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Investigations on nitrate reduction of Fraxinus excelsior L. and Quercus robur L. under different nitrogen supply conditions

Funding: DFG Ge 565/2-1, Ge 565/2-2, Ge 565/2-3

From 05/1989 to 10/1996

Principal Investigator: Gerhard Gebauer
Staff: Jutta Stadler, Christoph May

Within the framework of the DFG-SPP "Physiology of Trees", the investigations are intended to contribute to clarifying the question of the localization of the predominant nitrate reduction (shoot or root reduction) in trees. For this purpose, the location of the predominant nitrate reduction in two native tree species (ash and oak) will be localized depending on the different quantity (different levels of nitrate supply) and quality (pure nitrate nutrition or mixed nutrition of nitrate and ammonium) of the nitrogen supply.

List of publications of this Project

•  Gebauer, G; Zeller, B; Schmidt, G; May, C; Buchmann, N; Colin-Belgrand, M; Dambrine, E; Martin, F; Schulze, ED; Bottner, P: The fate of 15N-labelled nitrogen inputs to coniferous and broadleaf forests. in E.-D. Schulze: Ecological Studies No. 142, Carbon and Nitrogen Cycling in European Forest Ecosystems, Springer, 144-170 (2000)
•  Gebauer, G; Schulze, ED: Nitrate nutrition of Central European forest trees. in Rennenberg,H; Eschrich,W; Ziegler,H (eds.): Trees - Contributions to Modern Tree Physiology, Backhuys Publishers, Leyden, 273-291 (1997)
•  Stadler, J; Gebauer, G; Schulze, ED: The influence of ammonium on nitrate uptake and assimilation in 2-year-old ash and oak trees - a tracer study with 15N, Isotopes Environm. Health Studies, 29, 85-92 (1993), doi:10.1080/10256019308046139
•  Stadler, J; Gebauer, G: Nitrate reduction and nitrate content in ash trees (Fraxinus excelsior L.): Distribution between compartments, site comparison and seasonal variation, Trees, 6, 236-240 (1992), doi:10.1007/BF00224342
•  Gebauer, G; Stadler, J: Nitrate assimilation and nitrate content in different organs of ash trees (Fraxinus excelsior>/i>). in M.L. van Beusichem: Plant Nutrition - Physiology and Applications, Kluwer, Dordrecht, 101-106 (1990)

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