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Webinar recording.
Over the last 30 years, in woodland and forested ecosystems across the southwestern US, there has been an increasing trend in fire activity. Altered land use practices and more recent changes in precipitation patterns and warmer temperatures are widely thought to contribute to departures in fire regimes toward more frequent and larger fires with more extreme fire behavior that threatens the persistence of the various forested ecosystems. We examined climate-fire relationships in these vegetation types in Arizona and New Mexico using an expanded satellite-derived burn severity dataset that incorporates over one million additional burned hectares analyzed as extended assessments to the MTBS project’s data and five climate variables from PRISM. Climate-fire relationships were identified by comparing annual total area burned, area burned at high/low severity, and percent high severity regionally with fire season (May-August) and water year (October-September) temperature, precipitation, and vapor pressure deficit (VPD) variables. The high severity indicators were also derived for each fire individually to see if climate-fire relationships persist at the scale of the individual fire. Increasing trends toward more arid conditions were observed in all but two of the climate variables. Furthermore, VPD-fire correlations were consistently as strong or more correlated compared to temperature or precipitation indicators alone, both regionally and at the scale of the individual fire. Thus, our results support the use of VPD as a more comprehensive climate metric than temperature or other water-balance measures to predict future fire activity. Managers will have to face the implications of increasing high severity fire as trends in climate toward warmer and drier conditions become an increasingly dominant factor in driving fire regimes towards longer and more intense fire seasons across the Southwest.
After the Flames Science Session Recordings
Post-fire science needs for emergency response hazards and rehabilitation: An online opportunity to discuss the state of post-fire science and identify future needs was designed to:
- Assess science needs and barriers to communication of post-fire science
- Determine communication strategies for post-fire science
- Develop pathways forward for working together in post-fire response
Forum webpage.
This year’s forum will be held in Boise, ID with a symposium on October 5 and a field tour on October 6.
Webinar recording.
Webinar sessions will be half presentation and half question and answer. All presenters are scientists at the Rocky Mountain Research Station.
View report.
Mixed severity wildfires burn large areas in western North America forest ecosystems in most years and this is expected to continue or increase with climate change. Little is understood about vegetation recovery and changing fuel conditions more than a decade post-fire because it exceeds the duration of most studies of fire effects. We measured plant species composition, conifer seedling regeneration, fuel loads, and ground cover at 15 wildfires that burned 9-15 years previous in five western U.S. vegetation types distributed across eight states including Alaska.
Improve sampling plans by using propensity score matching to remove restoration trial selection bias
View article.
Failure to consider the non-random and selective deployment of restoration treatments by managers leads to faulty inference on their effectiveness. However, tools such as propensity-score matching can be used to remove the bias from analyses of the outcomes of management trials or to devise sampling plans that efficiently protect against the bias.
View report.
Today, American conservation confronts the climate crisis, the biodiversity crisis, a global pandemic, skeptics of these threats, a massive federal deficit, economic hardship, social injustice, and political divisions that threaten our democracy. Yet, at the same time, people continue to explore new ways to work together to use science, collaboration, and innovation to advance efforts to protect our environment, conserve our natural resource legacy, and broaden its benefits for all Americans.
View webinar recording.
In this webinar, Frank Lake, Research Ecologist with the Pacific Southwest Research Station will present findings from workshops held in 2012 and 2014 to investigate how traditional and western knowledge can be used to enhance wildland fire and fuels management and research. The workshops engaged tribal members, managers, and researchers to identify challenges and formulate solutions regarding cross-jurisdictional work, fuel reduction strategies, and wildland fire management and research involving lands important to tribes. A key conclusion from the workshops is that successful management of wildland fire and fuels requires collaborative partnerships that share traditional and western fire knowledge through culturally sensitive consultation, coordination, and communication for building trust. Dr. Lake will present a framework for developing these partnerships based on workshop discussions.
The ecological effects of wildland fire – also termed the fire severity – are often highly heterogeneous in space and time. This heterogeneity is a result of spatial variability in factors such as fuel, topography, and climate (e.g. a map of mean annual temperature). However, temporally variable factors such as daily weather and climatic extremes (e.g. an unusually warm year) also may play a key role. We conducted a study in which statistical models were produced describing fire severity as a function of live fuel, topography, climate, and fire weather. On average, live fuel was the most influential factor driving fire severity, followed by fire weather, climate, and topography. The statistical models we produced were then used to generate maps depicting the probability of high-severity fire, if a fire were to occur, for several ecoregions in the western US. These maps can potentially be used by land management agencies to prioritize hazardous fuel reduction treatments. This webinar pertains to all mountainous regions of the western US but will slightly emphasize the southwestern US.
Visit the RTEC website.
The Rangeland Technology and Equipment Council (RTEC) is an informal organization of land managers, engineers, researchers, academics, and private industry representatives interested in developing new rehabilitation equipment and strategies.