International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Relationships among indices of fire severity in riparian zones

Jessica E. Halofsky A B and David E. Hibbs A
+ Author Affiliations
- Author Affiliations

A Department of Forest Science, Oregon State University, Corvallis, OR 97331, USA.

B Corresponding author. Email: jhalo@u.washington.edu

International Journal of Wildland Fire 18(5) 584-593 https://doi.org/10.1071/WF07050
Submitted: 21 March 2007  Accepted: 18 August 2008   Published: 10 August 2009

Abstract

There is no standard quantitative measure of fire severity. Although different measures of fire severity are often assumed to be closely related, information on the relationships between these measures of fire severity is limited. Information on the relationship between various fire severity indices is particularly lacking for riparian zones, critical areas of the landscape for both habitat and water quality. The present study explores relationships among several ground-based and remotely sensed indices of fire severity in riparian areas of recent fires in Oregon, including ground-based indices of overstorey fire severity (crown scorch and basal area mortality) and understorey fire severity (height of bole char and exposed mineral soil). There were relatively strong associations between the two overstorey indices of fire severity and also between the two understorey indices of fire severity. However, there were weaker associations between understorey and overstorey fire severity indices, suggesting they are at least partially independent. Results also suggested weak associations between ground-based fire severity indices and remotely sensed fire severity assessments in riparian areas. Overall, we show there are limitations to the interpretation and use of these commonly used fire severity assessments in riparian areas.

Additional keywords: basal area mortality, crown scorch, exposed mineral soil, height of bole char.


Acknowledgements

The authors thank Michael Ahr and Olivia Duren for assistance with data collection. Jonathan Thompson and Tom Spies generously provided results of their dNBR analysis for our use. Travis Woolley helped with figures. The manuscript was improved with helpful reviews by Dan Donato, Joe Fontaine, Tom Spies, Jonathan Thompson and anonymous reviewers. The present study was carried out with funding from the Cooperative Forest Ecosystem Research Program, a cooperative among the US Geological Survey Forest and Rangeland Ecosystem Science Center, Oregon State University, the Bureau of Land Management, and the Oregon Department of Forestry.


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