Quickly planting trees after wildfires crucial for communities, ecosystems, carbon goals
As the climate crisis fuels more high-severity wildfires, many forests – adapted to bounce back from frequent but less-intense fires – are struggling to recover quickly.
“In a lot of locations, forests in the Sierra Nevada that burn at high severity are not regenerating on their own,” said Susie Kocher, University of California Cooperative Extension forestry and natural resources advisor for the Central Sierra. “They need to have living trees to drop seeds; if everything dies in an intense fire, then there's a high likelihood in those locations that trees might not return for a while.”
According to Kocher, a forest may take multiple decades to grow back on its own, seeding in very slowly from the edges of a burn. To speed up that regeneration process, a pilot program of local “Emergency Forest Restoration Teams,” or EFRTs, have been helping forest landowners rapidly remove dead trees, plant new seedlings and expedite other vital tasks after wildfires.
Kocher is a co-author of a recently released report evaluating the EFRTs, which appear to be effective in assisting often-overwhelmed private landowners navigate competitive funding programs and complicated permitting pathways after wildfire. Small private landowners in California own 7 million acres, comprising 22% of forested land across the state.
“None of our current assistance programs were really designed to rapidly respond to high-severity fire disasters,” Kocher said. “And we're just getting so much more high-severity fire now that there needed to be a different way of helping people, besides business as usual.”
Lead agencies improve coordination of restoration efforts
Drawing from a successful model in Washington, Kocher and other members of the Governor's Forest Management Task Force recommended the formation of EFRTs in 2019 and this recommendation made it into the California Wildfire and Forest Resilience Action Plan of 2021.
Following the Caldor, Dixie and Tamarack fires during that year, disaster relief funds from CAL FIRE and the U.S. Forest Service enabled the establishment of pilot EFRTs in each of the affected regions. A key innovation was designating a local lead agency to coordinate restoration efforts: the El Dorado Resource Conservation District (Caldor), the Feather River Resource Conservation District (Dixie) and Alpine County (Tamarack).
“The idea is that one well-established local agency gets the funds to carry out all the reforestation work,” Kocher said. “They find contractors for the landowners and plan and carry out all the work needed, including dead tree removal, site preparation and replanting; this helps it be more coordinated across the landscape and reduces competition for contractors.”
“Also, for most of that work, there's no cost to the landowner – which is a huge benefit to them, because these things can get really expensive, like many thousands of dollars an acre,” Kocher added.
Although there was an initial steep learning curve for the local lead agencies on the complexities of reforestation and the maze of required permits, they quickly executed a significant number of forest restoration treatments. Within two years, the three pilot teams had collectively completed over 2,500 acres of dead tree removal and 1,400 acres of conifer planting.
“The overwhelming benefit of the pilots was that a lot of work got done on the ground, that otherwise would not have been done – at least not in the timeframe that was made possible by the EFRTs,” said Daylin Wade, a UCCE staff research associate and co-author of the recent report, who synthesized feedback from interviews of professionals involved in the program.
Both Wade and Kocher underscored how the EFRTs were crucial in completing restoration tasks in a timely manner. Removal of dead wood becomes trickier and more expensive over time, as the trees decay and are dangerous to cut down.
“A major accomplishment was getting trees out of there while it was both safe and economically viable to remove those trees – and getting trees in the ground before shrubs dominate the site,” Wade explained.
It's also imperative to quickly remove the dead trees to reduce the fuel load and minimize the chances of re-burn in the area.
“If you're not doing this work, then you're actually endangering the investment that you're putting into rebuilding communities that burned, because they're in danger of burning again if you have huge piles of dead trees everywhere,” Kocher said.
Furthermore, expediting those tasks helps restore the forest cover that is crucial for sequestering carbon and achieving the goals of California's sweeping climate action plan – such as attaining carbon neutrality by 2045.
“We have very ambitious carbon goals for our forests in California, and so reestablishing them – even on private lands – is a public benefit,” Kocher said.
