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Dynamic soil acidification modeling in Switzerland. Partners: Mattias Alveteg, Harald Sverdrup and Per Warfvinge from Lund University, Sweden; Rolf Becker and Hans-Dieter Nagel from Ökodata, Germany;

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dynamic soil acidification modeling in switzerland
Dynamic soil acidification modeling in Switzerland

Partners:

  • Mattias Alveteg, Harald Sverdrup and Per Warfvinge from Lund University, Sweden;
  • Rolf Becker and Hans-Dieter Nagel from Ökodata, Germany;
  • Peter Brassel, Edgar Kaufmann, Peter Blaser and Stefan Zimmermann from the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL);
  • Beat Rihm from Meteotest, Switzerland;
  • Sabine Braun from the Institute for Applied Plant Biology, Switzerland;

The studies in Switzerland are coordinated and financed by the Swiss Agency for the Environment, Forests and Landscape (SAEFL) repre-sented by Beat Achermann and Richard Volz.

outline
Outline
  • Regional SAFE
  • National results
  • Scenario analysis results
  • Outlook

In Switzerland, SAFE was applied

  • to the major rooting zone (the first 40 to 60 cm divided into 4 layers)
  • of 600 forest sites on intersections of a regular 4 x 4 km grid (National Forest Inventory),
  • using a simulation period of 250 years,
  • future acidifying deposition as to be expected from the implementation of the Gothenburg Protocol (GP99)
  • and future roundwood removal according to the European Timber Trend studies (ETTS_V).
data reduction
Data reduction
  • Removal of the depth-information by taking minimum, maximum or weighted parameter values (from 4 values to 1 value per site and year);
  • Removal of the spatial information by
    • calculating cumulative distribution functions and selected per-centile values for every year (from 600 values to e.g. 7 values per year). Plots of selected percentiles (5, 10, 25, 50, 75, 90 and 95) versus time;
    • comparing the parameter values with an agreed critical limit and calculating the percentage of sites violating this threshold (from 600 values to 1 value per year). Plots of the percentage of sites violating the threshold versus time.
outlook topics to be cleared
Outlook - Topics to be cleared
  • It is not clear yet, whether and how dynamic model results can be used in integrated assessment modeling and there is no agreement on deliverables yet;
  • Regarding the Convention, it looks like we still need both steady-state and dynamic modeling. Consequently, compatibility of steady-state and dynamic modeling (of acidification) regarding technicalities as well as input data becomes an issue;
  • With nitrogen becoming the dominant (acidifying and eutrophying) air pollutant, there is a need for better integration of nitrogen dynamics in dynamic models.