Vilka trädarter kan inom 50 år bli invasiva i svenska städer?
Our cities are growing more and more, people are moving in and the in the cities congestion is getting bigger (Boverket 2019). Buildings in combination with vehicle traffic and congestion affect air quality (Gustafsson et al. 2014). Research shows that trees, through their ecosystem services, ca...
| Autor principal: | |
|---|---|
| Formato: | First cycle, G2E |
| Lenguaje: | sueco sueco |
| Publicado: |
2021
|
| Materias: | |
| Acceso en línea: | https://stud.epsilon.slu.se/16555/ |
| Sumario: | Our cities are growing more and more, people are moving in and the in
the cities congestion is getting bigger (Boverket 2019). Buildings in
combination with vehicle traffic and congestion affect air quality
(Gustafsson et al. 2014). Research shows that trees, through their
ecosystem services, can improve air quality and also affect temperature
through these services and counteract the problems with poor air quality
and dust particles (Dobbs et al. 2011; Gómez-Baggethun and Barton
2012). Alongside this, climate change is underway and the tree species we
today and previously used in urban environments will find it more
difficult to cope with the new conditions that come with climate change
(Sjöman et al. 2016). It is not only the elevated temperature that causes
problems for the city trees. Pests also increase with a warmer climate
(Moraal and Jagers Op Akkerhuis 2011), and if you look at, for example,
which trees are affected today, among others Aesculus hippocastanum -
horse chestnut suffering from Pseudoonas syringae pv. aesculi – bleeding
canker and Fraxinus exelsior - ash, afflicted by the ash dieback caused by
the fungus Chalara fraxinea (Sjöman and Slagstedt 2015).
The solution to this is to use exotic tree species to get a greater species
diversity of trees in our Swedish cities so that pests should not spread as
quickly as they would have done in a more monocultural population of
trees (Sjöman et al. 2012). The problem is that some exotic tree species
have become invasive in other countries, creating problems for the native
ecosystems. Here in Sweden, this has posed problems, so far with only
one species of Ailanthus altissima - god trees (County Administrative
Board, Skåne 2019). Several sources warn of other tree species that have
become invasive in various places in Europe. This, when Sweden is
expected to have as many other places, a warmer climate, which means
that the species that are invasive in Europe may also become invasive in
Sweden.
In the conclusion of this work, the final forecast is presented for which
tree species may become invasive in Sweden's three largest cities
Stockholm, Göteborg and Malmö with data from, different articles
considering invasive species, the species database (artdatabanken)
(Strand et al. 2018). |
|---|