Browsing by Subject "Vegetationsaufnahme"

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Die Makrophyten-Vegetation ausgesuchter Fließgewässer des Vorarlberger Rheintals als Grundlage für die Bewertung des ökologischen Zustands
(2005) Jäger, Dietmar; Kohler, Alexander
During the 2002 and 2003 growing seasons, total macrophyte growth was thoroughly investigated in 24 selected stretches of running water in the Vorarlberg Rhine valley over a near-continuous distance of 75 km. Quantities of each species were recorded using the KOHLER evaluation method (KOHLER 1978; KOHLER & JANAUER 1995) in a total of 461 sections of running water and quantitative parameters for macrophyte vegetation were determined using the method defined by the authors JANAUER et al. (1993), KOHLER & JANAUER (1995) und PALL & JANAUER (1995). objectives of this study: 1. Recording of the macrophyte population in selected stretches of running water in the Vorarlberg Rhine valley, and the representation of distribution models for each stretch of water investigated 2. Observation and evaluation of relationships between the occurrence of individual species and relevant site factors in the area investigated, based upon data from the literature 3. Investigation of the indicator potential of macrophytes in the area investigated for specific pollution sources 4. Characteristic definition of running waters on the basis of floristic and ecological factors 5. Proposed regional model species for water restoration 6. Evaluation of the regional threat to individual species