Few living beings have experienced as much as the giant sequoias. With ancestors dating back to the Jurassic era, some of the trees that now grow along California’s Sierra Nevada Mountains have been alive for thousands of years, bearing witness to most of human history — from the fall of the Roman empire to the rise of Beyonce.
A couple hundred years of human encroachment on to the sequoias’ habitat, combined with the climate crisis, increasingly intense wildfires and drought have threatened the species’ future.
The last of the world’s most massive trees now live on just 73 groves scattered across the Sierras. Most lie within protected national parks such as Sequoia National Park, where visitors flock from around the world to marvel at General Sherman, the world’s most massive tree.
However, not all sequoias are protected within the park’s system.
Now, in an ambitious bid to secure a future for them, a conservation group has struck an unusual deal to acquire the last, largest privately owned sequoia grove.
The deal is the result of two decades of discussions between the nonprofit conservation group Save the Redwoods and the Rouch family, which has owned the 214.48 hectare Alder Creek grove since before World War II. The forest is home to hundreds of sequoias, including the Stagg Tree which — at more than 74m tall and 33m around — is the fifth-largest in the world.
The Rouches agreed to sell their land for US$15 million, which the organization hopes to raise by the end of this year. Once they acquire the land, the group plans to work with ecologists to help the forest build resilience against global heating and its catastrophic consequences.
“The forest is truly ancient, and we’ve now got this extraordinary, unique opportunity to restore and protect it,” Save the Redwoods president Sam Hodder said.
Although sequoias have evolved to withstand temperature changes, extreme heat and fire, drought and destructive wildfires are now proving to be the biggest threats to their survival. Curiously, decades of humans fighting fires has made the problem worse.
“Giant sequoias really need wildfire,” Save the Redwoods forest ecologist Kristen Shive said, adding that their cones are cued up to open with the heat of a fire, releasing seeds that like to germinate in freshly burned, fertile forest floor.
For millions of years, “sequoias adapted to survive and thrive with regular, low-level fires,” Shive said.
With their thick barks and high crowns, most mature giant sequoias are immune to fires that burn through almost everything else around them.
“But over the past century, we moved in, and started stopping fires everywhere,” Shive said.
Woody debris began to accumulate on the forest floor, and small trees and saplings began to overcrowd it.
“That serves as kindling,” Shive said, adding that it feeds fires that burn longer and hotter than sequoias could bear.
Smaller trees serve as “ladders,” allowing the fires to climb up to the sequoia’s crowns and kill them.
Climate change has not helped. Intense heat waves and drawn-out periods of drought have left California’s forests drier, and more prone to wildfires.
Droughts also depleted giant sequoias, weakening them and leaving them vulnerable to bark beetles that chomp through their bark and spread a fungus that could kill them. Healthy trees are usually able to fight off a beetle attack — but dehydrated trees are defenseless.
“There’s a handful of giant sequoia trees that died in the recent drought,” said Anthony Ambrose, a plant ecologist at University of California, Berkeley.
“Restoring these lands and stewarding these groves is going to be a big job,” Ambrose said. “It takes a lot of money to take care of these lands.”
Save the Redwoods plans to make that investment in the coming years, as well as install trails and roads “in a way that is mindful of the ecological sensitivity,” Hodder said, adding that the land would eventually be transferred to the US National Park Service.
“Once it’s ready, we really do want to give the public access to this area, because it’s remarkable — the cinnamon bark, the incredible shades of green in the alpine meadows, that unique Sierra blue sky,” Hodder said.
“I firmly believe that a walk in these woods can make you a better person,” he said.
Members of the Rouch family concur.
“We talked to a few buyers over the years, but I’m very happy we’re selling it to Save the Redwoods,” said Mike Rouch, who grew up in the forest, playing in the creeks and climbing the trees.
Rouch’s grandfather and father ran a logging business, and although they chopped down many fir, sugar pine and cedar trees to feed the family’s lumber mill, they left most of the sequoias to stand.
“Nobody in the family ever really wanted to cut them down,” Rouch said. “For one, they’re not very good, structural wood, and the other thing is you just have to look at them. They’re so beautiful, and you realize once they’re gone, they’re gone.”
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