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bark beetle tree

California Tree Mortality At An Unprecedented Level

Tree Mortality Overview

According to U.S. Forest Service study done in the summer of 2017, about 6.3 billion dead trees are still standing in 11 Western states, an increase of half a billion from five years ago. 103 million trees have died in California alone since 2010. So what’s happening to the trees? Well, established trees are normally fairly resilient to seasonal changes in their environment, but the last five years of drought in CA coupled with climate change impacts have imposed several stressors acting on the trees at the same time. Most native California trees are fairly resilient to drought, but a prolonged drought weakens the trees and exposes them to pests and disease that a healthier tree could normally fight off. A recent story by the CBS San Francisco discussed the situation in the Sierra National Forest with two Forestry experts there. They stated that there are more dead trees than live ones and will be dealing with the tree mortality there for many years to come.

Tree Mortality Danger

When a tree dies, its wood dries out and becomes very flammable.  When building a campfire, there’s a reason we use downed wood instead of chopping down live trees. Healthy, living trees have a relatively high moisture content.  This helps trees survive a wildfire and slows the progress of that wildfire. When tree death occurs from old age or other reasons, standing dead or fallen trees provide a large amount of dry fuel for wildfires, encouraging fire growth and hindering efforts to put it out. Not only are decomposing trees more flammable, they can also present a safety hazard to firefighters. Specifically, dead trees can fall during fires (which have resulted in deaths), and fallen trees can be an obstacle preventing vehicles and firefighters from reaching or escaping a wildfire.

bark beetle-caused tree mortality

Bark Beetle impact from 2012 US Forest Service report

What’s Happening to the Trees?

Established trees are fairly resilient to seasonal changes in their environment, so it is difficult to understand exactly what is causing so much tree death in California. Perhaps not surprisingly, several stressors have been acting on the trees at the same time.

Drought:

California saw a five-year historic drought that only just ended this last year. Most native California trees are fairly resilient to drought, but this prolonged drought weakened the trees and made them more susceptible to beetles and disease. Two deadly invaders that a healthier tree could normally fight off.

tree mortality in Julian

Tree death (brown trees) near Julian in San Diego County

Pests:

Tree bark is the main defense for trees against pests, disease, and fires. Bark beetles burrow into the bark and expose the trees to other pests or diseases, and can reduce their fire resiliency. Different types of bark beetles act as pests to different types of trees. The Pines and Conifers in the Sierra Nevada Mountains have been decimated by these beetles. Beetle-kill trees have been blamed for prolonging the firefight on the Beaver Creek Fire in Northern Colorado and also the Cedar Fire in California’s Southern Sierra Nevada Range. Tree deaths due to these beetles have been attributed to several major campaign fires across the west over the past few summers. The map above shows hard-hit beetle kill timber forests across the west (in red), which includes both the Cedar and Beaver Creek fire areas.

Disease:

The coast live oak trees have been exposed to Sudden Oak Death, which is caused by a non-native tree fungus. This fungus and other non-native diseases are responsible for an estimated 5 – 10 million oak tree deaths. Many dead trees were identified in the areas where the Soberanes fire near Big Sur is currently burning and have likely contributed (along with major drought) to its acreage eclipsing 100,000 this week.

Plans for Tree Death Prevention

Drought, pests, and disease all put stress on otherwise healthy trees.  When these stresses are combined, we can expect to see continued tree death at unprecedented scales. California has programs to both reduce the amount of tree death and to remove dead trees as a means of reducing fire danger.  Lately, resources have been too scarce to keep up with the levels of tree deaths plaguing the state. Learn more about the epidemic and what is being done to prevent further problems here.


Sources:

www.fs.fed.us

www.fire.ca.gov

www.yale.edu

The Denver Post

Editor’s Note: This article was originally published in September 2016 and was updated in September 2017

CAL FIRE Transitions Out of Fire Season in NorCal

Fire Season Over for NorCal

Since May 1st of this year, CAL FIRE (California’s state fire agency) has been in “fire season” mode.  This designation denotes a state of higher alert in which staffing is increased, burn restrictions are tightened, and wildfire monitoring efforts are intensified.

With the recent mild and wet weather, all Northern CAL FIRE units north of Fresno (15 of the 27 in California) were able to transition away from fire season into what they call “winter preparedness.” This change in the state’s preparedness level is typically preceded by prolonged rains and cooler forecasted temperatures across the region, lowering the threat of wildfire ignitions and allowing officials to reduce alert levels.

