Non-Native Trees QUIZ

In six chapters, two virtual field trips, 11 reading sections, and 13 lecture units, the team of the ALPTREES project gave you the opportunity to deepen your knowledge about non-native tree species in the Alpine Space. Not all aspects of dendrology, NNT management, invasiveness, climate change adaptation & mitigation, citizen science, urban green space planning, or tree health will now be clear. Some topics will even raise new questions and encourage you to seek more information or even to contact the experts of the ALPTREES team directly. Nevertheless, with this online course on non-native trees, we tended to raise your awareness to the understanding of the responsible use of non-native trees for climate change adaptation of European forests and urban areas requires cross-sectoral and transnational cooperation to secure the biodiversity, ecosystem services, and cultural resources of native forests against the risks of NNT. Above all, we hope to have shared the fascination for trees in the Alpine Space with you!

Finally, we invite you to conclude the online course on NNT with a final exam, which serves to consolidate the new level of knowledge and consists of 25 questions. If you successfully complete the final exam, you will receive an ALPTREES Certificate at the end.

Thank you very much for participating in the online training course on the sustainable use and management of non-native trees in the Alpine Space!

Find the QUIZ below…

Welcome to Non-native trees QUIZ


In what percentage do you think that NNT cover European forests?

2. of particular importance in the Alpine region are the protective functions of forests, which have a stabilizing effect on the natural environment. Which ones belong here?
3. Pests and diseases are potential threats to non-native tree species as well as to native trees in urban and forest areas. What should be done prior to introducing NNT to a new area?

Try to name at least three NNT species typical for the Alpine region.

5. What can forest owners do to make their forests fit for the impacts of climate change and what can be done to make the forest “climate-smart”?

In the Alpine Space, there are several billion trees of (enter a number) native tree species. By far the most common tree species is Picea abies, the Norway spruce.

7. Which steps are crucial for successful tree management in urban areas?

Which is the most frequent and abundant NNT species in Europe?

9. The lifespan of urban trees is frequently:

The economically most relevant NNT sold by volume is ....  

11. For the identification of different tree species, the dichotomous keys are often used. The following tree characteristics are the most important to determine tree to the species level:

Where do most of the non-native trees in the Alpine region grow?

13. Vital and stable stands are composed of healthy individual trees that have a strong root system, long and broad crowns, and a favourable H/D (height/diameter) value. What should be a value of H/D for a tree to be more stable against natural events (storms, wind)?
14. Which tree-specific characteristics are important for invasiveness potential assessment?

Where are invasive non-native tree species observed most frequently?

16. Urban trees generate significant ecosystem services, such as:

How many non-native species do you think have been identified in the Alpine region?


Which are important ecosystem services and functions that the forests in the Alpine region provide?


Which continent do most of the non-native tree species in the Alpine region originate from?

20. Why is introduction of NNT into urban areas less critical compared to forest areas?

The introduction of NNT in the Alpine space has started in thee 19th century – mainly for  purposes. 


Do the terms non-native and invasive (tree species) have the same meaning?

23. Sustainable management and use of non-native tree species (NNT) in urban areas imply several steps, including identification of suitable tree species and their long-term management. Which criteria NNT has to meet to be considered for planting in urban settlements?
24. Why are invasive species causing concern and need to be managed properly?
25. The impacts of climate change are expected to be particularly severe in the Alpine region. What is expected with warmer temperatures in future in alpine forests?