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S That Tree Dead? Quantifying Fire-Killed Trees to Inform Salvage and Forest Management

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S That Tree Dead? Quantifying Fire-Killed Trees to Inform Salvage and Forest Management United States Department of Agriculture Rocky Mountain Research Station Science You Can Use Bulletin SEPTEMBER 2019 | Issue 36 Is That Tree Dead? Quantifying Fire-Killed Trees to Inform Salvage and Forest Management In fire-dependent forests of the SUMMARY western United States, tree species adapt in several ways to survive Wildfires are natural disturbances in fire. In low-elevation forests that the western United States. Managing evolved with frequent, low-severity the resulting stands of dead and fire, many species have thick dying trees requires balancing bark protecting the living tissues conflicting priorities. Although these trees provide wildlife habitat and of cambium and phloem from salvage logging revenue, they also wildfires’ destructive heat. Longer, pose public safety hazards. thicker needles or those enclosed in One criticism of salvage logging is thick scales protect growing buds. that forest managers may overpredict Some tree species even shed their tree mortality and remove trees lower branches, which reduces the that will recover from their wildfire injuries. Sharon Hood, a research chance of fire climbing into their ecologist with the Rocky Mountain crowns. Still other tree species are Research Station, has studied tree easily killed by fire but can readily mortality following wildfires to identify resprout, or their seeds survive characteristics of fire injuries that will result in tree death. Through to quickly regenerate burned her research over the past decade, areas. Collectively, these adaptive she has improved the First Order measures allow species survival in Fire Effects Model (FOFEM), a modeling tool that forest managers fire-prone areas. However, high- can use to predict tree mortality intensity wildfires can generate and subsequently plan for salvage temperatures that overwhelm a and other management activities. In tree’s adaptations to survive fire. addition, she has collaborated with the U.S. Forest Service Northern The result: thousands of acres of Although wildfires are a natural disturbance in the western United States, their Region (1) and the Pacific Southwest Federal, Tribal, State, and private frequency is expected to increase because Region (5) staff to develop post-fire forests filled with trees having of climate change. The challenge for land tree-marking guidelines to assist charred bark and burned crowns. managers is how to manage an increasing timber-marking crews laying out number of acres comprised of dead, dying, salvage sales. By adopting similar And the sight can be distressing. and living trees. The First Order Fire Effects tree-marking guidelines through the Model is one of several tools used by the use of FOFEM, forest managers can U.S. Forest Service to model post-fire tree improve the efficiency, consistency, “People aren’t used to looking at mortality for planning prescribed fires and and transparency of salvage logging burned trees,” explains Sharon predicting wildfire severity (photo: U.S. projects. Hood, a research ecologist with Forest Service). 1 Forest Service Rocky Mountain Research Station Science You Can Use Bulletin September 2019 | Issue 36 Modeling Software Helps Land Managers Make Decisions Wildfire can injure a tree by burning its crown, charring its bark, flame length and intensity needed to kill trees of some species or killing its roots. The severity of these injuries, subsequent and size classes or to not kill desirable species of some attacks by bark beetles, and environmental conditions such as size classes); scenario planning to decide the most effective drought, will determine if the tree lives or dies. The First-Order prescribed fire treatment option; and anticipating which trees Fire Effects Model (FOFEM), BehavePlus, and FFE-FVS are will die after a fire to model future forest species composition free modeling software programs used by land managers to and structure (useful when estimating carbon stores and estimate the probability of mortality from these wildfire injuries. snags for wildlife over time). This helps managers as they design salvage logging projects and other post-fire management activities. FOFEM: https://www.firelab.org/project/fofem. BehavePlus: https://www.frames.gov/behaveplus/home. These programs are also invaluable for developing prescribed fire plans to meet mortality-related objectives (such as the FFE-FVS: https://www.firelab.org/project/ffe-fvs. How Fire Impacts Trees Radiation Convection Conduction and Flames consume smoldering Bole heating live needles and combustion and charring kill buds Crown scorch and bud kill via convective or radiative heat Crown scorch with bud survival via convective or radiative heat Thin bark privides Soil heating and Thick bark little insulation root injury insulates Heat is transferred to living tissues of trees during fire (top panel), resulting in injuries to different parts of trees after fire (bottom panel). Fire causes injuries to different parts of trees—buds, foliage, cambium in the stem, and roots—through different heat transfer processes. To learn more about the heat transfer process, read the publication Fire and tree death: understanding and improving modeling of fire-induced tree mortality (also found in Further Reading list on page 10) (graphics by R. Van Pelt). 