Journal article
Evaluating short- and long-term impacts of fuels treatments and simulated wildfire on an old-forest species
Ecosphere (Washington, D.C), Vol.6(12), pp.1-18
12/01/2015
DOI: 10.1890/ES15-00234.1
Abstract
Fuels-reduction treatments are commonly implemented in the western U.S. to reduce the risk of high-severity fire, but they may have negative short-term impacts on species associated with older forests. Therefore, we modeled the effects of a completed fuels-reduction project on fire behavior and California Spotted Owl (Strix occidentalis occidentalis) habitat and demography in the Sierra Nevada to assess the potential short-and long-term trade-offs. We combined field-collected vegetation data and LiDAR data to develop detailed maps of forest structure needed to parameterize our fire and forest-growth models. We simulated wildfires under extreme weather conditions (both with and without fuels treatments), then simulated forest growth 30 years into the future under four combinations of treatment and fire: treated with fire, untreated with fire, treated without fire, and untreated without fire. We compared spotted owl habitat and population parameters under the four scenarios using a habitat suitability index developed from canopy cover and large-tree measurements at nest sites and from previously derived statistical relationships between forest structure and fitness (lambda) and equilibrium occupancy at the territory scale. Treatments had a positive effect on owl nesting habitat and demographic rates up to 30 years after simulated fire, but they had a persistently negative effect throughout the 30-year period in the absence of fire. We conclude that fuels-reduction treatments in the Sierra Nevada may provide long-term benefits to spotted owls if fire occurs under extreme weather conditions, but can have long-term negative effects on owls if fire does not occur. However, we only simulated one fire under the treated and untreated scenarios and therefore had no measures of variation and uncertainty. In addition, the net benefits of fuels treatments on spotted owl habitat and demography depends on the future probability that fire will occur under similar weather and ignition conditions, and such probabilities remain difficult to quantify. Therefore, we recommend a landscape approach that restricts timber harvest within territory core areas of use (similar to 125 ha in size) that contain critical owl nesting and roosting habitat and locates fuels treatments in the surrounding areas to reduce the potential for high-severity fire in territory core areas.
Details
- Title: Subtitle
- Evaluating short- and long-term impacts of fuels treatments and simulated wildfire on an old-forest species
- Creators
- Douglas J. Tempel - University of Wisconsin–MadisonR. J. Gutierrez - University of MinnesotaJohn J. Battles - University of California, BerkeleyDanny L. Fry - University of California, BerkeleyYanjun Su - University of California, MercedQinghua Guo - University of California, MercedMatthew J. Reetz - University of Wisconsin–MadisonSheila A. Whitmore - University of Wisconsin–MadisonGavin M. Jones - University of Wisconsin–MadisonBrandon M. Collins - Pacific Southwest Research StationScott L. Stephens - University of California, BerkeleyMaggi Kelly - University of California, BerkeleyWilliam J. Berigan - University of Wisconsin–MadisonM. Zachariah Peery - University of Wisconsin–Madison
- Resource Type
- Journal article
- Publication Details
- Ecosphere (Washington, D.C), Vol.6(12), pp.1-18
- DOI
- 10.1890/ES15-00234.1
- ISSN
- 2150-8925
- eISSN
- 2150-8925
- Publisher
- Wiley
- Number of pages
- 19
- Grant note
- California Department of Fish and Protection USDA Forest Service Region 5 California Department of Water Resources 1339015 / Division Of Earth Sciences; Directorate For Geosciences; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO) Sierra Nevada Conservancy MN-41036 / University of Minnesota's Agriculture Experiment Station Project USDA Forest Service Pacific Southwest Research Station; United States Department of Agriculture (USDA); United States Forest Service University of California; University of California System University of Minnesota; University of Minnesota System US Fish and Wildlife Service; US Fish & Wildlife Service
- Language
- English
- Date published
- 12/01/2015
- Academic Unit
- School of Earth, Environment, and Sustainability
- Record Identifier
- 9985219857802771
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