J. W. (2007b). Element fluxes through European forest ecosystems and their relationships with stand and site characteristics. Environmental Pollution, 148, 501–513.
Vries, W., Solberg, S., Dobbertin, al. (2008). Ecologically implausible carbon response?Nature, 451, E1–E3.
Vries, W., Solberg, S., Dobbertin, al. (2009). The impact of nitrogen deposition on carbon sequestration by European forests and heathlands. Forest Ecology and Management, 258, 1814–1823.
Vries, W., Leip, A., Reinds, G. J. et al. (2011). Geographic variation in terrestrial nitrogen budgets across Europe. In: The European Nitrogen Assessment, ed. Sutton, M. A., Howard, C. M., Erisman, J. al., Cambridge University Press.
Delgado, M. J., Garrido, J. M., Ligero, F. and Lluch, C. (1993). Nitrogen fixation and carbon metabolism by nodules and bacteroids of pea plants under sodium chloride. Physiologia Plantarum, 89, 824–829.
Diemont, W. H. and Oude Voshaar, J. H. (1994). Effects of climate and management on the productivity of Dutch heathlands. Journal of Applied Ecology, 31, 709–716.
Dise, N. B., Matzner, E. and Forsius, M. (1998). Evaluation of organic horizon C:N ratio as an indicator of nitrate leaching in conifer forests across Europe. Environmental Pollution, 102, 453–456.
Dise, N. B., Ashmore, M., Belyazid, al. (2011). Nitrogen as a threat to European terrestrial biodiversity. In: The European Nitrogen Assessment, ed. Sutton, M. A., Howard, C. M., Erisman, J. al., Cambridge University Press.
Dumortier, M., Butaye, J., Jacquemyn, al. (2002). Predicting vascular plant species richness of fragmented forests in agricultural landscapes in central Belgium. Forest Ecology and Management, 158, 85–102.
Dupouey, J. L., Dambrine, E., Laffite, J. D. and Moares, C. (2002). Irreversible impact of past land use on forest soils and biodiversity. Ecology, 83, 2978–2984.
,EC (2006). Communication from the Commission to the council, the European parliament, the European economic and social committee and the Committee of the Regions. Thematic Strategy for Soil Protection. Brussels. 22.9.2006, COM(2006)231 final and SEC(2006)1165.
Eckelmann, W., Baritz, R., Bialousz, al. (2006). Common Criteria for Risk Area Identification according to Soil Threats, European Soil Bureau Research Report No.20, EUR 22185 EN. Office for Official Publications of the European Communities, Luxembourg.
Edwards, C. A. and Lofty, J. R. (1982). The effect of direct drilling and minimal cultivation on earthworm populations. Journal of Applied Ecology, 19, 723–734.
Erisman, J. W. and Vries, W. (2000). Nitrogen deposition and effects on European forests. Environmental Reviews, 8, 65–93.
Eulenstein, F., Werner, A., Willms, al. (2008). Model based scenario studies to optimize the regional nitrogen balance and reduce leaching of nitrate and sulfate of an agriculturally used water catchment. Nutrient Cycling in Agroecosystems, 82, 33–49.
Evans, C. D., Goodale, C. L., Caporn, S. J. al. (2008). Does elevated nitrogen deposition or ecosystem recovery from acidification drive increased dissolved organic carbon loss from upland soil? A review of evidence from field nitrogen addition experiments. Biogeochemistry, 91, 13–35.
Europe, Fertilizers (2010).
Forge, T. A. and Simard, S. W. (2001). Structure of nematode communities in forest soils of southern British Columbia: relationships to nitrogen mineralization and effects of clearcut harvesting and fertilization. Biology and Fertility of Soils, 34, 170–178.
Forge, T. A., Bittman, S. and Kowalenko, C. G. (2005). Responses of grassland soil nematodes and protozoa to multi-year and single-year applications of dairy manure slurry and fertiliser. Soil Biology and Biochemistry, 37, 1751–1762.
Friedel, J. K., Ehrmann, O., Pfeffer, al. (2008). Soil microbial biomass and activity: the effect of site characteristics in humid temperate forest ecosystems. Journal of Plant Nutrition and Soil Science, 169, 175–184.
Gauci, V., Dise, N. and Blake, S. (2005). Long-term suppression of wetland methane flux following a pulse of simulated acid rain. Geophysical Research Letters, 32, L12804.
