Community Research and Development Information Service - CORDIS


The NITREX project investigates the role of nitrate and ammonium in acidification of coniferous forest ecosystems across a pollution gradient in northern and central Europe. Nitrogen deposition is experimentally changed to entire forest ecosystems at seven sites; nitrogen addition at sites of relatively low present-day deposition and nitrogen removal by roofs at sites with high present-day deposition. Ecosystem input-output budgets and each of the major components of the ecosystem are investigated (water, soil, vegetation, fauna) and integrated at two levels: (i) by studying the transfer of nitrogen within the entire ecosystem by means of 15N tracer studies and nitrogen cycling models; (ii) by studying the response to treatments among the same components in different ecosystems in the network (cross-site comparisons). The first phase of NITREX (1991-93) involves 12 research institutions in 6 nations. The individual sites and investigations in NITREX are described and preliminary results to date are summarised.

Additional information

Authors: DISE N B, Norwegian Institute for Water Research, Oslo (NO);WRIGHT R F (EDITORS), Norwegian Institute for Water Research, Oslo (NO)
Bibliographic Reference: EUR 14319 EN (1991) 102 pp.
Availability: Available from P Mathy, CEC, DG XII, 200 rue de la Loi, B-1049 Bruxelles (BE)
ISBN: ISBN 2-87263-077-5
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