- Tree death rates have more than doubled over the last few decades in old-growth forests of our western states, possibly reflecting increasing temperatures, with potentially serious consequences for wildlife, fire risks, and the global carbon cycle
Phillip van Mantgem
Phil van Mantgem is a research ecologist at the Western Ecological Research Center.
RESEARCH INTERESTS
- Conservation biology
- Fire ecology
- Forest ecology
Science and Products
Characterizing Post-Fire Burn Severity And Vegetation Recovery At High Spatial And Temporal Resolutions Using Basal Area Measurements
USGS scientists are studying the effects of wildfires on forests and developing models to predict forest recovery potential after fires. They have collected and analyzed data from several recent California wildfires, including the Dixie, Caldor, KNP Complex, Carr, and Mosquito fires. Researchers are using the data to analyze changes in basal area (the cross-sectional area of tree trunks) to...
WERC Fire Science
WERC scientists are defining the past, present, and future of wildfires for wildlife and human communities. Explore this webpage to learn about specific, ongoing projects across California and parts of Nevada.
Understanding Fire-caused Vegetation Type Conversion in Southwestern Conifer Forests under Current and Future Climate Conditions
Fire size, frequency, overall area burned, and severity are increasing across many vegetation types in the southwestern U.S. In many cases, large contiguous areas are burning repeatedly at high severity, triggering vegetation type conversions (VTC), where once-dominant coniferous forests fail to return to their pre-fire state, often transitioning to shrub- or grass-dominated systems. Loss of these
Post-Fire Conifer Regeneration Under a Warming Climate: Will Severe Fire Be a Catalyst for Forest Loss?
The Southwest U.S. is experiencing hotter droughts, which are contributing to more frequent, severe wildfires. These droughts also stress vegetation, which can make it more difficult for forests to recover after fire. Forest regeneration in burned areas may be limited because seeds have to travel long distances to recolonize, and when they do arrive, conditions are often unfavorably hot and dry. C
Drought and Western Forests
USGS WERC's Dr. Phil van Mantgem and his collaborators are using plot-based methods to describe change and vulnerability to drought in the forests of the western United States. A focus of this work is the installation and maintenance of large (1 ha) monitoring plots. Many other vegetation monitoring strategies are based on small (0.1 ha) plots, which may not be sufficient to detect changes in...
Forest Restoration in the Western U.S.
This project uses new and existing field data to assess forest restoration treatment effects across broad spatial and temporal scales. WERC's Dr. Phil van Mantgem and project partners are considering the effects of restoration treatments in terms of forest structure, forest stand development, subsequent tree mortality patterns mortality, and how climate influences the success or failure of...
Fire Severity Trends in the Western U.S.
How will increased drought affect forest fire severity? WERC’s Dr. Phil van Mantgem is testing the idea increased drought stress may affect forest fire severity independent of fire intensity. Drought stress prior to fire can affect tree health, potentially resulting in a higher sensitivity to fire-induced damage. Thus, with drought there may be ongoing increases in fire severity (the number of...
Redwood Field Station
The Redwood Field Station is located in Arcata, CA. Click on the following tab to learn more.
Can Prescribed Fire Help Forests Survive Drought in the Sierra Nevada Mountains?
In 2017, California was experiencing its most severe drought in over a millennia. Low rainfall and record high temperatures resulted in increased tree mortality and complete forest diebacks across the West. Though land managers scrambled to respond, they lacked information needed to make informed decisions. Focusing on California’s central and southern Sierra Nevada Mountains, this project seeks t
Fighting Drought with Fire: A Comparison of Burned and Unburned Forests in Drought-Impacted Areas of the Southwest
Drought is one of the biggest threats facing our forests today. In the western U.S., severe drought and rising temperatures have caused increased tree mortality and complete forest diebacks. Forests are changing rapidly, and while land managers are working to develop long-term climate change adaptation plans, they require tools that can enhance forest resistance to drought now. To address this imm
How Does Drought Influence Fire Severity in the Southwestern U.S.?
There is a growing realization that current warming trends may be associated with increases in the size, frequency, and severity of forest fires in the West. While rising temperatures can create drought conditions that favor severe fires, it is also possible that drought limits the ability of trees to survive a fire. During a drought, there is less water available for trees and more outbreaks of h
Characterizing a link in the terrestrial carbon cycle: a global overview of individual tree mass growth
Forests sequester the majority of the terrestrial biosphere’s carbon and are key components of the global carbon cycle, potentially contributing substantial feedbacks to ongoing climatic changes. It is therefore remarkable that no consensus yet exists about the fundamental nature of tree mass growth (and thus carbon sequestration rate). Specifically, does tree mass growth rate increase, decrease,
SneakPeek: USGS Public Lecture, Can Our Western Forests Take the Heat?
