JFSP Fire Science Exchange Network
Although fuels treatments are generally shown to be effective at reducing fire severity, there is widespread interest in monitoring that efficacy as the climate continues to warm and the incidence of extreme fire weather increases. This paper compared basal area mortality across adjacent treated and untreated sites in the 2021 Dixie Fire of California’s Sierra Nevada.
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Read MoreIdentification and conservation of mature and old-growth forests has become a federal government priority. In California’s Sierra Nevada’s most of the remaining large trees are concentrated on Forest Service and National Park Service lands. We used airborne lidar data to census large (≥30” diameter at breast height (DBH)) and very large (≥40”) trees across three large Sierra landscapes. We found that large trees are either locally absent to rare or are aggregated in stands with 8-20 large trees per acre.
Read MoreThis study explores the effects of historical logging on tree regeneration and successive effects on stand development under a history of fire exclusion. The authors leveraged a silvicultural experiment from the 1920s in the Sierra Nevada mixed-conifer forest of the Stanislaus-Tuolumne Experimental Forest to test if silvicultural objectives of increasing pine stocking rates were met. Combining historical (pre- and post-logging in 1928-1929) and contemporary tree regeneration data along with overstory and microsite conditions, they assessed the impact of logging on pine decline.
Read MoreThis paper examines a 20-year forest restoration study in the northern Sierra Nevada looking at changes in forest structure and composition, fuel accumulation, modeled fire behavior, intertree competition, and economics resulting from four treatment regimes: multiple applications of prescribed fire (Fire), multiple mechanical restoration thinnings (Mech), multiple mechanical restoration thinnings followed by prescribed fire (Mech + Fire), and untreated controls
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Read MoreThis study analyzes tree death in Yosemite National Park and Sequoia/Kings Canyon National Park following the 2012-2016 drought.
Read MoreThis study analyzes data from a mixed-severity fire in the northern range of coast redwood to create a model for predicting postfire response of four redwood community plants.Mastication, thinning, and prescribed fire can help shift fire-prone forests to a structure more resilient to fire and other disturbances. However, the ability to evaluate treatment effectiveness requires long-term monitoring of forest responses to disturbances and assessing changes in fuel loadings and structure. Researchers from Michigan State University and the USFS Fire Behavior Assessment Team remeasured a ponderosa pine forest 13 years after a combination of treatments were implemented: no treatment/control (C), mastication (M), mastication + burn (MB), and mastication + pull back of surface fuels + burn (MPB).
Read MoreResearchers from Michigan State University and the USFS Fire Behavior Assessment Team used 15 years of immediate pre- and post-fire fuel and wildfire behavior data to identify the role of fire advancement mode and pre-fire environmental drivers (e.g., topography, fire weather, and fuel loadings) on fuel consumption and fire effects in California mixed-conifer forests.
Read MoreThis report compiles research on fuel conditions, fire history, and fire effects data from contemporary wildfires to provide context for the future management of old growth coast redwood stands and restoration of old growth attributes in second growth forests. The report also investigates fire hazards present in redwood forests and their fire management implications.
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Read MoreThis study leveraged data collected from 20-year-old forest monitoring plots within fuel treatment units that captured a range of wildfire occurrence (i.e., not burned, burned once, or burned twice) following application of initial thinning treatments and prescribed fire.
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Read MoreThis synthesis summarizes the relevance of targeted grazing for fuel reduction and ecosystem resilience and discusses some of its primary applications and limitations.
Read MoreThis paper summarizes important outcomes of the 2020 fire year in California and discusses what we can learn from them.
Read MoreThis paper argues that the expansion of prescribed fire will require new public policies that both protect burn practitioners from liability and compensate for losses from potential fire escapes.
Read MoreIn dry frequent-fire forests of the western US, forest restoration goals are often focused on promoting resilience to disturbances. This brief highlights ways to manage dry western forests for improved resilience.
Read MoreWith narrowing and potentially non-existent opportunities during other times of year, winter may currently be the most realistic and advantageous time to conduct prescribed burns. This study evaluated the effectiveness and feasibility of winter burning to demonstrate its potential utility in mixed conifer forests.
Read MoreThis study measured wildland fuels (shrubs, downed logs, and fine woody debris) eleven years after high-severity fire converted a Sierra mixed-conifer forest to shrub-dominant vegetation. The findings of this study suggest that site preparation and vegetation control is an effective tool to reduce fuel loads and continuity of live and downed woody fuels in early seral environments created by high-severity fire.
Read MoreThis paper suggests pyrosilviculture, a combination of mechanical treatments and prescribed fire and/or managed wildfire, can be used strategically to modify future wildfires at larger spatial scales.
Read MoreIn this study, the authors integrated archival federal (FACTS) and state (CAL FIRE) forest activity databases dating from 1984 to 2019, analyzed current and historic management trends, and evaluated the archival record’s spatial accuracy against remotely sensed data. California’s progress toward the 1-million-acres of annually treated land is currently at 30%.
Read MoreDo fuel reduction treatments result in restored conditions that align with those found in historically frequent-fire forests of the west? A recent paper sets out to answer that question by examining the principles behind fuel reduction and forest restoration projects and identifying situations where the two approaches align and where they may diverge.
Read MoreThis article uses field data from two wildfires (the 2015 Rough Fire and 2016 Cedar Fire) that burned in areas of recent severe tree mortality to examine whether and under what conditions the pre-fire tree mortality affected wildfire severity.
Read MoreThis study compares the costs of prescribed fire and thinning treatments while putting treatment costs in the context of treatment effectiveness.
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The California Fire Science Consortium is divided into 4 geographic regions and 1 wildland-urban interface (WUI) team. Statewide coordination of this program is based at UC Berkeley.
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This regional Fire Science Exchange is one of 15 regional fire science exchanges sponsored by Joint Fire Science Program (JFSP).
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