Understanding Our New Wildfire Crisis: Can We Tame the Blazing Beast
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Understanding Our New Wildfire Crisis: Can We Tame The Blazing Beast Chris Ineich Mendocino College and Sonoma State University 1 Since 2015, our region has been hit harder than any other by wildfire… • And it’s reshaping our world and reputation! vividmaps.com 2 An unprecedented fire year • >4 million acres burned1 -more than 4% of total land area in state • 5 of the 6 largest fires in California history occurred in 20202 https://en.wikipedia.org/wiki/2020_California_wildfires#/medi a/File:2020_California_wildfires.png 1 https://www.fire.ca.gov/incidents/2020/ 2https://www.fire.ca.gov/media/11416/top20_acres.pdf 3 4.0 3.5 3.0 2.5 2.0 Acres Burned in California Wildfires https://www.nytimes.com/2020/09/10/briefing/california-wildfires-bob-woodward-coronavirus-your-thursday-briefing.html 3 of the 5 largest fires in California history have affected some combo of Mendocino, Lake, Sonoma or Napa Counties #1: August Complex (2020)-1,032,648 acres #2: Ranch Fire (2018)-410,203 acres #5: LNU Complex Fires (2020)-363,220 acres Regional wildfire toll since 2015 -More than 2.3 million acres burned -More than 15,000 buildings destroyed -52 lives lost Redding Pieces of a 6-year burn Red Bluff scar puzzle August Complex Fire (2020) • Contiguous burn scar covers more than 2-million acres Ukiah Ranch Fire -70 times the size of San (2018) Rocky & Francisco Valley, Kinkade, Jerusalem Tubbs, Nuns, Fires (2015) Atlas, Glass Fires • N-S extent spans entire length of (2015-20) LNU Complex (2020) Inner North Coast Ranges Santa -Equivalent to distance from Rosa Fairfield Fairfield to just south of Redding • roughly 160 miles! 6 Contiguous burn area includes… • Nearly all of Mendocino National Forest -And Berryessa-Snow Mountain National Monument • Entire viewshed of Lake Berryessa Fires burned all or part of: • 3 national forests, 4 state wildlife areas, 7 federal wilderness areas, 3 University of California field stations, 5 state parks or forests, 9 regional or county parks and about a dozen public or private nature preserves 7 Smoky Got It Wrong • Suppressing natural fires for all those years allowed fuel to build up to a point where fires became uncontrollable 8 Wildfires can produce many ecological benefits • Recycle nutrients and detritus • Control pests and diseases • Reduce competition between plants, allowing the survivors to be more robust and healthy • Reduce fuels for more destructive fires in the future • Create a diversity of habitats, benefiting wildlife and increasing biodiversity • Stimulate growth and reproduction of fire-dependent plants 9 Plant adaptations to fire: Fire-induced Reproduction Serotinous cones require calflora Bryant Baker fire to open up and Fire Followers require release seeds fire to germinate -e.g. Knobcone and Bishop -e.g. Whispering Pines, Giant Sequoia Bells 10 Plant adaptations to fire: Sprouting http://sonomavegmap.org/firestory/index.html Trunk sprouting in Coast Redwood Pacific Madrone 1-yr after fire Pacific Madrone 8-yrs after fire 11 Plant adaptations to fire: Thick Bark Thick, insulating bark protects internal tissues -True of many needleleaf conifers (e.g. Redwood, Douglas-fir, Ponderosa Pine) and savanna oaks (e.g. Blue Oak, Valley Oak) 12 Burned landscapes can be more resilient than you might think 13 Burned landscapes can be more resilient than you might think 14 Postfire recovery can be swift alltrails.com alltrails.com Wilson Valley overlook; Cache Creek Same site in 2019, 4-years after Rocky Fire Wilderness 2013 15 California is a fire-adapted ecosystem • Summer-dry Mediterranean climate makes region susceptible to fire • Ignitions have long been provided by lightning and humans -63,000 lightning strikes per year across California1 -Native Californians once intentionally set thousands of fires every year as part of traditional land management practices Van Wagtendonk & Cayan. 2008. Temporal and spatial distribution of lightning strikes in California in relation to large-scale weather patterns. Fire Ecology (https://www.researchgate.net/publication/254921807_Temporal_and_Spatial_Distribution_of_Lightning_Strikes_in_Calif ornia_in_Relation_To_Large-scale_Weather_Patterns) 16 Before European settlement, indigenous Californians used fire as a management tool “Fire was the most significant, effective, efficient, and widely employed vegetation management tool of California Indian tribes…Deliberate burning increased the abundance and density of edible tubers, greens, fruits, seeds, and mushrooms; enhanced feed for wildlife; controlled the insects and diseases that could damage wild foods and basketry material; increased the quantity and quality of material used for basketry and cordage; and encouraged the sprouts used for making household items, granaries, fish weirs, clothing, games, hunting and fishing traps, and weapons. It also removed dead material and promoted growth through the recycling of nutrients, decreased plant competition, and maintained specific plant community types ”1 Professor M. Kat Anderson, UC Davis 1Anderson. 