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http://www.sfgate.com/news/article/Unprecedented-More-than-100-million-trees-10624642.php
Californias lingering drought has pushed the number of dead trees across the state past 100 million, an ecological event experts are calling dangerous and unprecedented in underlining the heightened risk of wildfires fueled by bone-dry forests.
In its latest aerial survey released Friday, the U.S. Forest Service said 62 million trees have died this year in California, bringing the six-year total to more than 102 million.
Scientists blame five-plus years of drought on the increasing tree deaths tree fatalities increased by 100 percent in 2016 but the rate of their demise has been much faster than expected, increasing the risk of ecologically damaging erosion and wildfires even bigger than the largest blazes the states seen this year.
Its not beyond the pale to suggest that this is a pretty unprecedented event in at least recent history, said Adrian Das, an ecologist with the U.S. Geological Survey.
There are about 21 million acres of trees spread across Californias 18 national forests, and the latest figures show 7.7 million of them more than one-third are dead.
The U.S. Forest Service has earmarked $43 million in California to help restore eroded sections of roads and trails throughout the states wooded areas, but officials say too much money is being spent on fighting wildfires that are becoming more and more common, as opposed to restoring the scarred forests.
The majority of the 102 million dead trees are in the southern and central Sierra Nevada region, the survey found, but the Forest Service also warned of tree deaths on the rise in northern regions, especially in Siskiyou, Modoc, Plumas and Lassen counties.
Rising temperatures throughout the state arent helping matters, and neither are the persevering infestations of bark beetles fond of gnawing through pine trees stressed by drought, leaving in their wake thousands of acres of brown, dead wood.
From his base in Sequoia National Park, Das said pines are dying faster than firs, but all the acres of trees he studies have been drying out and falling over faster than they should.
Tree mortality, and what drives it, is still a poorly understood process, Das said, adding that one of few immediate upsides to the stands of dying trees is that scientists can better study what specifically is causing their demise.
The old-growth forests he studies resplendent with massive sequoia trees and sugar pines that often live for centuries are changing more rapidly than he has ever seen, a matter of months in what usually unfolds over years or decades.