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The Alnus-problem and the exceedance of critical loads for nitrogen in the Alps
Third-party funded project
Project title The Alnus-problem and the exceedance of critical loads for nitrogen in the Alps
Principal Investigator(s) Körner, Christian
Co-Investigator(s) Hiltbrunner, Erika
Project Members Bühlmann, Tobias
Organisation / Research unit Departement Umweltwissenschaften / Pflanzenökologie (Körner)
Project start 01.01.2011
Probable end 31.12.2014
Status Completed

Large areas of abandoned pasture land in the Alps are currently encroached by shrub at a breathtaking speed, with green alder (Alnus viridis) playing the most prominent role. Dense Alnus thickets reduce plant diversity in former species-rich upper montane grassland, pre­vent natural forest succession, change the water relations at the landscape scale by reduc­ing runoff, contribute through symbiotic N2 fixation substantially to eutrophication by leaching nitrate to the river system and exert risks to local drinking water springs. Paradoxically, this conversion into species-poor, nitrogen enriching and releasing Alnus thickets occurs in mountain regions considered particularly rich in biodiversity and essential for the continuing provision of many ecosystem goods and services, particularly for clean and plentiful water. Except from local sources, critical loads for nitrogen by atmospheric deposition are only rarely exceeded in these high elevation regions.

The project ALNEX is designed (1) to quantify the water quality impact of Alnus by measur­ing the nitrogen pools and fluxes from single alder shrub to catchment-wide landscapes, (2) to elaborate land management guidelines towards preserving of open, centuries-old pasture land and (3) to assess the policy implications in a critical load and biodiversity context.

Keywords Alnus, nitrogen, Alps, pasture land
Financed by Foundations and Associations

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