- Tree death rates have more than doubled over the last few decades in old-growth forests of our western states, possibly reflecting increasing temperatures, with potentially serious consequences for wildlife, fire risks, and the global carbon cycle
Science and Products
Characterizing Post-Fire Burn Severity And Vegetation Recovery At High Spatial And Temporal Resolutions Using Basal Area Measurements
USGS scientists are studying the effects of wildfires on forests and developing models to predict forest recovery potential after fires. They have collected and analyzed data from several recent California wildfires, including the Dixie, Caldor, KNP Complex, Carr, and Mosquito fires. Researchers are using the data to analyze changes in basal area (the cross-sectional area of tree trunks) to...
WERC Fire Science
WERC scientists are defining the past, present, and future of wildfires for wildlife and human communities. Explore this webpage to learn about specific, ongoing projects across California and parts of Nevada.
Understanding Fire-caused Vegetation Type Conversion in Southwestern Conifer Forests under Current and Future Climate Conditions
Fire size, frequency, overall area burned, and severity are increasing across many vegetation types in the southwestern U.S. In many cases, large contiguous areas are burning repeatedly at high severity, triggering vegetation type conversions (VTC), where once-dominant coniferous forests fail to return to their pre-fire state, often transitioning to shrub- or grass-dominated systems. Loss of these
Post-Fire Conifer Regeneration Under a Warming Climate: Will Severe Fire Be a Catalyst for Forest Loss?
The Southwest U.S. is experiencing hotter droughts, which are contributing to more frequent, severe wildfires. These droughts also stress vegetation, which can make it more difficult for forests to recover after fire. Forest regeneration in burned areas may be limited because seeds have to travel long distances to recolonize, and when they do arrive, conditions are often unfavorably hot and dry. C
Drought and Western Forests
USGS WERC's Dr. Phil van Mantgem and his collaborators are using plot-based methods to describe change and vulnerability to drought in the forests of the western United States. A focus of this work is the installation and maintenance of large (1 ha) monitoring plots. Many other vegetation monitoring strategies are based on small (0.1 ha) plots, which may not be sufficient to detect changes in...
Forest Restoration in the Western U.S.
This project uses new and existing field data to assess forest restoration treatment effects across broad spatial and temporal scales. WERC's Dr. Phil van Mantgem and project partners are considering the effects of restoration treatments in terms of forest structure, forest stand development, subsequent tree mortality patterns mortality, and how climate influences the success or failure of...
Fire Severity Trends in the Western U.S.
How will increased drought affect forest fire severity? WERC’s Dr. Phil van Mantgem is testing the idea increased drought stress may affect forest fire severity independent of fire intensity. Drought stress prior to fire can affect tree health, potentially resulting in a higher sensitivity to fire-induced damage. Thus, with drought there may be ongoing increases in fire severity (the number of...
Redwood Field Station
The Redwood Field Station is located in Arcata, CA. Click on the following tab to learn more.
Can Prescribed Fire Help Forests Survive Drought in the Sierra Nevada Mountains?
In 2017, California was experiencing its most severe drought in over a millennia. Low rainfall and record high temperatures resulted in increased tree mortality and complete forest diebacks across the West. Though land managers scrambled to respond, they lacked information needed to make informed decisions. Focusing on California’s central and southern Sierra Nevada Mountains, this project seeks t
Fighting Drought with Fire: A Comparison of Burned and Unburned Forests in Drought-Impacted Areas of the Southwest
Drought is one of the biggest threats facing our forests today. In the western U.S., severe drought and rising temperatures have caused increased tree mortality and complete forest diebacks. Forests are changing rapidly, and while land managers are working to develop long-term climate change adaptation plans, they require tools that can enhance forest resistance to drought now. To address this imm
How Does Drought Influence Fire Severity in the Southwestern U.S.?
There is a growing realization that current warming trends may be associated with increases in the size, frequency, and severity of forest fires in the West. While rising temperatures can create drought conditions that favor severe fires, it is also possible that drought limits the ability of trees to survive a fire. During a drought, there is less water available for trees and more outbreaks of h
Characterizing a link in the terrestrial carbon cycle: a global overview of individual tree mass growth
Forests sequester the majority of the terrestrial biosphere’s carbon and are key components of the global carbon cycle, potentially contributing substantial feedbacks to ongoing climatic changes. It is therefore remarkable that no consensus yet exists about the fundamental nature of tree mass growth (and thus carbon sequestration rate). Specifically, does tree mass growth rate increase, decrease,
SneakPeek: USGS Public Lecture, Can Our Western Forests Take the Heat?
- Tree death rates have more than doubled over the last few decades in old-growth forests of our western states, possibly reflecting increasing temperatures, with potentially serious consequences for wildlife, fire risks, and the global carbon cycle
- Tree death rates have more than doubled over the last few decades in old-growth forests of our western states, possibly reflecting increasing temperatures, with potentially serious consequences for wildlife, fire risks, and the global carbon cycle