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The Ecological Role of Fire in Sierran Conifer Forests: Its Application to National Park Management

Published online by Cambridge University Press:  20 January 2017

Bruce M. Kilgore*
Affiliation:
Professional Support, Western Regional Office, National Park Service, 450 Golden Gate Avenue, Box 36063, San Francisco, California 94102 USA

Abstract

The impact of fire on the environment of the various Sierran conifer forests varies with intensity and frequency. Generally, however, fire (1) prepares a seedbed; (2) cycles nutrients within the system; (3) adjusts the successional pattern; (4) modifies conditions affecting wildlife; (5) influences the mosaic of age classes and vegetation types; (6) alters the numbers of trees susceptible to disease and insects; and (7) both reduces and creates fire hazards. Natural fire frequency apparently coincides with levels of fuel accumulation that result in burns of relatively low intensity at frequent intervals. This may average 8 yr in mixed conifer forests, although frequencies from 4 to 20 yr or more are found in particular sites.

In all probability, giant sequoia and various pines of the Sierra survive today because of the role fire plays in the various forest types. National Park Service management policies are aimed at restoring fire, as nearly as possible, to its natural role in Sierran conifer forests. This is being accomplished by prescribed burning at lower and middle elevation types and by allowing lightning fires to burn in higher elevation forests.

Information

Type
Original Articles
Copyright
University of Washington

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