Ge, Y., Zhang, J.-B., Zhang, L.-M., Yang, M. and He, J.-Z. (2008). Long-term fertilization regimes affect bacterial community structure and diversity of an agricultural soil in northern China. Journal of Soils and Sediments, 8, 43–50.
Glatzel, G. (1991). The impact of historic land use and modern forestry on nutrient relations of Central European forest ecosystems. Nutrient Cycling in Agroecosystems, 27, 1–8.
Glendining, M. J. and Powlson, D. S. (1995). The effects of long continued applications of inorganic nitrogen fertiliser on soil organic nitrogen – a review. In: Soil Management, Experimental Basis for Sustainability and Environmental Quality, ed. Lal, R., and Stewart, B. A.. CRC Press, Boca Raton, FL, pp. 385–446.
Granli, T. and Bøckman, O. C. (1994). Nitrous oxide from agriculture. Norwegian Journal of Agricultural Sciences Supplement, 12, 7–128.
Gundersen, P., Callesen, I. and Vries, W. (1998). Nitrate leaching in forest ecosystems is related to forest floor C/N ratios. Environmental Pollution, 102, 403–407.
Gundersen, P., Schmidt, I. K. and Raulund-Rasmussen, K. (2006). Leaching of nitrate from temperate forests: effects of air pollution and forest management. Environmental Reviews, 14, 1–57.
Gunnarsson, U., Bronge, L. B., Rydin, H. and Ohlson, M. (2008). Near-zero recent carbon accumulation in a bog with high nitrogen deposition in SW Sweden. Global Change Biology, 14, 2152–2165.
Guo, L. B. and Gifford, R. M. (2002). Soil carbon stocks and land use change: a meta analysis. Global Change Biology, 8, 345–360.
Harmsen, K., Loman, H. and Neeteson, J. J. (1990). A derivation of the Pierre–Sluijsmans equation used in the Netherlands to estimate the acidifying effect of fertilisers applied to agricultural soil. Fertilizer Research, 26, 319–325.
Hartog, N., Griffioen, J. and Bergen, P. F. (2005). Depositional and paleohydrogeological controls on the distribution of organic matter and other reactive reductants in aquifer sediments. Chemical Geology, 216, 113–131.
Haynes, R. (1983). Soil acidification induced by leguminous crops. Grass and Forage Science, 38, 1–11.
Hettelingh, J.-P., Posch, M. and Smet, P. A. M. (2001). Multi-effect critical loads used in multi-pollutant reduction agreements in Europe. Water, Air and Soil Pollution, 130, 1133–1138.
Hofman, G. and Ruymbeke, M. (1980). Evolution of soil humus content and calculation of global humification coeffcients on different organic matter treatments during a 12 year experiment with Belgian silt soils. Soil Science, 129, 92–94.
Högberg, P. (2007). Nitrogen impacts on forest carbon. Nature, 447, 781–782.
Hooper, D. U., Bignell, D. E., Brown, V. al. (2000). Interactions between aboveground and belowground biodiversity in terrestrial ecosystems: patterns, mechanisms, and feedbacks. BioScience, 50, 1049–1061.
Huerta-Diaz, M. A. and Morse, J. W. (1992). Pyritization of trace metals in anoxic marine sediments. Geochimica et Cosmochimica Acta, 56, 2681–2702.
Hyvönen, R., Ågren, G. I., Linder, al. (2007). The likely impact of elevated [CO2], nitrogen deposition, increased temperature, and management on carbon sequestration in temperate and boreal forest ecosystems: a literature review. New Phytologist, 174, 463–480.
Hyvönen, R., Persson, T., Andersson, al. (2008). Impact of long-term nitrogen addition on carbon stocks in trees and soils in northern Europe. Biogeochemistry, 89, 121–137.
,IPCC (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, prepared by the National Greenhouse Gas Inventories Programme. IGES, Japan.
Jangid, K., Williams, M. A., Franzluebbers, A. al. (2008). Relative impacts of land-use, management intensity and fertilization upon soil microbial community structure in agricultural systems. Soil Biology and Biochemistry, 40, 2843–2853.
Johansson, J. F., Paul, L. R. and Finlay, R. D. (2004). Microbial interactions in the mycorrhizosphere and their significance for sustainable agriculture. FEMS Microbiology and Ecology, 48, 1–13.