2005. Tending the Wild: Native American Knowledge and the Management of California’s Natural Resources. UC Press. p. 136 17 Certain California plant communities probably owe their existence to indigenous burning Without fire or grazing, coastal prairies transition to scrub community 18 Father Juan Crespi described the Central Coast while it was still under indigenous management We “went over some pretty high hills with nothing but soil and grass, but the grass all burnt off by the heathens…and (we) shortly descried from the height a large arm of the sea (San Francisco Bay).”1 Nov 4, 1769; traveling over Sweeney Ridge (San Mateo County) (1)Recounted in: J. Paddison. 1999. A World Impenetrable coastal scrub covers Sweeney Transformed: Firsthand Accounts of California Before the Gold Rush; p. 16. Heyday Books. Ridge today 19 Native Californians used prescribed fire to maintain prairies and oak woodlands in forested regions 20 Douglas-fir invasion… 21 Fir eventually overtops oaks If there are enough of them, may kill oaks by depriving them of sunlight 22 Many mountain meadows are the product of indigenous burning 1899 1994 George Gruell. 2001. Fire in Sierra Nevada Forests: A Photographic Interpretation of Ecological Change Since 1849. Mountain Press. 23 Yosemite’s former caretakers comment on the change “Some native people, displaced during Euro-American settlement…returned to their homelands years after relocation only to find them overgrown and untended. Maria Labrado Ydrte, granddaughter of Chief Tenaya of the Southern Sierra Miwok…returned to her beloved Yosemite after seventy- eight years. She shook her head and said, “Too dirty, too much bushy.”” Her great-grandson James Rust elaborated: “In the old days, there used to be a lot more game-deer, quail, grey squirrels, rabbits. They burned to keep down the brush. The fires wouldn’t get away from you. It wouldn’t take all the timber like it would now…I remember Yosemite when I was a kid. You could see from one end of the Valley to the other. Now you can’t even see off the road.” 1Recounted in Anderson. 2005. Tending the Wild: Native American Knowledge and the Management of California’s Natural Resources. UC Press. pp. 156-157 24 Reconstructing pre-settlement fire regimes Tom Swetnam Fire scars leave a dateable record of past fire in tree rings 25 Reconstructing pre-settlement fire regimes Redwood Forest: 15 yrs Douglas-fir-Mixed Hardwood Oak Woodlands: 12 yrs Forest: 13 yrs Median Fire Return Intervals Van de Water and Stafford. 2011. A summary of fire frequency estimates for California vegetation prior to Euro-American settlement. Fire Ecology Vol 7, Issue 3, pp 26-58 (https://www.fs.fed.us/rm/pubs/rmrs_gtr292/2011_vandewater.pdf) 26 2020 burn acreage isn’t so unusual California-Average Annual Wildfire Acres In the context of the pre- settlement fire regime, 2020 was an average fire year! 1950-99 2000-09 2010-19 2020 Pre-1800 Estimate Stephens et al. 2007. Prehistoric fire area and emissions from California’s forests, woodlands, shrublands and grasslands. Forest Ecology and Management: Vol 251, Issue 3; pp 205-216. (https://www.sciencedirect.com/science/article/abs/pii/S0378112707004379) 27 The nature of fire has changed Fires intentionally set by Fires started accidentally and Native Californians under burning under extreme mild weather conditions weather conditions Fire intensity limited by Fire intensity amplified by sparse fuels oversupply of fuels 28 Fire suppression allowed fuels to accumulate Feather River Canyon, Plumas County 1890 1993 George Gruell. 2001. Fire in Sierra Nevada Forests: A Photographic Interpretation of Ecological Change Since 1849. Mountain Press. 29 Our forests now have too many ladders… Surface Fire Crown Fire 30 Non-sprouting tree species aren’t adapted to crown fire Douglas-fir forest after a healthy Douglas-fir forest after a stand- surface fire destroying crown fire 31 Local forest/woodland communities destroyed by crown fire Mixed Conifer Forest after 2015 Valley Fire and post- fire salvage logging on Cobb Mountain Blue Oak Shasta fir forest in the Snow Woodland in Mountain Wilderness Area Cache Creek destroyed by 2018 Ranch Fire Wildlife Area destroyed by 2015 Rocky Fire Photos from alltrails.com 32 Modern fires pose an increasing threat to people and infrastructure The Los Angeles Times 33 California has racked up a huge wildfire debt -The bill has come due and were paying it back in interest David McNew Northern Arizona University 34 Luckily, there’s a way we can work off some of that debt… The Nature Conservancy 35 Luckily, there’s a way we can work off some of that debt… The Nature Conservancy The good news: Calfire, the U.S. Forest Service, California State Parks, some local tribes and local prescribed burn associations already have prescribed burn programs 36 The anatomy of a successful forest fuel treatment Large diameter trees are retained to shade the understory -But they are limbed up to minimize laddering Taller understory fuels are mechanically thinned U.S. Forest Service Forest is underburned to remove slash and excess litter 37 Oak Woodland Fuel Treatments Burn off grass thatch and invading conifers, brush, etc.