In Northern California, a series of storms and forecasted wet conditions have allowed all of the units to down-staff by releasing seasonal fire stations and firefighters. This also means that burn restrictions have ceased, allowing multiple prescribed fire projects to get underway in the region. The change to winter preparedness typically lasts until the following May when conditions begin to worsen as the summer months approach.

In the map below, we show the fifteen units currently out of fire season and the twelve from Southern California still prepared for higher fire activity. As drought conditions continue to have a hold on Southern and Central California, CAL FIRE will maintain fire season status and staffing to meet the continued threat there.

CALFIRE Unit Fire Season status as of November 2016

CALFIRE Unit Fire Season status as of November 2016

Weather Outlook

The outlook for the Northern California region has improved significantly since earlier this year. Much of the region has been in a long-term drought for years, which has lengthened and stregthened each coinciding fire season. Over the course of this year, the worst of the drought has slowly crept south with mostly moderate drought conditions remaining for areas north of Fresno. Part of the reason has been the return of regular precipitation in northern areas. Rain began to fall in early October and a series of storms at the end of October and through November produced heavier precipitation. As winter sets in, more wet weather systems are expected to continue to bring precipitation to the region, leaving large fire potential at minimal levels through next February.


Sources:

CAL FIRE: Fire Season Status

Lake County News

Sierra Star

North Ops Outlook

Tree Death Fuels California Wildfires

Tree Death Adds Fuel to the Fire

A record 66 million trees have died in California since 2010, adding a huge fuel threat to an already dangerous fire landscape.  Not only are decomposing trees more flammable, they can also present a safety hazard to firefighters. Specifically, dead trees can fall during fires (which have resulted in deaths), and fallen trees can be an obstacle preventing vehicles and firefighters from reaching the fire.

Dead Wood Danger

When a tree dies, its wood dries out and becomes very flammable.  When building a campfire, there’s a reason we use downed wood instead of chopping down live trees. Healthy, living trees have a relatively high moisture content.  This helps trees survive a wildfire and slows the progress of that wildfire. When tree death occurs from old age or other reasons, standing dead or fallen trees provide a large amount of dry fuel for wildfires, encouraging fire growth and hindering efforts to put it out.

Bark Beetle impact from 2012 US Forest Service report

Bark Beetle impact from 2012 US Forest Service report

What’s Happening to the Trees?

Established trees are fairly resilient to seasonal changes in their environment, so it is difficult to understand exactly what is causing so much tree death in California. Perhaps not surprisingly, several stressors have been acting on the trees at the same time.

 

Drought:

California has been in an historic drought for the past five years. Most native California trees are fairly resilient to drought, but a prolonged drought weakens the trees and exposes them to pests and disease that a healthier tree could normally fight off.

Tree death (brown trees) near Julian in San Diego County

Tree death (brown trees) near Julian in San Diego County

Pests:

Tree bark is the main defense for trees against pests, disease, and fires. Bark beetles burrow into the bark and expose the trees to other pests or diseases, and can reduce their fire resiliency. Different types of bark beetles act as pests to different types of trees. The Pines and Conifers in the Sierra Nevada Mountains have been decimated by these beetles. Beetle-kill trees have been blamed for prolonging the firefight on the Beaver Creek Fire in Northern Colorado and also the Cedar Fire in California’s Southern Sierra Nevada Range. Tree deaths due to these beetles have been attributed to several major campaign fires across the west over the past few summers. The map above shows hard-hit beetle kill timber forests across the west (in red), which includes both the Cedar and Beaver Creek fire areas.

Disease:

The coast live oak trees have been exposed to Sudden Oak Death, which is caused by a non-native tree fungus. This fungus and other non-native diseases are responsible for an estimated 5 – 10 million oak tree deaths. Many dead trees were identified in the areas where the Soberanes fire near Big Sur is currently burning and have likely contributed (along with major drought) to its acreage eclipsing 100,000 this week.

Plans for Tree Death Prevention

Drought, pests, and disease all put stress on otherwise healthy trees.  When these stresses are combined, we can expect to see continued tree death at unprecedented scales. California has programs to both reduce the amount of tree death and to remove dead trees as a means of reducing fire danger.  Lately, resources have been too scarce to keep up with the levels of tree deaths plaguing the state. Learn more about the epidemic and what is being done to prevent further problems here.


Sources:

www.fs.fed.us

www.fire.ca.gov