Long-term behaviour of 15N in an alpine grassland ecosystem

Martin Gerzabek , Georg Haberhauer, Michael Stemmer, Sabine Klepsch, Ernst Haunold

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung


Nitrogen dynamics in semi-natural environments is crucial for the development and ecological stability of these systems. The present paper shows the results of the reinvestigation of a 15N-tracer experiment, which was established in the Grossglockner massif in Austria at 2300ma.s.l. in 1974=1975. We show that large quantities of nitrogen introduced by a single pulse labelling (amounting to approximately 1.7% of the nitrogen in the system) into an alpine grassland remain in the soil-plant system, with only 55% being lost during 27-28 years. In the first 10 cm of the four investigated soil profiles 40% of 15N was recovered, being mainly bound in organic forms. A simple site specific model was established on the basis of the results considering a biological, residual and labile N-pool, the latter being the source for N-losses. By the model a long mean residence time close to 100 years was derived for the remaining 15N.
Seiten (von - bis)1-11
PublikationsstatusVeröffentlicht - 2003

Research Field

  • Nicht definiert


  • Alpine grassland
  • Cambisol
  • 15N
  • N dynamics
  • N-pools


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