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Landscaping for drought : We’re doing it wrong

ScienceDaily (January 11, 2023)

Titre : Landscaping for drought : We’re doing it wrong

Trees’ tolerance, watered down

ScienceDaily (January 11, 2023)

Despite recent, torrential rains, most of Southern California remains in a drought. Accordingly, many residents plant trees prized for drought tolerance, but a new UC Riverside-led study shows that these trees lose this tolerance once they’re watered

One goal of the study was to understand how artificial irrigation affects the trees’ carbon and water use. To find out, the researchers examined 30 species of trees spread across Southern California’s urban areas from the coast to the desert. They then compared those trees with the same species growing wild.

To obtain their findings, the researchers enlisted the help of trained community scientists to locate some of the most common Southern California street trees, ensure these specimens were healthy, and that the area at the base of the tree was at least 65% irrigated.

Included in the study were such familiar species as eucalyptus, tree ficus, crepe myrtle, sweetgum, live oak, jacaranda, sycamore and Brazilian pepper trees, but not palms. Though palms are closely identified with California, botanists do not consider them trees.

Drought tolerant trees often restrict their water use to protect themselves from drying out when temperatures rise. However, with the exception of ficus, the irrigated trees all increased their water intake.

Story Source  : University of California - Riverside

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Page publiée le 12 janvier 2023, mise à jour le 13 janvier 2023