Land-use impact on plant communities in semi-natural sub-alpine grasslands of Budalen, central Norway

摘要: Sub-alpine, semi-natural grasslands induced by mountain summer farming in Budalen, central Norway, can be divided into two main habitats: small enclosures at each farm site, and the pastures surrounding them. Enclosures are exposed to different land-use regimes including grazing, mowing, fertilisation soil disturbance. Pastures have never been fertilised or ploughed current grazing pressure is moderate. All investigated former haymaking areas. Higher conservation values of compared reflected both patterns species richness occurrence vulnerable species. related lower nutrient levels, loss ignition soil, higher levels pH. Vulnerable concentrated species-rich pastures, low local abundance regional distribution. reflect a complexity land-use, were effects fertilising ploughing on plant community could not separated. Tree shrub common habitats, indicate successional invasion woody Maintenance land-uses that created long term perspective (grazing, cutting trees shrubs, mowing) necessary prevent forest succession, prerequisite for future sub-alpine, grasslands.