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https://doi.org/10.21256/zhaw-22875| Publication type: | Bachelor thesis |
| Title: | Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura |
| Authors: | Charmillot, Kévin |
| Advisors / Reviewers: | Dengler, Jürgen Babbi, Manuel |
| DOI: | 10.21256/zhaw-22875 |
| Extent: | 27 |
| Issue Date: | 2021 |
| Publisher / Ed. Institution: | ZHAW Zürcher Hochschule für Angewandte Wissenschaften |
| Publisher / Ed. Institution: | Winterthur |
| Language: | German |
| Subjects: | Halbtrockenrasen; Vegetationsveränderung; Wiederaufnahme; Ökologische Zeigerwerte; Eutrophierung; Biodiversität; Funktionelle Merkmale |
| Subject (DDC): | 333.7: Land, natural recreational areas 577: Ecology |
| Abstract: | Semi‐dry grasslands have declined sharply in Western Europe in the last century. These most speciesrich habitats are threatened due to intensification of agriculture, eutrophication, dereliction, climate change and landscape fragmentation. As a result, the vegetation of semi‐dry grasslands is changing and shows a trend towards homogenization. Specialized species are particularly endangered because their growth conditions are no longer met due to eutrophication and fragmentation. However, only a few studies have so far found that nutrient enrichment also leads to a decline in the species richness. Especially in the calcareous region of the Swiss Jura, the state of knowledge regarding the impact of eutrophication on semi‐dry grasslands is still poor. By performing a resurvey, it has been investigated whether the vegetation change in this region is in line with the general trend in Western Europe. Abundance, species diversity, 11 different ecological indicator, four functional traits, diagnostic species were analyzed. A habitat classification and decentered correspondence analysis were also performed. Species diversity, light availability, temperature, seed dispersal by animals and seed persistence are all ecological indicator values that have significantly decreased in 2020. Conversely, nutrient availability, soil moisture, seed mass, specific leaf area and canopy height have increased. There are significantly fewer ruderal species, stress‐tolerant species, therophytes and herbaceous chamaephytes in 2020. Highly competitive species and hemicryptophytes, on the contrary, have increased. The general observation shows an increase in productivity and is due to eutrophication of the sites. There are fewer specialized species than in 1984, indicating a homogenization of the vegetation composition, which is shifting towards nutrient‐rich pasture and meadows. A slight increase of the vegetation of the mesophilous herbaceous shrub was also observed. This shift towards their natural successional stage and the eutrophication shows that agricultural management is not optimally carried out. Most of these sites are still not supported by any conservation program. The fact that the results slightly differ from the general trend in Western Europe is also an indication of the importance of promoting regionally targeted conservation strategy in order to stop biodiversity loss in semi‐dry grasslands. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/22875 |
| License (according to publishing contract): | CC BY 4.0: Attribution 4.0 International |
| Departement: | Life Sciences and Facility Management |
| Appears in collections: | Bachelorarbeiten Umweltingenieurwesen |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2021_Charmillot_Kévin_BA_UI.pdf | 4.94 MB | Adobe PDF |  View/Open |
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Charmillot, K. (2021). Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura [Bachelor’s thesis, ZHAW Zürcher Hochschule für Angewandte Wissenschaften]. https://doi.org/10.21256/zhaw-22875
Charmillot, K. (2021) Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura. Bachelor’s thesis. ZHAW Zürcher Hochschule für Angewandte Wissenschaften. Available at: https://doi.org/10.21256/zhaw-22875.
K. Charmillot, “Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura,” Bachelor’s thesis, ZHAW Zürcher Hochschule für Angewandte Wissenschaften, Winterthur, 2021. doi: 10.21256/zhaw-22875.
CHARMILLOT, Kévin, 2021. Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura. Bachelor’s thesis. Winterthur: ZHAW Zürcher Hochschule für Angewandte Wissenschaften
Charmillot, Kévin. 2021. “Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura.” Bachelor’s thesis, Winterthur: ZHAW Zürcher Hochschule für Angewandte Wissenschaften. https://doi.org/10.21256/zhaw-22875.
Charmillot, Kévin. Vegetationsveränderung in kalkreichen Halbtrockenrasen im Schweizer Jura. ZHAW Zürcher Hochschule für Angewandte Wissenschaften, 2021, https://doi.org/10.21256/zhaw-22875.
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