Research and Publications
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Increasing wildfire size and severity across the western United States has created an environmental and social crisis that must be approached from a transdisciplinary perspective. Climate change and more than a century of fire exclusion and wildfire suppression have led to contemporary wildfires with more severe environmental impacts and human smoke exposure. Wildfires increase smoke exposure for broad swaths of the US population, though outdoor workers and socially disadvantaged groups with limited adaptive capacity can be disproportionally exposed. Exposure to wildfire smoke is associated with a range of health impacts in children and adults, including exacerbation of existing respiratory diseases such as asthma and chronic obstructive pulmonary disease, worse birth outcomes, and cardiovascular events. Seasonally dry forests in Washington, Oregon, and California can benefit from ecological restoration as a way to adapt forests to climate change and reduce smoke impacts on affected communities.
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Wildfire risk, species conservation, and ecosystem management all depend on seamless spatial data. LANDFIRE may already be supporting your mission if you have ever asked questions like these:
- What is the wildfire risk within a particular landscape?
- Where can I get data to evaluate fauna habitats?
- If ignited, how might a wildfire move through a particular landscape?
- How does the vegetation cover in one area compare with the vegetation in another area?
- How have disturbances in the past affected current forest conditions?
- What is the spatial distribution of a certain vegetation type?
- Where can I find spatial vegetation and structure data for all lands, regardless of ownership?
National LANDFIRE datasets can help answer all these questions for areas of interest within the United States and insular areas at the 30-meter pixel level. LANDFIRE is a Federal program that provides a suite of spatial datasets indicating areas of disturbance, vegetation and fuels distributions and structure, and historical conditions. Although LANDFIRE is the definitive dataset used by the interagency fire community for surface and canopy fuels, the program also maps more than 30 spatial datasets that can be used for a variety of purposes.
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This study quantifies the climate drivers that influence wildfire and climate stress-driven tree mortality, including a separate insect-driven tree mortality, for the contiguous United States for current (1984–2018) and project these future disturbance risks over the 21st century. We find that current risks are widespread and projected to increase across different emissions scenarios by a factor of >4 for fire and >1.3 for climate-stress mortality. These forest disturbance risks highlight pervasive climate-sensitive disturbance impacts on US forests and raise questions about the risk management approach taken by forest carbon offset policies. Our results provide US-wide risk maps of key climate-sensitive disturbances for improving carbon cycle modeling, conservation and climate policy.
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In developing this report, a cross-functional group of stakeholders and subject matter experts (SMEs) from across the nation convened to identify 33 challenges within 13 key WUI issues and develop recommendations to address each challenge. In total, 112 recommendations are presented. These recommendations address challenges in firefighter health and safety, public health and safety, evacuations, forest and rangeland health and resiliency, climate change, community planning and resiliency, infrastructure and utilities, communication strategy and engagement operations, socioeconomic impacts, recovery, emerging technology, data use and modeling, and risk management in wildland fire. The recommendations should be pursued together, forming a system of strategies that require urgent, sustained and actionable implementations. These recommendations are not quick fixes, but solutions for the long term. Leadership on and commitment to the implementation of these recommendations results in a safer America.
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For wildfire risk mapping and for general purposes, WUI maps based on the 500-m neighborhood represent the original Federal Register definition of the WUI; these maps include clusters of buildings in and adjacent to wildlands and exclude remote, isolated buildings. Our approach for mapping the WUI offers flexibility and high spatial detail and can be widely applied to take advantage of the growing availability of high-resolution building footprint data sets and classification methods.
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Climate-driven changes in global temperatures and aridity are directly correlated with the decreasing interval between high-elevation fires. Fire activity is increasingly disproportionate at higher elevations than that of lower elevation forests in the Western United States. Studies documented an upslope advance of high-elevation fires of roughly 7.6 m (25 ft) per year. An additional 81,500 km2 (31,500 miles2) of the western United States forested regions were exposed to fires due to increased aridity between 1984 and 2017.
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Studies show that effective strategies to mitigate the risk of structural damage in wildfires include defensible spaces and home hardening. Structures in the western United States are especially at risk. Several jurisdictions have adopted codes that require implementation of these strategies. However, construction and landscaping professionals are generally not required to obtain credentials indicating their competency in mitigating the risk of structural damage in a wildfire. We discuss the implications of this policy gap and propose a solution to bolster competency of professionals in wildfire protection as communities further expand in fire-prone areas.
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Novel rangeland fractional cover data enabled large-scale assessment of fire impacts. Timing in responses to rangeland wildfires differ among plant functional types. High severity wildfires led to the largest cover decrease of plant functional types. Moist prefire conditions led to greater decreases in herbaceous cover. Dry prefire conditions resulted in greater decreases in woody cover.
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Invasive annual grasses, wildfire, and climate change are changing ecosystem processes in the sagebrush biome at a pace and scale requiring an assessment of where processes can be saved, where they can be regained, and where they are lost. Confronting these threats is the primary focus of restoration and management efforts, guiding policy creation, project prioritization, and action on the ground. The new Defend the Core framework helps land managers, landowners, and policy makers to use the tools or management actions most likely to improve conditions.
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Collaborating at the planning stage of restoration projects can be slow. It takes time to build relationships, and meeting people “where they are at” is often the accomplishment. Success in collaboration comes from gathering the local knowledge to move forward with implementing projects. Long-standing collaborative groups often face challenges with keeping stakeholders and partners involved particularly when tracking past projects. Finding continued funding to maintain the projects implemented years earlier takes effort usually on behalf of the convening organization.