The fight against the heat: Vienna's trees in distress
Vienna, the vibrant metropolis in the heart of Europe, faces a huge challenge: climate change does not spare the proud city trees. While people seek refuge in the shade of the trees at temperatures above 30 degrees, the trees themselves are defenseless against extreme weather conditions. But the city of Vienna has a plan to save its green lungs!
The invisible heroes: 150 watering crews 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 personnel. They are the true heroes in the fight against the urban heat island, which lies over the city like an invisible dome.
- 70 specially trained arborists take care of the trees year-round.
- 150 employees are responsible for watering daily during the summer months.
- The trees are supplied with around 400,000 liters of water daily during heat periods.
"We plant between 4,000 and 4,500 trees per year in Vienna because they remain the best, most sustainable and longest-lasting cooling devices," explains Climate Councillor Jürgen Czernohorszky emphatically. But it takes about 20 years for a tree to develop its full climate effectiveness.
High-tech against heat: automatic irrigation systems and Gießbags
In the fight against the 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 tree pits. Where this is not possible, the so-called Gießbags are used: irrigation bags that are placed around the trunk of the young tree and filled with up to 75 liters of water.
Each of these bags is regularly refilled, while a further 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 time.
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 zone of trees beneath roads, parking lots and sidewalks. This enables better storage of rainwater and helps the trees to 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, binds CO₂ and supports biodiversity," explains an expert from the Vienna City Gardens. "It is a decisive contribution to resource conservation and to adapting to climate change."
A look into 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 adjusted its tree selection and now increasingly plants species that cope particularly well with the urban climate. Overall, the selection consists of 25 different tree species chosen to withstand the new climatic conditions.
"Our goal is to keep the urban trees vital with 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 of the city of Vienna are impressive, but they are only part of a larger puzzle. The fight against climate change requires collaboration among cities worldwide to develop and implement innovative solutions. With its efforts, Vienna has taken an important step in the right direction, 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 urban trees not only contribute to improving 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.
For the future, 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 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 of the city of Vienna could serve as a model for other cities facing similar challenges. Through the use of modern technologies and innovative techniques, Vienna shows that it is possible to confront 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 determined measures, it has shown that it is possible to meet the challenges of climate change with confidence and resolve.
