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Trees on city streets cope with drought by drinking from leaky pipes

July 11, 2025
in Health News
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Trees on the streets of Montreal in Canada benefit from leaky pipes

Catherine Zibo/Shutterstock

Trees growing on city streets are more resistant to drought than those in parks because they are drinking from an unusual water source: leaky pipes.

After long periods with little rain, water levels and sap flow tend to decrease more in trees growing in parks compared with those in streets, but it was unclear why.

To investigate, André Poirier at the University of Quebec in Montreal, Canada, and his colleagues took trunk samples from Norway maple and silver maple trees (Acer platanoides and Acer saccharinum) in parks and streets in two Montreal neighbourhoods. They measured the levels of various lead isotopes – atomically distinct versions of the metal that can indicate unique origins – and then linked the isotope levels to the trees’ recent history by counting the trunk rings.

While the park trees contained lead isotopes normally associated with air pollution, the street trees had isotopes found in lead water pipes, which were made with metal from geologically old deposits in nearby mines.

Maple trees need to consume around 50 litres of water per day. Since street trees can’t get much of this from rainwater, which falls on concrete and drains into the city’s sewers, Poirier says the most likely explanation is that it is coming from Montreal’s leaky pipes, which lose 500 million litres of water per day.

“The good news is that you can keep on planting trees on the street, because it makes people happy to have trees, and they will survive better than in the parks,” says Poirier, who presented his work at the Goldschmidt geochemistry conference in Prague, Czech Republic, on 8 July.

“The scale of water usage by these street trees is phenomenal and it goes against the common paradigm, which is you think that park trees would be much healthier,” says Gabriel Filippelli at Indiana University.

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Source link : https://www.newscientist.com/article/2487804-trees-on-city-streets-cope-with-drought-by-drinking-from-leaky-pipes/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home

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Publish date : 2025-07-11 11:00:00

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