Persönlicher Status und Werkzeuge

Sprachwahl

Naturwald- und Biodiversitätsforschung / Forest Research:

Processes determining biodiversity in both managed and unmanaged forest stands analysed in the Bavarian Forest, Germany (1999-2002):

Philipp Mayer

In this study important processes determining the compositional biodiversity of forest stands are investigated. The central goal is to find out the mechanisms leading to a certain biodiversity after natural and management disturbances. In the national park "Bayerischer Wald" experimental plots in forest stands with different disturbance regime are selected:

  • untouched for a long time
  • Norway Spruce killed by bark beetle
  • single tree selection silviculture
  • clearcut on small areas (up to 1 ha)

Three important organismic groups are under study: beetles, fungi and plants. The first group is investigated by the Chair of Applied Zoology, the second by the Division of Systematic Botany. In the teaching unit Geobotany the effect of small scale soil disturbances on diversity of the ground vegetation is examined. Experimental plots of 0,5 m² are digged up and the reaction of the vegetation is monitored for two years. Exposed mineral soil is a favourable site for germination and establishment for many species of the species pool. Thus soil disturbances may have a positive effect on species richness.

The soil seed bank plays an important role for vegetation regeneration after disturbance. Therefore soil samples are taken and cultivated in a greenhouse. It is hypothesised that the soil seed bank is richer in seed and species number in managed forests than in those forests without direct human influence. To monitor seed rain we expose seed traps in the summer season. Light is an important trigger for the germination of species. Linking the reaction to soil disturbances under different light conditions to the biodiversity of the community helps to widen our understanding of the effect of disturbance regime on biological diversity. The comparison of unmanaged to managed forests enables us to contribute important aspects to the discussion on the effect of forest management on biological diversity.

Standortskarte des Nationalparks Berchtesgaden (1999-2001):

Volkmar Konnert

The goal of the project is to establish a site map of the Berchtesgaden Nationalpark on the basis of existing information and maps. The following information has to be integrated into the site map: soil, vegetation, geologic and geomorphic maps as well as existing climatic data from the weather stations in the park as well as weather information from the German and Austrian weather service as well as from forest-inventory data gathered in 1983/84 and 1995/97. During the first year of the project the existing information was checked, links between existing data established and plausibility checks tested and documented. Where necessary checks were made on the original data and corrections made.

Subsequently the soil types were classified according to substrate groups and the necessary climatic parameters from the nationalpark weather stations compiled and as available, integrated into the soil information over the area of the park. Further climatic parameters still need to be analyzed and be integrated into the map. Combining the soil map with the vegetation map or the forest inventory map of the nationalpark brought large discrepancies with the geometry of the soils map to light. In order to bring out a meaningful interface between the existing information and the soils map considerable refitting of the data must be carried out. Since this time consuming work was not expected at the beginning of the project, the project has been extended for 4 months in agreement with the administration of the Nationalpark Berchtesgaden.