5 years ago

The Green Belt as a European Ecological Network strengths and gaps

The Green Belt as a European Ecological Network strengths and gaps

Schlumprecht, H., Laube,

Schlumprecht, H., Laube, J. MONITORING BIODIVERSITY OF THE THURINGIAN GREEN BELT proposals were combined to a comprehensive proposal for the total monitoring area. For the valuable biotope types, the main recommendation was “continuity of current land use” (mainly traditional grazing, or mowing) on a total of 83.3 ha, followed by the removal of threats (very often clearing of shrubbery; on a total of 47.0 ha). The reintroduction of extensive land use (e.g. grazing or mowing) were recommended on 22.6 ha and the extensification of current land use was recommended for about 4.3 ha, see following table. Table 2: Management proposals given for valuable biotope types Management recommendations Urgency 1 (within 1-2 years) 38 Urgency 2 (within 3-5 years) Urgency 3 (>6 years) Sum maintaining current land use or management 80.0 3.2 83.3 Reintroduction of extensive land use 10.6 12.0 22.6 No management action necessary 9.4 1.4 10.7 Extensification of land use 4.3 4.3 Removal of impairments 21.4 25.1 0.5 47.0 Sum (ha) 125.7 40.3 1.9 167.9 2.1.5 Plant species inventory The species lists containing both characteristic and threatened species was used to evaluate plant species inventories from A (very good species inventory, including a broad number of biotope-typical species as well as rare species) to C (species inventory lacking typical species, rare species missing). 15.9 ha of valuable biotope types were rated as of outstanding value (A), further 79.6 ha were rated as in good conditions (B). The remaining 30.4 ha were rated as in moderate to poor conditions (C). On average 1.9 rare species occur per monitoring area (regarding the Thuringian Red List (2011) [7], Red List Germany (1996) [8] and species protected by law). In total 10 endangered plant species of the Red List Thuringia (2011) were recorded at the monitoring areas (numbers in brackets gives number of monitoring sites): Arnica montana (1), Barbarea stricta (1), Carex flava (1), Lathyrus nissolia (4), Melampyrum cristatum (3), Petrorhagia prolifera (1), Stachys germanica (1), Tephroseris helenitis ssp. helenitis (1), Trifolium spadiceum (2), and Vaccinium uliginosum ssp. uliginosum (1). Additionally, 31 plant species are categorised as “vulnerable” according the Red List Thuringia (2011). 2.1.6 Plant species richness The average number of characteristic species was 20.3 species per monitoring area, with a standard variance of 12.7 species (median 18). The values range from 1 characteristic plant species (on MID 9) to 56 species (MID 15). The areas with highest numbers of rare species (i.e. plant species of the Red List Thuringia 2011, of Germany 1996 or protected plants by nature conservation law) are four oligotrophic grassland monitoring areas (2 of them with 9, 2 with 5 rare plant species). On average two rare plant species occur per monitoring area (1.3 species with reference only to the Red List of Thuringia). Melampyrum arvense (occurring at 15 biotopes) and the orchid Gymnadenia conopsea (10 biotopes) were most frequent.

Schlumprecht, H., Laube, J. MONITORING BIODIVERSITY OF THE THURINGIAN GREEN BELT Centaurium erythraea and Thalictrum aquilegifolium were found at 5 sites. The majority of threatened or legally protected plant species were only found once or twice. Area, in hectares Number of species 12 10 8 6 4 2 0 C: bad B: good A: very good Evaluation 1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930 Monitoring ‐ID Figure 4: Evaluation of the ecological conditions of the monitoring areas. 10 9 8 7 6 5 4 3 2 1 0 Threatened or protected plant species of Thuringia Number in Red List or protected Number only in Red List 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 39 Monitoring site Figure 5: Threatened and protected plant species of the monitoring areas

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