Evaluation of EFRTs by UC Cooperative Extension continues
In addition to enumerating the progress of the three EFRT case studies, the evaluation report also lists recommendations to further enhance the program, such as securing rapid and flexible funding for future EFRTs, improving guidance for local lead agencies and streamlining permitting processes.
The authors also stressed the need to expand opportunities for the commercial sale of woody material in the aftermath of a wildfire event. Selling logs and wood chips reduces the volume of material that would need to processed onsite by the EFRTs and their contractors, thereby defraying some of the costs for that work.
But there simply hasn't been a sufficient market for that woody biomass.
“It's a big barrier,” Kocher said. “If we had a healthier timber market, it would be easier to make this stuff pay its own way and be less of a subsidized endeavor.”
UC Cooperative Extension's EFRT evaluation work – made possible by funding from the U.S. Forest Service State, Private and Tribal Forestry, Region 5 – will continue for the next couple years. On the heels of this first report, Wade will next gather and summarize feedback from private landowners on whether the EFRTs are meeting their goals.
And, later this summer and fall, researchers will begin assessing the ecological success of the plantings in the restoration areas, surveying seedling survival and gauging the volume of competing vegetation.
“It's hugely encouraging that we've gotten all these trees in the ground, but it's not the end of the process – it's just the beginning,” Kocher said. “Trees and forests need to be maintained over time, so this next step will let us see how successful that has been, and if there are additional steps needed to actually ensure that these trees succeed and thrive.”
The full report, dedicated to the memory of report co-author and UCCE advisor Ryan Tompkins, can be found at https://ucanr.edu/efrt.
In the aftermath of megafires that devastated forests of the western United States, attention turns to whether forests will regenerate on their own or not. Forest managers can now look to a newly enhanced, predictive mapping tool to learn where forests are likely to regenerate on their own and where replanting efforts may be beneficial.
The tool is described in a study published in the journal Ecological Applications by researchers from the University of California, Davis; U.S. Geological Survey (USGS), Cal Fire and the U.S. Forest Service.
“Huge fires are converting forested areas to landscapes devoid of living trees,” said lead author Joseph Stewart, a postdoctoral researcher at UC Davis and with USGS. “Managers need timely and accurate information on where reforestation efforts are needed most.”
The tool, also known as the Post-fire Spatial Conifer Regeneration Prediction Tool (POSCRPT), helps forest managers identify within weeks after a fire where sufficient natural tree regeneration is likely and where artificial planting of seedlings may be necessary to restore the most vulnerable areas of the forest.
Fewer conifers expected
Conifers, or plants with cones such as pine trees, dominate many forests in western North America. The study found that conifers are less likely to regenerate after fires when seedlings face drier climate conditions, especially in low-elevation forests that already experience frequent drought stress. Overall, fewer conifers are expected to grow in California's lower elevations following wildfire due to climate and drought conditions.
“We found that when forest fires are followed by drought, tree seedlings have a harder time, and the forest is less likely to come back,” said Stewart.
A UC Davis team collected post-fire recovery data from more than 1,200 study plots in 19 wildfires that burned between 2004 and 2012, as well as 18 years of forest seed production data. Ecologists at USGS collected and identified over 170,000 seeds from hundreds of seed traps. The scientists combined these data with multispectral satellite imagery, forest structure maps, climate and other environmental data to create spatial models of seed availability and regeneration probability for different groups of conifers, including pines and firs.
Forest managers have used a prototype of the tool in recent years to better understand where to focus regeneration efforts. The new upgrade incorporates information on post-fire climate and seed production and includes an easy-to-use web interface expected to increase the tool's accuracy and use.
“This work is a great example of how multiple partners can come together to solve major resource management problems that are arising from California's climate and fire trends,” said co-author Hugh Safford, regional ecologist for the USDA Forest Service's Pacific Southwest Region and a member of the research faculty at UC Davis.
