Fire issues in California's Central Coast Region

From CCoWS Wiki
Revision as of 16:41, 5 April 2017 by Lizzye (Talk | contribs)

Jump to: navigation, search

Note: This page is currently under construction (4/5/17)

A watershed-related topic examined by the ENVS 560/L Watershed Systems class at CSUMB. This page gives a brief history of the major wildfires that have affected the Central Coast since 1950, and strives to portray the benefits and challenges wildfire presents to the people and ecosystems of the region.

Summary

The various ecosystems that comprise the central California landscape have adapted to fire over time.[1][2] As California's population grows, urban expansion into natural areas is becoming more commonplace, creating a higher risk to human life and infrastructure in the event of wildfire. Historically, lightning fires and purposeful ignitions by indigenous tribes ensured rather frequent fires of low to moderate severity.[3] Years of fire suppression, coupled with prolonged drought conditions, however, have changed the fire regime on the Central Coast,[4] yielding a greater challenge when it comes to mitigating fire damage to both ecosystems and man-made infrastructure.

Location and Management

Image 1. Public land distribution in Central Coastal California. Copyright Interactive Outdoors, Inc.[1]

Wildfires in the Central Coast Region occur on both private and public land on the Central Coast (Image 1). Due to the close proximity of different land jurisdictions in the area, fire management often involves multiple agencies including but not limited to: the Forest Service, CalFire, California State Parks, Bureau of Land Management, individual counties, volunteer fire brigades, and other entities that manage open space or rural areas.


In the early part of the 20th Century, United States land managers generally believed that fire exclusion promoted ecological stability. It wasn't until the mid 1960's that fire was scientifically proven to provide ecological benefits, resulting in gradual shifts in fire management policy to allow more fires to take their natural course.[5] As a result of changing policies and shifts in climatic patterns in the western United States, large wildfire frequency and duration have increased and wildfire seasons have lengthened since 1970.[6] Most recently, federal fire management policy has emphasized fuels management treatments such as prescribed burns and mechanical thinning to prevent catastrophic wildfires.[5]

Ecological Benefits of Fire

Image 2. California condor #167 in a burned out redwood cavity in Big Sur, CA, on 28 March 2006, Photo by Joseph Brandt, Ventana Wildlife Society.

Ecological benefits of wildfire on the Central Coast abound. The following list is a snapshot of some of the many benefits fire can bring to the ecosystems of the region:

  • Growth stimulation of native plants: The chaparral, oak woodland, redwood forest, and grassland ecosystems, characteristic of the region, are well-adapted to fire. Many plants in these ecosystems depend on wildfire for germination cues, restarting the succession cycle, protection against disease, and making nutrients available for uptake.[7]
  • Replenishment of sand for river and ocean beaches: Steep, fractured, granitic slopes, characteristic of the coastal mountain ranges, erode easily, especially when saturated. If a fire has burned the vegetation in the area, and damaged root systems that help stabilize soil, larger than normal debris flows and landslides can occur during the rainy season. Although these processes can pose inconveniences to humans living in affected watersheds, fluvial sediment transport is the main mode of beach sand replenishment on the West Coast. Therefore, fires play an instrumental role in ensuring beach sustainability.[8]
  • Creation of habitat: Fire generally burns in irregular patterns and varies in intensity. The mosaic that results destroys habitat for some animals while creating habitat for others. Cavity nesters, or birds that live in holes in trees, often benefit from fire. One such bird is the endangered California condor whose range is slowly being reestablished on the Central Coast. The wide cavities created by fire in the tops of redwood trees have served as ideal nesting spots for multiple condors on the Big Sur coast (Image 2).[9]



Resources at Stake

Hot, dry conditions on the Central Coast during late spring, summer, and fall contribute to fire risk. In the fall and early winter, it is not atypical for Santa Ana winds to fan and spread active fires.[10] This combination of high temperatures and warm winds contributes to increasing flammability of dead and live fuel sources and is often exacerbated by drought conditions.[6]

Potentially Negative Ecological Impacts of Fire

Wildfires have a number of impacts on local ecosystems that could be considered negative. The following is a brief list of some of these effects:

  • Ecosystem type conversion: Today's transportation technology allows for humans to travel far distances in a relatively short amount of time. Because of this capability, certain historical biogeographical barriers have been broken down, exposing native ecosystems to a variety of pathogens and plant and animal species that would not otherwise be in a given location. Type conversion, or the conversion of chaparral ecosystems to nonnative grassland, is becoming more common in Central California in the wake of fire.Cite error: Closing </ref> missing for <ref> tag
  • Increased in turbidity: Turbidity, or the


in post-fire flows make it hard for fish to survive.

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.579.8223&rep=rep1&type=pdf Lisle TE. 1989. Sediment transport and resulting deposition in spawning gravels, north coastal California. Water resources research, 25(6):1303-1319.


-Difficulty of regeneration after crown fires

Negative Impacts for Humans in the Wake of Fire

-Cost to taxpayers for management -loss in tourism, tourism brings in how much revenue per year -mudslides, erosion, impeded access -home and life loss -increased flood risk post fire -decrease in air quality for duration of fire

Past Fires and their Impacts on the Region

Laws, policies, & regulations

Aid from county budgets. State of emergency funding from State of Federal sources.

...What laws, policies, and/or regulations are involved?...

Future research

...What scientific studies are or would be relevant / already completed?.. ...What analytical (e.g. modeling) tools were or could be used?.. ...What knowledge gaps remain?...

...Suggest a CWSP MS thesis topic that could contribute to the issue...

...Suggest a topic for a hypothetical study that had unlimited resources...

References

  1. Stephens SL, Fry DL. 2005. Fire history in coast redwood stands in the northeastern Santa Cruz Mountains, California. Fire Ecology,1(1):2-19.
  2. (USFS)Fried JS, Bollinger CL, Beardsley D. 2004. Chaparral in southern and central coastal California in the mid-1990s: area, ownership, condition, and change. PNW-RB-240. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 86 p.
  3. Keeley JE. 2002. Native American impacts on fire regimes of the California coastal ranges. Journal of Biogeography, 29(3):303-320.
  4. Greenlee JM, Langenheim JH. 1990. Historic fire regimes and their relation to vegetation patterns in the Monterey Bay Area of California. The American Midland Naturalist 124(2):239-53. doi:10.2307/2426173.
  5. 5.0 5.1 (NPS & USFS) National Park Service and United States Forest Service. 2001. Review and Update of the 1995 Federal Wildland Fire Management Policy. (Internet). (cited 2017 April 05).
  6. 6.0 6.1 Westerling AL, Hidalgo HG, Cayan DR, Swetnam TW. 2006. Warming and earlier spring increase western US forest wildfire activity. Science, 313(5789):940-943.
  7. Hanes TL. 1971. Succession after Fire in the Chaparral of Southern California. Ecological Monographs, 41(1)): 27-52. doi:10.2307/1942434.
  8. Willis CM, Griggs GB. 2003. Reductions in fluvial sediment discharge by coastal dams in California and implications for beach sustainability. The Journal of Geology, 111(2):167-182.
  9. Burnett LJ, Sorenson KJ, Brandt J, Sandhaus EA, Ciani D, Clark M, David C, Theule J, Kasielke S, Risebrough RW. 2013 Eggshell thinning and depressed hatching success of California Condors reintroduced to central California. The Condor, 115(3):477-491.
  10. Westerling AL, Cayan DR, Brown TJ, Hall BL, Riddle LG. 2004. Climate, Santa Ana winds and autumn wildfires in southern California. Eos, 85(31):289-296.

Disclaimer

This page contains student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of CSUMB, its staff, or students.