• Ambus P, Jensen JM, Priemé A, Pilegaard K, Kjøller A. 2001. Assessment of CH4 and N2O fluxes in a Danish beech (Fagus sylvatica) forest and an adjacent N-fertilised barley (Hordeum vulgare) field: effects of sewage sludge amendments. Nutrient Cycling in Agroecosystems 60: 1521.
  • Azam F, Müller C, Weiske A, Benckiser G, Ottow JCG. 2002. Nitrification and denitrification as sources of atmospheric nitrous oxide – role of oxidizable carbon and applied nitrogen. Biology and Fertility of Soils 35: 5461.
  • Beier C, Rasmussen L, Pilegaard K, Ambus P, Mikkelsen T, Jensen NO, Kjöller A, Prieme A, Ladekarl UL. 2001. Fluxes of NO3, NH4+, NO, NO2, and N2O in an old Danish beech forest. Water, Air and Soil Pollution: Focus 1: 187195.
  • Bussotti F, Pancrazi M, Matteucci G, Gerosa G. 2005. Leaf morphology and chemistry in Fagus sylvatica (beech) trees as affected by site factors and ozone: results from CONECOFOR permanent monitoring plots in Italy. Tree Physiology 25: 211219.
  • Butterbach-Bahl K, Gasche R, Breuer L, Papen H. 1997. Fluxes of NO and N2O from temperate forest soils: impact of forest type, N deposition and of liming on the NO and N2O emissions. Nutrient Cycling in Agroecosystems 48: 7990.
  • Butterbach-Bahl K, Gasche R, Willibald G, Papen H. 2002. Exchange of N-gases at the Höglwald Forest – A summary. Plant and Soil 240: 117123.
  • Chang C, Janzen HH, Cho CM, Nakonechny EM. 1998. Nitrous oxide emission via plant transpiration. Soil Science Society of American Journal 62: 3538.
  • Chen X, Cabrera ML, Zhang L, Wu J, Shi YYuWT, Shen SM. 2002. Nitrous oxide emission from upland crops and crop-soil systems in northeastern China. Nutrient Cycling in Agroecosystems 62: 241247.
  • Formánek P, Ambus P. 2004. Assessing the use of δ13C natural abundance in separation of root and microbial respiration in a Danish beech (Fagus sylvatica L.) forest. Rapid Communications in Mass Spectrometry 18: 16.
  • Hakata M, Takahashi M, Zumft W, Sakamoto A, Morikawa H. 2003. Conversion of the nitrate nitrogen and nitrogen dioxide to nitrous oxide in plants. Acta Biotechnologica 23: 249257.
  • Heincke M, Kaupenjohann M. 1999. Effects of soil solution on the dynamics of N2O emissions: a review. Nutrient Cycling in Agroecosystems 55: 133157.
  • IPCC. 2001. Climate Change 2001: Scientific Basis. Contribution of the Working group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK: Cambridge University Press.
  • Kroeze C, Mosier A, Bouwman L. 1999. Closing the global N2O budget: a retrospective analysis 1500–1994. Global Biogeochemical Cycles 13: 18.
  • Müller C. 2003. Plants affect the in situ N2O emissions of a temperate grassland ecosystem. Short Communication. Journal of Plant Nutrition and Soil Science 166: 771773.
  • Papen H, Butterbach-Bahl K. 1999. A 3-year continuous record of nitrogen trace gas fluxes from untreated and limed soil of a N-saturated spruce and beech forest ecosystem in Germany. Journal of Geophysical Research 104: 1848718503.
  • Pilegaard K, Mikkelsen TN, Beier C, Jensen NO, Ambus P, Ro-Poulsen H. 2003. Field measurements of atmosphere–biosphere interactions in a Danish beech forest. Boreal Environment Research 8: 315333.
  • Rusch H, Rennenberg H. 1998. Black Alder (Alnus glutinosa (L.) Gaertn.) trees mediate methane and nitrous oxide emission from the soil to the atmosphere. Plant and Soil 201: 17.
  • Smart DR, Bloom AJ. 2001. Wheat leaves emit nitrous oxide during nitrate assimilation. Proceedings of the National Academy of Sciences, USA 98: 78757878.
  • Tiedje JM. 1982. Denitrification. In: PageAL, MillerRH, KeeneyDR, eds. Methods of Soil Analysis, Part 2, Chemical and Microbiological Properties. Agronomy no. 9. Madison, WI, USA: ASA & SSSA, 10111026.
  • Yan X, Du Shi SL, Xing G. 2000. Pathways of N2O emission from rice paddy soil. Soil Biology and Biochemistry 32: 437440.
  • Zou J, Huang Y, Sun W, Zheng X, Wang Y. 2005. Contribution of plants to N2O emissions in soil-winter wheat ecosystem: pot and field experiments. Plant & Soil 269: 205211.