Fuels & Fuel Treatments
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Effective wildlife management requires robust information regarding population status, habitat requirements, and likely responses to changing resource conditions. Single-species management may inadequately conserve communities and result in undesired effects to non-target species. Thus, management can benefit from understanding habitat relationships for multiple species. Pinyon pine and juniper are expanding into sagebrush-dominated ecosystems within North America and mechanical removal of these trees is frequently conducted to restore sagebrush ecosystems and recover greater sage-grouse. However, pinyon-juniper removal effects on non-target species are poorly understood, and changing pinyon-juniper woodland dynamics, climate, and anthropogenic development may obscure conservation priorities. To better predict responses to changing resource conditions, evaluate non-target effects of pinyon-juniper removal, prioritize species for conservation, and inform species recovery within pinyon-juniper and sagebrush ecosystems, we modeled population trends and density-habitat relationships for four sagebrush-associated, four pinyon-juniper-associated, and three generalist songbird species with respect to these ecosystems. We fit hierarchical population models to point count data collected throughout the western United States from 2008 to 2020. We found regional population changes for 10 of 11 species investigated; 6 of which increased in the highest elevation region of our study. Our models indicate pinyon-juniper removal will benefit Brewer’s sparrow, green-tailed towhee, and sage thrasher densities. Conversely, we predict largest negative effects of pinyon-juniper removal for species occupying early successional pinyon-juniper woodlands: Bewick’s wren, black-throated gray warblers, gray flycatcher, and juniper titmouse. Our results highlight the importance of considering effects to non-target species before implementing large-scale habitat manipulations. Our modeling framework can help prioritize species and regions for conservation action, infer effects of management interventions and a changing environment on wildlife, and help land managers balance habitat requirements across ecosystems.
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Sagebrush shrublands in the Great Basin, USA, are experiencing widespread increases in wildfire size and area burned resulting in new policies and funding to implement fuel treatments. However, we lack the spatial data needed to optimize the types and locations of fuel treatments across large landscapes and mitigate fire risk. To address this, we developed treatment response groups (TRGs)—sagebrush and pinyon-juniper vegetation associations that differ in resilience to fire and resistance to annual grass invasion (R&R) and thus responses to fuel treatments.
Webinar recording.
Missoula Fire Sciences Lab Seminar Series
Nov 9 2023
Presenter: Dan Jimenez, RMRS Research Engineer
In the southwestern United States, non-native grass invasions have increased wildfire occurrence in deserts and the likelihood of fire spread to and from other biomes. Wildfires were historically small and infrequent in the warm deserts of western North America, with minimal impact on the desert vegetation. In recent decades, the fire regime has shifted with the spread of non-native grasses. Fires are increasingly burning large areas in desert habitats, largely driven by grassification, the physiognomic conversion of shrublands to grassland by non-native grass invasions. This conversion is especially concentrated at the upper elevational and northern latitudinal boundaries of the Sonoran Desert, which are transition zones to adjacent fire-prone biomes.
Catastrophic wildfires in the western United States pose significant risks to public health, infrastructure, and ecosystems. As these wildfires become more frequent, there is a growing need for a common methodology to identify suitable locations for prescribed burning aimed at mitigating future wildfire impacts to affected populations and ecosystems. This presentation explores the use of atmospheric chemistry transport modeling, satellite observations, and data from land managers to assess the effectiveness of prescribed burning interventions in reducing potential future wildfire smoke exposure. The presenter will offer lessons for states and rural environmental justice communities through a discussion on how implementing preventative prescribed burns in heavily forested areas such as Northern California and the Pacific Northwest may yield substantial net benefits for air quality across the entire western US, while similar interventions in other states would result in comparatively smaller impacts.
Webinar recording.
A practitioner-oriented overview of LANDFIRE with a focus on fuels and how they react to modeling techniques. The subject area of discussion will be the 2022 Cooks Peak fire located in northern New Mexico. This webinar will be technical in its application and may offer insights for both beginner and advanced LANDFIRE users.
Presenters: Tobin Smail, LANDFIRE Next Gen Fuels Lead, USFS Rocky Mountain Research Station Fire Modeling Institute; and Charley Martin, LANDFIRE Fuels, TSSC Contract USGS/KBR
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Here, we quantify observed and projected trends in the frequency and seasonality of western United States prescribed fire days. We find that while ~2 C of global warming by 2060 will reduce such days overall (−17%), particularly during spring (−25%) and summer (−31%), winter (+4%) may increasingly emerge as a comparatively favorable window for prescribed fire especially in northern states.
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This study found prescribed fire used to control woody encroachment had lower maximum spot-fire distances compared to wildfires and, correspondingly, a lower amount of land area at risk to spot-fire occurrence. Under more extreme wildfire scenarios, spot-fire distances were 2 times higher in grasslands, and over 3 times higher in encroached grasslands and Juniperus woodlands compared to fires burned under prescribed fire conditions. Maximum spot-fire distance was 450% greater in Juniperus woodlands compared to grasslands and exposed an additional 14,000 ha of receptive fuels, on average, to spot-fire occurrence within the Loess Canyons Experimental Landscape. This study demonstrates that woody encroachment drastically increases risks associated with wildfire, and that spot fire distances associated with woody encroachment are much lower in prescribed fires used to control woody encroachment compared to wildfires.
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While prescribed fire and mechanical treatments in shrublands experiencing tree expansion restored understory vegetation and prevented continued juniper and pinyon infilling and growth, these fuel treatments also increased modeled surface fire behavior. Thus, management tradeoffs occur between desired future vegetation and wildfire risk after fuel treatments.
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It’s been a weird year so far. The west experienced an exceptionally cool and moist spring, especially in the southern extent of the region. Combined with above average snowpack, fuels stayed moist, and the fire season has had a very slow start. In fact, June saw the lowest area burned since 2000, but despite the slow start over 400 locations in the conterminous US have experienced record temperatures. Moreover, we have seen several weeks of anomalous heat waves, especially in the southwestern US. Yet still the fire season is slower than normal, but fuels are drying out fast.
In this 22-minute webcast, Research Ecologist Dr. Matt Reeves analyzes rangeland fuel conditions across the western US by evaluating the main factors of fuel amount and type, proximity to larger diameter fuel, drought conditions, and level of curing leading to senescent grasses in our simple but transparent hotspot algorithm. All 2022 recordings are located on the Reading the Tea Leaves page.