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    Surficial geology and fire in southeastern Arizona grasslands- effects on soil geochemistry in semiarid ecosystems, Fort Huachuca Military Reservation, Arizona

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    Author
    Biggs, T.H.
    Pearthree, P.A.
    Florkowski, L.N.
    Shaner, P.L.
    Issue Date
    2006-06-01
    Keywords
    Arizona Geological Survey Open File Reports
    Cochise County
    Fort Huachuca Military Reservation
    Arizona
    semiarid ecosystems
    fire
    soil
    geochemisty
    grassland
    Geology
    soil chemistry
    surficial geology
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    Citation
    Biggs, T.H., Pearthree, P.A., Florkowski, L.N., and Shaner, P.L., 2006, Surficial geology and fire in southeastern Arizona grasslands- effects on soil geochemistry in semiarid ecosystems, Fort Huachuca Military Reservation, Arizona. Arizona Geological Survey Open File Report, OFR-06-02, 50 p.
    Description
    Throughout the southwestern United States, vegetation in what historically was grassland has changed to a mixture of trees and shrubs; exotic grass species and undesirable shrubs have also invaded the grasslands at the expense of native grasses. The availability and amount of soil nutrients influence the relative success of plants, but few studies have examined fire effects on soil characteristics in a temporal, spatial, and species group specific fashion. Likewise, few studies have tied fire effects and ecological aspects to the underlying geology. Our research investigates the effects of fire events on selected soil characteristics pH, nitrate (NO3-), plant-available phosphorus (PO4 -3), and total organic carbon (TOC) on native grass-, exotic grass-, and mixed grass-dominated plots distributed on four different geological surfaces. Treated and control plots were sampled prior to burn treatment and at intervals after the burns. In addition to new geologic mapping of the study areas, results indicate the geologic substrate is the most important variable for explaining pH, NO3- and PO4-3 values in the soils. Dominant grass type –native, non-native, or mixed – had little effect on the response of soil geochemistry to fire events: post-burn results indicate vegetation was a significant factor only for TOC. Recovery to pre-burn levels varies with characteristic: there were no significant initial differences between vegetation types, but significant differences in NO3-, PO4-3, and TOC amounts occur as a result of fire events, geological characteristics, and time. The research helps identify the soil response to fire and the recovery times of soil characteristics, further defines which fire frequency is optimal as a management strategy to maximize soil macronutrient contents, and illustrates the important role geology plays in grassland ecosystems.
    URI
    http://hdl.handle.net/10150/630004
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    OFR-06-02
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    31.6534
    South Bounding Coordinate
    31.4662
    West Bounding Coordinate
    -110.544
    East Bounding Coordinate
    -110.099
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