Jordan, D., Miles, R. J., Hubbard, V. C. and Lorenz, T. (2004). Effect of management practices and cropping systems on earthworm abundance and microbial activity in Sanborn Field: a 115-year-old agricultural field. Pedobiologia, 48, 99–110.
Jørgensen, C. J., Jacobsen, O. S., Elberling, B. and Aamand, J. (2009). Microbial oxidation of pyrite coupled to nitrate reduction in anoxic groundwater sediment. Environmental Science and Technology, 43, 4851–4857.
Karlen, D. L., Mausbach, M. J., Doran, J. al. (1997). Soil quality: a concept, definition, and framework for evaluation. Soil Science Society of America Journal, 61, 4–10.
Kesik, M., Ambus, P., Baritz, al. (2005). Inventories of N2O and NO emissions from European forest soils. Biogeosciences, 2, 353–375.
Khan, S. A., Mulvaney, R. L., Ellsworth, T. R. and Boast, C. W. (2007). The myth of nitrogen fertilization for soil carbon sequestration. Journal of Environmental Quality, 36, 1821–1832.
Kibblewhite, M. G., Ritz, K. and Swift, M. J. (2008). Soil health in agricultural systems. Philosophical Transactions of the Royal Society of London, Series B, Biological Sciences, 363, 685–701.
Kreutzer, K., Butterbach-Bahl, K., Rennenberg, H. and Papen, H. (2009). The complete nitrogen cycle of an N-saturated spruce forest ecosystem. Plant Biology, 11, 643–649.
Lal, R. (2004). Soil carbon sequestration impacts on global climate change and food security. Science, 304, 1623–1627.
Larsen, F. and Postma, D. (1997). Nickel mobilization in a groundwater well field: release by pyrite oxidation and desorption from manganese oxides. Environmental Science and Technology, 31, 2589–2595.
Lavelle, P. and Spain, A. (2001). Soil Ecology. Kluwer Academic Publishers, Dordrecht.
Lavelle, P., Barot, S., Blouin, al. (2007). Earthworms as key actors in self-organized soil systems. In: Ecosystem Engineers: Plants to Protists, ed. Cuddington, K., Byers, J. E., Wilson, W. G. and Hastings, A., Academic Press, London, pp. 405.
Leinweber, P. and Reuter, G. (1992). The influence of different fertilization practices on concentrations of organic carbon and total nitrogen in particle-size fractions during 34 years of a soil formation experiment in loamy marl. Biology and Fertility of Soils, 13, 119–124.
Lesschen, J. P., Eickhout, B., Rienks, W., Prins, A. G. and Staritsky, I. (2009). Greenhouse gas emissions for the EU in four future scenarios, WAB Report 500102 026. PBL, Bilthoven, The Netherlands.
Magnani, F., Mencuccini, M., Borghetti, al. (2007). The human footprint in the carbon cycle of temperate and boreal forests. Nature, 447, 848–850.
Marschner, H. (1995). Mineral Nutrition of Higher Plants, 2nd edition, Academic Press, London.
Matzner, E. and Murach, D. (1995). Soil changes induced by air pollutant deposition and their implication for forests in central Europe. Water, Air and Soil Pollution, 85, 63–76.
Moldanová, J., Grennfelt, P., Jonsson, Å.et al. (2011). Nitrogen as a threat to European air quality. In: The European Nitrogen Assessment, ed. Sutton, M. A., Howard, C. M., J. W. Erisman et al., Cambridge University Press.
Molénat, J., Durand, P., Gascuel-Odoux, C., Davy, P. and Gruau, G. (2002). Mechanisms of nitrate transfer from soil to stream in an agricultural watershed of French Brittany. Water, Air and Soil Pollution, 133, 161–183.
Moncaster, S. J., Bottrell, S. H., Tellam, J. H., Lloyd, J. W. and Konhauser, K. O. (2000). Migration and attenuation of agrochemical pollutants: insights from isotopic analysis of groundwater sulphate. Journal of Contaminant Hydrology, 43, 147–163.
Mulvaney, R. L., Khan, S. A. and Ellsworth, T. R. (2009). Synthetic nitrogen fertilizers deplete soil nitrogen: a global dilema for sustainable cereal production. Journal of Environmental Quality, 38, 2295–2314.
