Abstract
The nitrogen cycle of terrestrial plant-dominated ecosystems is explained by means of a compartment model. Its main parts are described: the plant-internal cycle, the ecosystem-internal cycle and the global N-cycle, including input-output relations and biological N-fixation. The distribution of total nitrogen (N t ) as well as the net mineralization of nitrogen in the soils of a dune succession on Spiekeroog Island (Germany) are described. Values for 13 different sites are given, ranging from foredunes to climax dune forests in a chronosequence from 0 to > 250 years. In the course of development, the N-pools in the soils increase from approximately 150 kg to more than 3000 kg N t . ha −1 . 30 cm −1
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