As the earth warms and the precipitation patterns change, trees are expected to migrate north seeking weather they are adapted to. Scientists project trees will need to move faster than their natural abilities through seed spreading:
John Emery makes his way through a secluded orchard of chestnut trees in Weston where chestnut blight-resistant tree hybrids are being cultivated.
“We're simultaneously trying to restore the chestnut in our experiment, as well as testing how well it will perform in a future environment if moved a bit farther north,” said Peter Clark, theAfter a blight fungus decimated American chestnut trees across the eastern U.S. in the mid-20th century, dedicated naturalists have kept the species alive by breeding hybrids of the American chestnut with the Chinese chestnut.
In his study, out of nine tree species that were transplanted, the chestnuts ranked second in growth and survival. It doesn’t mean it was easy for the chestnut hybrids — they grew fast in the spring, but cold snaps injured their roots in the winter. Still, over time, more than 400 chestnuts continue to grow.
She thinks studies of assisted tree migration like Clark’s will be key to learning how to manage forests with climate change. He also pointed to the importance of human assisted migration in the past, when Indigenous peoples helped spread chestnut seeds that formed the original American chestnut range. “The bigger movement historically would have been on Indigenous people just given how important it was to their culture for food staple.”While the researchers are hopeful that the chestnut hybrids take root in northern climates, the reality is these trees are considered functionally extinct.
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