Nemergut, D. R., Townsend, A. R., Sattin, S. al. (2008). The effects of chronic nitrogen fertilization on alpine tundra soil microbial communities: Implications for carbon and nitrogen cycling. Environmental Microbiology, 10, 3093–3105.
Niemeyer, M., Niemeyer, T., Fottner, S., Härdtle, W. and Mohamed, A. (2007). Impact of sod-cutting and choppering on nutrient budgets of dry heathlands. Biological Conservation, 134, 344–353.
,OECD (2010).
Oenema, O. (1990). Calculated rates of soil acidification of intensively used grassland in the Netherlands. Fertilizer Research, 26, 217–228.
Okada, H. and Harada, H. (2007). Effects of tillage and fertiliser on nematode communities in a Japanese soybean field. Applied Soil Ecology, 35, 582–598.
Olesen, J. E., Askegaard, M. and Rasmussen, I. A. (2000). Design of an organic farming crop rotation experiment. Acta Agriculturae Scandinavica, 50, 13–21.
Olsson, P., Linder, S., Giesler, R. and Hogberg, P. (2005). Fertilization of boreal forest reduces both autotrophic and heterotrophic soil respiration. Global Change Biology, 11, 1745–1753.
Otero, N., Torrento, C., Soler, A., Mencio, A. and Mas-Pla, J. (2009). Monitoring groundwater nitrate attenuation in a regional system coupling hydrogeology with multi-isotopic methods: The case of Plana de Vic (Osona, Spain). Agriculture, Ecosystems and Environment, 133, 103–113.
Paustian, K., Collins, H. P. and Paul, E. A. (1997). Management controls on soil carbon. In: Soil Organic Matter in Temperate Agroecosystems, ed. Paul, E. A., Paustian, K., Elliot, E. T. and Cole, C. V., CRC Press, Boca Raton, FL, pp. 15–49.
Persson, H. and Ahlström, K. (1990). The effects of forest liming on fertilization on fine-root growth. Water, Air and Soil Pollution, 54, 365–375.
Phuyal, M., Artz, R. R. E., Sheppard, L., Leith, I. D. and Johnson, D. (2008). Long-term nitrogen deposition increases phosphorus limitation of bryophytes in an ombrotrophic bog. Plant Ecology, 196, 111–121.
Powlson, D. S., Jenkinson, D. S., Johnston, A. al. (2010). Comments on ‘synthetic nitrogen fertilizers deplete soil nitrogen: a global dilemma for sustainable cereal production,’ by Mulvaney, R. L., Khan, S. A., and Ellsworth, T. R.. Journal of Environmental Quality 39, 1–4.
Raubuch, M. and Beese, F. (2005). Influence of soil acidity on depth gradients of microbial biomass in beech forest soils. European Journal of Forest Research, 124, 87–93.
Reinds, G. J., Posch, M. and Leemans, R. (2009). Modelling recovery from soil acidification in European forests under climate change. Science of the Total Environment, 407, 5663–5673.
Rousk, J. and Bååth, E. (2007). Fungal and bacterial growth in soil with plant materials of different C/N ratios. FEMS Microbiology and Ecology, 62, 258–267.
Ruser, R., Schilling, R., Steindl, H., Flessa, H. and Beese, F. (1998). Soil compaction and fertilization effects on nitrous oxide and methane fluxes in potato fields. Soil Science Society of America Journal, 62, 1587–1595.
Schjønning, P., Elmholt, , S. and Christensen, B. T. (2004). Soil quality management: concepts and terms. In: Managing Soil Quality: Challenges in Modern Agriculture, ed. P. Schjønning, Elmholt, S. and Christensen, B. T.. UK, CAB International, Wallingford, pp. 1–12.
Shevtsova, L., Romanenkov, V., Sirotenko, al. (2003). Effect of natural and agricultural factors on long-term soil organic matter dynamics in arable soddy-podzolic soils: modeling and observation. Geoderma, 116, 165–189.
Sieferle, R. P. (2001). The Subterranean Forest: Energy Systems and the Industrial Revolution, The White Horse Press, Cambridge, UK.
Sleutel, S., Neve, S. and Hofman, G. (2003). Estimates of carbon stock changes in Belgian cropland. Soil Use and Management, 19, 166–171.
Smith, P., Andrén, O., Karlsson, al. (2005). Carbon sequestration potential in European croplands has been overestimated. Global Change Biology, 11, 2153–2163.
