Pampered city trees deal with stress better than their country cousins
They’re facing pollution and extreme heat, but a new study finds that city trees are actually more resilient than you'd think. Here's why.
Urban trees demonstrate remarkable resilience in the face of climate stresses, outperforming their rural counterparts, according to a recent study. Using satellite data from 2001 to 2022, researchers analyzed the impact of climate stresses on vegetation across 751 cities worldwide. They found that in over three-quarters of these cities, urban greenery better coped with extreme heat stress than vegetation in surrounding countryside.
In one-third of the studied municipalities, urban trees exhibited a "dual advantage," retaining less greenness from pressures and recovering faster from these stresses. This increased resilience, the researchers believe, stems from consistent water availability. Cities often employ various methods to ensure proper hydration of urban vegetation, including the use of plastic bladders around tree trunks, widespread irrigation systems, and even strategically designed green spaces that allow rainwater to soak into the ground.
The study's lead author, ecologist Zhengfei Guo from the University of Hong Kong, noted that the harsh urban environment, characterized by high air temperatures and pollution, would typically make vegetation less resilient. However, the findings surprised the researchers, who posit that the pampering of urban vegetation plays a significant role in its increased resilience.
Urban water management practices, such as the construction of "sponge city" infrastructure and the use of spreading grounds, are also contributing to the enhanced resilience of urban trees. These measures allow rainwater to percolate into the ground, keeping moisture levels high and making it more available for plants to use.
As cities continue to evolve and face increasing challenges posed by climate change, prioritizing the planting of drought-tolerant species and importing species adapted to hotter climates is crucial. Additionally, the implementation of innovative water management strategies, such as the creation of urban gardens and rooftop crops, can further bolster the resilience of urban vegetation.
These efforts will be instrumental in ensuring that cities remain vibrant, biodiverse, and capable of withstanding the environmental pressures of the future.
Written by urgent.news from Grist's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
