The fight against the heat: Vienna's trees under strain
Vienna, the vibrant metropolis at the heart of Europe, faces a huge challenge: climate change is not sparing its proud urban trees. While people seek refuge in the shade of the trees at temperatures above 30 degrees, the trees themselves are helplessly exposed to extreme weather conditions. But the city of Vienna has a plan to save its green lungs!
The invisible heroes: 150 watering teams in action
More than 500,000 urban trees are among the green treasures of the Danube metropolis. To protect them from the effects of heat and drought, the city has deployed an impressive fleet of 150 specially trained watering crews. They are the true heroes in the fight against the urban heat island that settles over the city like an invisible dome.
- 70 specially trained arborists look after the trees year-round.
- 150 employees are responsible for daily watering during the summer months.
- Around 400,000 liters of water are supplied to the trees daily during heatwaves.
"We plant between 4,000 and 4,500 trees in Vienna each year, because they remain the best, most sustainable and longest-lasting cooling devices," explains City Councillor for Climate Jürgen Czernohorszky emphatically. But it takes about 20 years for a tree to reach its full climate effectiveness.
High-tech against heat: automatic irrigation systems and watering bags
In the fight against heat, Vienna relies on state-of-the-art technology. The city operates over 1,000 automatic irrigation systems, which are continuously being expanded. These high-tech systems are installed underground in parks and green spaces as well as in the tree pits. Where this is not possible, the so-called watering bags are used: irrigation sacks that are placed around the trunk of the young tree and filled with up to 75 liters of water.
Each of these sacks is refilled regularly, while another 100 liters are poured directly into the tree pit. These measures are crucial to protect young trees during the first four years of their lives, as they are particularly vulnerable to environmental stress during this period.
The sponge-city principle: an innovative solution
But the city of Vienna goes one step further. With the sponge-city principle it has developed an innovative technique that expands the root space of trees under streets, parking lots and sidewalks. This enables better storage of rainwater and helps the trees better withstand stress factors such as heat and drought.
"The sponge-city principle not only promotes healthy urban trees, but also improves the urban microclimate, sequesters CO₂ and supports biodiversity," explains an expert from Vienna's city gardens. "It is a crucial contribution to resource conservation and to adapting to climate change."
A look to the future: challenges and opportunities
The challenges facing the city of Vienna are considerable. Not all tree species are able to withstand the multiple stress factors. Therefore, the city has adapted its tree selection and is now planting more species that cope particularly well with the urban climate. In total, the assortment consists of 25 different tree species, chosen to withstand the new climatic conditions.
"Our goal is to keep the city trees vital through targeted maintenance measures so that they can support us in the long term with all their valuable climate services," emphasizes Czernohorszky. "Trees are guarantors of our quality of life, and we must be the guarantors of their well-being."
The measures the City of Vienna has taken are impressive, but they are only part of a larger puzzle. The fight against climate change requires cooperation among cities worldwide to develop and implement innovative solutions. Vienna has taken an important step in the right direction with its efforts, but the work is far from over.
What does this mean for citizens?
For the citizens of Vienna these measures are of great importance. The city trees not only help improve air quality, but also provide shade and recreation in an increasingly urbanized environment. The city's efforts to protect these natural climate systems ultimately benefit all residents.
Looking ahead, the city plans to further intensify its efforts and invest even more in the care of its trees. This will not only benefit the trees themselves but will also help improve quality of life in the city and mitigate the impacts of climate change.
Conclusion: A role model for other cities
The measures taken by the City of Vienna could serve as a model for other cities facing similar challenges. By employing modern technologies and innovative techniques, Vienna shows that it's possible to tackle the impacts of climate change decisively while at the same time improving quality of life in the city.
The City of Vienna has recognized that caring for its urban trees is not only an ecological necessity but also an investment in the future. With a clear plan and decisive measures, it has shown that it is possible to face the challenges of climate change with confidence and determination.