Smith, P., Martino, D., Cai, al. (2008). Greenhouse gas mitigation in agriculture. Philosophical Transactions of the Royal Society of London, Series B, Biological Sciences, 363, 789–813.
Stevens, C. J., Dise, N. B., Gowing, D. J. G. and Mountford, G. O. (2006). Loss of forb diversity in relation to nitrogen deposition in the UK: regional trends and potential controls. Global Change Biology, 12, 1823–1833.
Streeter, J. (1988). Inhibition of legume nodule formation and N2 fixation by nitrate. CRC Critical Reviews in Plant Sciences, 7.
Swift, M. J., Izac, A.-M. N. and Noordwijk, M. (2004). Biodiversity and ecosystem services in agricultural landscapes: are we asking the right questions?Agriculture, Ecosystems and Environment, 104, 113–134.
Tóth, G., Montanarella, L. and Rusco, E. (2008). Threats to Soil Quality in Europe. European Commission, Joint Research Centre, Institute for Environment and Sustainability.
Trinder, C. J., Johnson, D. and Artz, R. R. E. (2009). Litter type, but not plant cover, regulates initial litter decomposition and fungal community structure in a recolonising cutover peatland. Soil Biology and Biochemistry, 41, 651–655.
Truu, M., Truu, J. and Ivask, M. (2008). Soil microbiological and biochemical properties for assessing the effect of agricultural management practices in Estonian cultivated soils. European Journal of Soil Biology, 44, 231–237.
,UNFCCC (2010).
Breemen, N., Mulder, J. and Driscoll, C. T. (1983). Acidification and alkalinization of soils. Plant and Soil, 75, 283–308.
Akker, J. J. H., Arvidsson, J. and Horn, R. (2003). Introduction to the special issue on experiences with the impact and prevention of subsoil compaction in the European Union. Soil and Tillage Research, 73, 1–8.
Wal, A., Geerts, R. H. E. M., Korevaar, al. (2009). Dissimilar response of plant and soil biota communities to long-term nutrient addition in grasslands. Biology and Fertility of Soils, 45, 663–667.
Eekeren, N., Bommelé, L., Bloem, al. (2008). Soil biological quality after 36 years of ley-arable cropping, permanent grassland and permanent arable cropping. Applied Soil Ecology, 40, 432–446.
Groenigen, K. J., Six, J., Harris, D. and Kessel, C. (2007). Elevated CO2 does not favor a fungal decomposition pathway. Soil Biology and Biochemistry, 39, 2168–2172.
Velthof, G. L., Beek, C. G. E. M. and Erp, P. J. (1999). Leaching of calcium and magnesium (hardness) from arable land and maize land on non-calcareous sandy soils. Meststoffen, 1999, 60–66.
Velthof, G. L., Kuikman, P. J. and Oenema, O. (2002). Nitrous oxide emission from soils amended with crop residues. Nutrient Cycling in Agroecosystems, 62, 249–261.
Velthof, G. L., Oudendag, D. A., Witzke, H. al. (2009). Integrated assessment of nitrogen emission losses from agriculture in EU-27 using MITERRA-EUROPE. Journal of Environmental Quality, 38, 1–16.
Vitousek, J. P. W., Aber, J. D., Howarth, R. al. (1997). Human alteration of the global nitrogen cycle: sources and consequences. Ecological Applications, 7, 737–750.
Oheim, G., Hardtle, W., Naumann, P. al. (2008). Long-term effects of historical heathland farming on soil properties of forest ecosystems. Forest Ecology and Management, 255, 1984–1993.
Wardle, D. A., Bardgett, R. D., Klironomos, J. al. (2004). Ecological linkages between aboveground and belowground biota. Science, 304, 1629–1633.
Wolf, R. J. A. M., Dimmers, W. J., Hommel, P. W. F. al. (2006). Bekalking en toevoegen van nutriënten Evaluatie van de effecten op het bosecosysteem – een veldonderzoek naar vegetatie, humus en bodemfauna. Alterra, Wageningen, The Netherlands.
Xu, G. L., Schleppi, P., Li, M. H. and Fu., S. L. (2009). Negative responses of Collembola in a forest soil (Aptal, Switzerland) under experimentally increased N deposition. Environmental Pollution, 157, 2030–2036.