Firefighters have wrapped the base of the world’s largest tree in a fire-resistant blanket as they tried to save a famous grove of gigantic old-growth sequoias from wildfires burning in California’s rugged Sierra Nevada.
The colossal General Sherman tree in Sequoia national park’s giant forest, some of the other sequoias, the Giant Forest Museum and other buildings were wrapped as protection against the possibility of intense flames, fire spokesperson Rebecca Paterson said.
The aluminium wrapping can withstand intensive heat for short periods. Federal officials say they have been using the material for several years throughout the US west to protect sensitive structures from flames. Homes near Lake Tahoe that were wrapped in protective material survived while others nearby were destroyed.
The Colony fire, one of two burning in Sequoia national park, was expected to reach the Giant Forest, a grove of 2,000 sequoias, at some point on Thursday. It comes after a wildfire killed thousands of sequoias, some as tall as high-rises and thousands of years old, in the region last year.
The General Sherman tree is the largest in the world by volume, at 1,487 cubic meters, according to the National Park Service. It towers 84 meters high and has a circumference of 31 meters at ground level.
A 50-year history of using prescribed burns – fires set on purpose to remove other types of trees and vegetation that would otherwise feed wildfires – in the parks’ sequoia groves was expected to help the giant trees survive by lessening the impact if flames reach them.
A “robust fire history of prescribed fire in that area is reason for optimism”, Paterson said. “Hopefully, the Giant Forest will emerge from this unscathed.”
Giant sequoias are adapted to fire, which can help them thrive by releasing seeds from their cones and creating clearings that allow young sequoias to grow. But the extraordinary intensity of fires – fuelled by climate change – can overwhelm the trees.
That happened last year when the Castle fire killed what studies estimate were 7,500 to 10,600 large sequoias, according to the National Park Service.
A historic drought and heat waves tied to climate change have made wildfires harder to fight in the American west. Scientists say climate change has made the region much warmer and drier in the past 30 years and will continue to make weather more extreme and wildfires more frequent and destructive.
The fires forced the evacuation of the park this week, and parts of the town of Three Rivers outside the main entrance remained evacuated Thursday. A bulldozer was cutting a line between the fire and the community.
The wildfires are among the latest in a long summer of blazes that have scorched nearly 9,195 sq km in California, destroying hundreds of homes.