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Modeling impacts of fire severity on successional trajectories and future fire behavior in Alaskan boreal forestsAuthor(s): Jill F. Johnstone; T. Scott Rupp; Mark Olson; David Verbyla
Source: Landscape Ecology. 26: 487-500. doi:10.1007/s10980-011-9574-6
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
PDF: Download Publication (1010.97 KB)
DescriptionMuch of the boreal forest in western North America and Alaska experiences frequent, stand-replacing wildfires. Secondary succession after fire initiates most forest stands and variations in fire characteristics can have strong effects on pathways of succession. Variations in surface fire severity that influence whether regenerating forests are dominated by coniferous or deciduous species can feedback to influence future fire behaviour because of differences in forest flammability. We used a landscape model of fire and forest dynamics to explore the effects of different scenarios of surface fire severity on subsequent forest succession and potential fire activity in interior Alaska. Model simulations indicated that high levels of surface fire severity leading to a prolonged phase of deciduous forest dominance caused a reduction in landscape flammability and fewer large fire events. Under low surface fire severity, larger patches of contiguous conifer forest promoted fire spread and resulted in landscapes with shorter fire return intervals compared to scenarios of high surface severity. Nevertheless, these negative feedbacks between fire severity, deciduous forest cover, and landscape flammability were unable to fully compensate for greater fire activity under scenarios of severe climate warming. Model simulations suggest that the effects of climate warming on fire activity in Alaska's boreal forests may be partially but not completely mitigated by changes in fire severity that alter landscape patterns of forest composition and subsequent fire behaviour.
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CitationJohnstone, Jill F.; Rupp, T. Scott; Olson, Mark; Verbyla, David. 2011. Modeling impacts of fire severity on successional trajectories and future fire behavior in Alaskan boreal forests. Landscape Ecology. 26: 487-500. doi:10.1007/s10980-011-9574-6.
KeywordsALFRESCO, black spruce, boreal forest, climate change, disturbance, fire regime, forest regeneration, simulation model, Picea mariana
- Persistent effects of fire severity on early successional forests in interior Alaska
- Changes in fire regime break the legacy lock on successional trajectories in Alaskan boreal forest
- Variation in plant community composition and vegetation carbon pools a decade following a severe fire season in interior Alaska
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