Landscape Ecology

, Volume 22, Issue 4, pp 507–516

Landscape heterogeneity and fire behavior: scale-dependent feedback between fire and grazing processes

  • Jay D. Kerby
  • Samuel D. Fuhlendorf
  • David M. Engle
Research Article
  • 403 Downloads

Abstract

Fire and grazing are ecological processes that frequently interact to modify landscape patterns of vegetation. There is empirical and theoretical evidence that response of herbivores to heterogeneity is scale-dependent however the relationship between fire and scale of heterogeneity is not well defined. We examined the relationship between fire behavior and spatial scale (i.e., patch grain) of fuel heterogeneity. We created four heterogeneous landscapes modeled after those created by a fire–grazing interaction that differed in grain size of fuel patches. Fire spread was simulated through each model landscape from 80 independent, randomly located ignition points. Burn area, burn shape complexity and the proportion of area burnt by different fire types (headfire, backfire and flankfire) were all affected by the grain of fuel patch. The area fires burned in heterogeneous landscapes interacted with the fuel load present in the patch where ignition occurred. Burn complexity was greater in landscapes with small patch grain than in landscapes with large patch grain. The proportion of each fire type (backfire, flankfire and headfire) was similar among all landscapes regardless of patch grain but the variance of burned area within each of the three fire types differed among treatments of patch grain. Our landscape fire simulation supports the supposition that feedbacks between landscape patterns and ecological processes are scale-dependent, in this case spatial scale of fuel loading altering fire spread through the landscape.

Keywords

Burning Herbivory Landscape pattern Modeling Shifting mosaics Simulation Vegetation biomass 

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Jay D. Kerby
    • 1
  • Samuel D. Fuhlendorf
    • 1
  • David M. Engle
    • 2
  1. 1.Department of Plant and Soil SciencesOklahoma State UniversityStillwaterUSA
  2. 2.Department of Natural Resource Ecology and ManagementIowa State UniversityAmesUSA

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