2 Forest Service Rocky Mountain Research Station Science You Can Use Bulletin September 2019 | Issue 36 the Rocky Mountain Research Station (RMRS). “Right after a fire, MANAGEMENT IMPLICATIONS everything tends to look worse ● A warming climate is expected to result in increases in wildfires and beetle than it is, and you’d think that all outbreaks, which means forest managers will have to balance multiple objectives those trees will die. Yet if you wait when managing the post-wildfire landscape, such as whether to conduct salvage a year, things often look better.” logging, how best to reduce erosion, regeneration priorities, and providing wildlife habitat. The landscape does recover. Burnt ● The First Order Fire Effects Model is free modeling software that managers can needles fall off and are replaced use to model post-fire tree mortality, both for planning prescribed burns and for predicting wildfire severity. by the emergence of new needles. ● When the U.S. Forest Service Northern Region (1) and Pacific Southwest Region Understory vegetation takes (5) developed scientifically defensible tree-mortality guidelines, it provided advantage of the open canopy transparency in how trees are marked for salvage. The guidelines continue to conditions, and the burned area help streamline the NEPA process and approval of the salvage sales. greens up. Trees that survive their ● Tree mortality guidelines can be customized for a specific region and include injuries are seed sources for the a probability scale for the likelihood of tree death. This provides users an next cohort of trees. However, opportunity to apply a different probability of mortality depending upon the situation when making management decisions. many trees do not survive. They ● Although there is a spike in beetle-related tree mortality following a wildfire, may die soon after the fire is the spike is temporary, and the bark beetle attacks don’t persist or expand into extinguished, because their crowns adjacent unburned areas. were extensively burned or the heat penetrated the bark to kill the cambium. Other trees may die diminishes quickly over time. several years later as they exhaust Management decisions Salvage logging generates economic their energy reserves trying to such as whether and returns to rural and natural recover from their injuries. resource-dependent communities where to conduct adjacent to National Forests and salvage logging must The challenge for forest managers facilitates reforestation efforts. be made promptly is how to manage a forest that is a mosaic of live, dead, and following a wildfire. Since management decisions such dying trees, because species Forest managers as whether and where to conduct respond to fire differently and salvage logging must be made cannot afford to there are conflicting priorities. promptly following a wildfire, wait several years to The newly dead and dying forest managers cannot afford to trees create desirable habitat observe which trees wait several years to observe which for threatened and endangered die, which is where trees die—which is where modeling species and disturbance-associated modeling is useful to is useful to predict post-fire tree species, such as cavity-dwelling mortality. predict post-fire tree woodpeckers. However, standing mortality. dead trees are a public safety hazard for agency personnel and planting contractors working in the area, as well as members of the public hiking through a burn scar. Trees that have recently died also have commercial value, which Photo: U.S. Forest Service 3 Forest Service Rocky Mountain Research Station Science You Can Use Bulletin September 2019 | Issue 36 Building Trust Through States. According to Hood, field- trying to cut more trees than Improved Tree Mortality collected data isn’t available for necessary. On the other hand, if Modeling 150 species of these 219 species, you’re underpredicting mortality, The First Order Fire Effects which means the models may be then many dying trees will be left.” Model (FOFEM) is one of several overpredicting or underpredicting free software programs used mortality depending upon the In California, in particular, by the USDA Forest Service and tree species. This uncertainty is forest managers observed a other
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