Additional co-authors include Phillip van Mantgem, Adrian Das, Nathan Stephenson, Jon Keeley and Micah Wright of USGS; Derek Young and James Thorne of UC Davis; Kristen Shive of Save the Redwoods League; Haiganoush Preisler of U.S. Forest Service; and Kevin Welch of California Department of Forestry and Fire Protection.
The study was funded by the USGS' Southwest Climate Adaptation Science Center, Ecosystems Mission Area and Land Change Science Program.
The University of California Agriculture and Natural Resources (UCANR) publications office today announced the release of a new book, “Reforestation Practices for Conifers in California”, a practical manual for landowners and managers that explains the why, where, who, when, what, and how of getting sustainable forests back into California's diverse landscape. It is available now for immediate viewing and downloading for free on the Forest Vegetation Management Conference's website: www.fvmc.org. Next year the book will be published in full color print and web format by
“The primary takeaway from this book is that the most successful reforestation happens if planning begins as soon as the flames die down,” said Dr. Bill Stewart, Co-Director, Berkeley Forests. “The manual presents a planning process, with a detailed explanation of the options at each step. These basic steps are the same for a small landowner, large landowner, or an agency.”
The recommended practices are the result of 50 years of concentrated effort to improve reforestation success and reduce costs under the difficult conditions present in most of California. Significant lessons have been learned since the last reforestation manual for California was published in 1971. The 16 co-authors of the new book present the best practices gleaned from their combined experience of planting over 100 million conifer seedlings on hundreds of thousands of acres of public and private land in the state. Funding for the preparation of this book was provided by the California Department of Forestry and Fire Protection (CAL FIRE), the U.S. Forest Service, and private donors.
Successful reforestation is nothing like landscaping a yard and going down to the nursery to buy a few fruit trees to plant and water in your backyard. Because reforesting burned forestland depends on natural precipitation and not costly irrigation systems, reforestation requires careful evaluation of the site and the availability of locally adapted native seeds. If seeds are available, then foresters prescribe treatments for the site and the quantity of seedlings of each species needed. Over the next two years, the forester will plan and implement site preparation, plant nursery grown seedlings, and arrange follow-up treatments as needed.
Bob Rynearson of W. M. Beaty & Associates, Inc, a forestland consulting firm in Redding, California and one of the book's authors explains, “Experience has shown controlling competing vegetation results in the retention of sufficient soil moisture for excellent seedling survival rates, even on very dry sites during prolonged droughts, when high quality, locally adapted native seedlings are planted properly. If you don't properly plan and implement the sequence of each time-critical reforestation step, then you're probably wasting your money, time, and valuable conifer seed.”
“To maintain the carbon capturing potential of our forests, significant investments in effective reforestation on private and public forest lands will be necessary,” said Dr. Stewart. “The bottom line is that achieving success is critical if the growing backlog of California's fire damaged forests are to once again be filled with healthy trees.”
The president of the non-profit organization Forest Landowners of California, Claire McAdams, is enthusiastic in support of the book: “The loss of family forests due to wildfires, often after one or more decades of ownership and careful husbandry, is emotionally gut wrenching. The new Reforestation Practices for Conifers in California publication by UCANR is an excellent guide to both the process and issues facing non-industrial forestland owners seeking to reforest their land. This publication belongs on everyone's reference shelf.”
Bill Stewart of the University of California' Berkeley Forests and Agricultural and Natural Resources is the technical editor for the project. “The final book includes more than 500 pages, 200 figures, and 800 scientific references. It will be a valuable resource for landowners, practitioners, and policy makers” he said. The process involved 16 co-authors and more than 25 peer reviewers. Given the time sensitive need to get this information out in the public arena while UCANR is completing the copy editing, final high quality illustrations, and hard copy publication, we agreed to post all of the peer reviewed chapters for easy download on the Forest Vegetation Management Conference website, noted Stewart. The Forest Vegetation Management Conference made major contributions to both the accumulation of the new knowledge that led to this book's creation and to the process that led to this book becoming a reality rather than just an idea.