熱浪來襲：樹木為何會倒塌

Recently, there have been several incidents where trees or large branches have fallen during periods of extreme heat. For example, a group of bowlers in Leamington Spa were lucky to avoid injury when a tree branch crashed onto their green. In another case, a Member of Parliament reported that a mature tree fell on her house, and she blamed the soaring temperatures. These events have raised questions about whether heatwaves are making trees more likely to fall.

Dr Anna Gardner, a scientist at the University of Birmingham, studies how climate change affects trees. She explains that during long periods of hot and dry weather, trees lose more water through their leaves than they can take up from the soil. This puts them under water stress, which can change the way their tissues work and make them weaker. As a result, big branches might break off or even the whole tree could fall, even if there is no wind. Not all trees are affected in the same way. The type of tree, its age, and how healthy it is all play a role in how well it can handle the heat.

Some local councils are warning people not to gather under trees for shade during heatwaves because of the risk of falling branches. This is sometimes called sudden branch drop syndrome, and it may be linked to extreme heat. Scientists are now researching how different tree species react to heatwaves and how trees in cities compare to those in forests. By understanding these differences, experts hope to find better ways to care for urban trees. Healthy trees are important because they help cool our towns and cities, improve air quality, and provide homes for wildlife. As heatwaves become more common, it is important to protect our trees so they can continue to benefit people and the environment.