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Temporal and spatial variability of the vegetation in a four-year
exclosure experiment in Val Trupchun (Swiss National Park)
Martin Camenisch1, Martin Schütz21Camenisch & Zahner, Giacomettistrasse 119, CH-7000 Chur, Switzerland2Swiss Federal Research Institute WSL, CH-8903 Birmensdorf, Switzerland AbstractThe objective of the exclusion experiment, started in 1992, is to document the spatial and temporal variability of the vegetation in Val Trupchun (Swiss National Park), taking into account the impact of large ungulates. The first four recordings of relevés from a total of 15 study sites, each consisting of an exclosure and a control, were carried out from 1992 to 1995. Five permanent plots each were set up per exclosure and per control, i.e. five spatial replicates exist.Between 1992 and 1995, an overall increase in the number of plant species sampled in the 15 study sites was observed, as well as some trends in the vegetation at several sites, i.e. the temporal variability of the vegetation was similarly directed in the spatial replicates. However, these apparent trends are always smaller than natural spatial variability of the vegetation between spatial relevé replicates. The number of plots where tree regeneration was observed also increased during the four years of study. No divergent trends could be found between exclosures and controls, in terms of species richness, species composition, or tree regeneration. Preface | abstract 1 | abstract 2 | abstract 3 | abstract 4 | abstract 5 | abstract 6 | abstract 7 | abstract 8 | abstract 9 | abstract 10 | abstract 11 |