Californians watched in dismay this month as the York fire seared through Mojave National Preserve, igniting a delicate desert landscape that may never fully recover.
chewed through stands of beloved Joshua trees, torching their tops and potentially incinerating their roots. Park officials fear that millions may have been burned in the fire, though the precise number of those killed will be hard to discern from the piles of ash that remain.
About one-third of the state is covered by forested ecosystems, and they have always experienced some form of drought, fire and tree death, he said."But the problem is we're seeing tree mortality rates that are far beyond those endemic levels. There's no doubt that climate is exacerbating what we're seeing."
Ponderosa pines are also suffering from bark beetles and heat-related stress, said Avery Hill, a postdoctoral researcher at the California Academy of Sciences. He noted that for every 1.8 degrees of additional global warming, up to 40% more trees could die from beetle infestations. His study came on the heels of another one published last November, which found that nearly a third of southern Sierra forests were killed by wildfires, drought and pestilence over the last decade.
"California's climate is warming and drying fast enough that it's sort of lifting the lid off of where fire can go," said Jon Wang, an associate professor at the School of Biological Sciences at the University of Utah, who led the study. The fire, along with another blaze known as the Windy fire, scorched 27 giant sequoia groves and killed as many as 2,380 trees, according to the National Park Service.
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