Landscape Ecology

, Volume 20, Issue 6, pp 719–731 | Cite as

Assessing Spatial Uncertainty Associated with Forest Fire Boundary Delineation

  • Geraldine J. Jordan
  • Marie-Josée Fortin
  • Kenneth P. Lertzman
Research Article
Received:
Accepted:

Abstract

Uncertainty in managing forested landscapes arises from many sources, including complexities inherent in forest ecosystems and their disturbance processes. However, gaining knowledge about forested ecosystems at the landscape level is often impeded by limitations in collecting comprehensive, representative, as well as accurate data sets. Historical reference data sets about past disturbances are also mostly lacking. In the case of ground fires, however, records of past fires can be obtained by analyzing fire scars using dendrochronology. While the temporal series of disturbance can be determined, there is still uncertainty about the spatial limits of individual forest surface fires. Here, we investigate how a patch-based method (fuzzy set membership) and a boundary-based uncertainty method (boundary membership) can help determine the spatial uncertainty related to forest fire events and their boundary locations. We compare these methods using fire scar data from ponderosa pine (Pinus ponderosa) and Douglas-fir (Pseudotsuga menziesii) sampled at 33 1-ha plots in a 1500-ha study area within the Stein River watershed (British Columbia). Patch-based fire maps, using multiple constraints, were derived for years 1785–1937. We compared the resulting total fire event maps with the boundary-based method, finding that depending on values chosen for the patch-based method, negative correlation was present (though very modest: r = − 0.1, p ≤ 0.05) between some maps. However, significant positive correlation between maps (though again modest: r = 0.22, p ≤ 0.05) was found under the least constrained patch-based methods, suggesting that fire patches are counted more than once in riparian zones. Our results suggest that these two methods provide complementary information about historical fire size and spatial limits. Quantifying spatial uncertainty about fire size and fire boundary location using a boundary membership method can contribute to not only understanding past fire regimes but also to providing better estimates of area burned.

Keywords

Boundary Fire scar Natural disturbance Location uncertainty Fuzzy sets Dendrochronology Forest management Surface fire Spatial methods 
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Copyright information

© Springer 2005

Authors and Affiliations

  • Geraldine J. Jordan
    • 1
    • 2
  • Marie-Josée Fortin
    • 1
    • 3
  • Kenneth P. Lertzman
    • 1
  1. 1.School of Resource and Environmental ManagementSimon Fraser UniversityBurnabyCanada
  2. 2.Geography ProgramTrinity Western UniversityLangleyCanada
  3. 3.Department of ZoologyUniversity of TorontoTorontoCanada

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