Fact Sheet / Brief
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Researchers measured 14 transects across two different fuel treatment types on three different units. For both fuel treatment types, only ladder fuels had been removed. They found that while severity was reduced at all sites, the spatial distribution of fire severity within the treatment areas varied by treatment type and unit as well as which fire severity metric they were analyzing. They found fuel treatments reduced fire severity anywhere from -7 m to 533 m into the treatment area. Kennedy and Johnson (2014) caution that local site conditions, topography and vegetation type will be other sources of variation in fire severity.
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U.S. Geological Survey scientists analyzed a collection of climate, fire and erosion models for 471 large watersheds throughout the western U.S. They found that by 2050, the amount of sediment in more than one-third of watersheds could at least double. In nearly nine-tenths of the watersheds, sedimentation is projected to increase by more than 10 percent.
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This brief summarizes work by researchers who modeled exactly how problematic the grass-fire cycle could be for non-fire-adapted desert shrublands under three sets of climate conditions. Specifically, three different degrees of inter-annual precipitation variability (i.e., none, medium, and extreme climate change variability; sigma = 0 to 0.8) and related invasive grass cover biomass was modeled to theoretically induce land degradation.
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This study examined bark beetle mortality for two-years after fuel reduction treatment in mid-elevation mixed conifer forests at the University of California Blodgett Research Forest. As part of the National Fire and Fire Surrogate Study, the experimental treatments included prescribed fire (fire), mastication, the combination of the two, and a control.
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Fire is a strong driver of changes in montane forest structure in California’s Sierra Nevada and southern Cascade mountain ranges, which provide much of the snowpack and associated water storage for the state of California. A recent study by Stevens presented one of the first direct investigations in California of how fire can influence snowpack depth.
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The CONSERVATION EFFORTS DATABASE (CED) was codeveloped by the U.S. Fish and Wildlife Service (USFWS), the U.S. Geological Survey (USGS), and the Great Northern Landscape Conservation Cooperative (GNLCC):
- USFWS provided a comprehensive ecological assessment separated by threats and efforts, and database structure based on user needs.
- USGS provided database and website design expertise building off of the Land Treatment Digital Library.
- GNLCC provided ecological, database, and GIS expertise, greatly enhancing CED capabilities.
Many state and federal partners provided input and feedback, ranging from design recommendations to policy sideboards, ensuring the CED has broad applicability and interoperability.
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This bulletin summarizes the evaluation of more than 40 years of satellite imagery to determine what happens when a fire burns into a previously burned area. Results from this research are helping land managers to assess whether a previous wildland fire will act as a fuel treatment based on the length of time since the previous fire and local conditions such as ecosystem type, topography, and fire weather conditions. By factoring in the ecological benefits of fire, land managers are able to manage fire in a way that fosters more resilient landscapes.
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This brief highlights sustainable grazing practices and sagebrush treatments that enhanced herbaceous understory for sage grouse in years with average winters, but populations declined following severe winters. Sage grouse populations on the Deseret Land and Livestock (DLL) ranch increased for nearly 15 years when the ranch coupled deferred rest rotation grazing with small sagebrush removal projects. Birds responded positively as evidenced by lek counts that were higher and more stable on DLL than in nearby northeast Utah and western Wyoming. Total sagebrush removal cumulatively modified approximately 15% of DLL’s sage grouse habitat as individual small scale projects added up through time. Lek counts on DLL declined on the ranch and elsewhere following extreme winter and spring conditions. The cumulative effects of sagebrush removal may have contributed to declines on DLL due to less sagebrush food and cover for birds during severe weather.
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In this work, researchers examined understory plant community responses to ecological restoration treatments at two pinyon-juniper woodland sites in northwestern Arizona. We asked the following questions: 1) do restoration treatments, that include tree thinning prescriptions guided by reference conditions, scattering thinning slash, and seeding, lead to increases in plant cover and species richness; and 2) how do understory responses differ across sites with contrasting soils characteristics?
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The bulletin highlights landscape exposure to multiple stressors can pose risks to human health, biodiversity, and ecosystem services. Attempts to study, control, or mitigate these stressors can strain public and private budgets. An interdisciplinary team of Pacific Northwest Research Station and Oregon State University scientists created maps of the conterminous United States that indicate landscape exposure to concentrated wildfire potential, insects and disease risk, urban and exurban development (note this is housing development only, not energy development), and climate change. The maps, which show where these stressors might occur and overlap, provide a valuable resource for regional and national land use, land management, and policymaking efforts by helping to guide resource prioritization.