Real semi-arid grass

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The real semi- arid lawn is a mapping unit within the framework of the Swiss nature conservation project “Dry meadows and pastures of national importance”, abbreviated to TWW.

Plant communities of semi-dry grasslands ( plant sociologically the association Mesobromion) were first described in 1938 by Braun-Blanquet and Moor as an independent association between the fat meadows and the real dry grasslands , they are a variant of the limestone grasslands . These are meadows that are mostly wood-free due to grazing or mowing, species-rich meadows on nutrient-poor soils. Character types are seed sasparsette ( Onobrychis viciifolia ), stemless thistle ( Cirsium acaule ), bulbous buttercup ( Ranunculus bulbosus ), creeping grouse ( Ononis repens ), orchids ( Orchis morio ) and other orchids. In general, a distinction is made within the association between meadows (Onobrychido-Brometum, Mesobrometum) and pastures (Carlino-Brometum, Gentiano-Koelerietum).

The mapping unit of real semi-arid lawns is, within the scope of the mapping instructions for finer gradations in the transition from dry, lean to nutrient-rich vegetation types, somewhat narrower than the mesobromion in some literature and at most has a very weak presence of fatty meadow species. Often dominated by grasses such as the Upright brome ( Bromus erectus ) or Brachypodium pinnatum ( Brachypodium pinnatum ) extend their stems far beyond the rather low-growing vegetation layer. Most of the stocks are herbaceous and colorful. This type of meadow is widespread in Switzerland, but is already very rare in the Central Plateau and the Northern Alps. In the lowlands, semi-arid grasslands are often displaced by intensified agriculture.

The following list of species (unit 7.3.3, vegetation group “MB”, species group “MB1” in the mapping instructions by Eggenberg et al.) Includes the typical semi-arid grass species in Switzerland

Only when the Upright brome ( Bromus erectus ) at least 5% of the area covers the types of species group "MB2" are added:

swell

literature

  • Delarze et al. 1999: Mesobromion (4.2.4)
  • Ellenberg 1996: Mesobromion (5,322)
  • Oberdorfer 1978: Mesobromion erecti
  • Mucina et al. 1993: Bromion erecti
  • Corine: Mesobromion (34,322)

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