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    Relationships between Overstory Structure and Understory Production in the Grand Fir/Myrtle Boxwood Habitat Type of Northcentral Idaho

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    Author
    Pyke, D. A.
    Zamora, B. A.
    Issue Date
    1982-11-01
    Keywords
    Stem
    Overstory Structure
    understory production
    Grand Fir
    Myrtle Boxwood Habitat
    Northcentral Idaho
    Stem Diameters
    Canopy Coverage
    graminoids
    Clearwater Ranger District
    Nezperce National Forest
    density
    shrubs
    height
    basal area
    relationships
    forbs
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    Citation
    Pyke, D. A., & Zamora, B. A. (1982). Relationships between overstory structure and understory production in the grand fir/myrtle boxwood habitat type of northcentral Idaho. Journal of Range Management, 35(6), 769-773.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/646077
    DOI
    10.2307/3898261
    Additional Links
    https://rangelands.org/
    Abstract
    Relationships between overstory structure and understory current year production on 20 undisturbed sites of the grand fir/myrtle boxwood habitat type were studied in the Clearwater Mountains of northcentral Idaho. Overstory characteristics measured were tree canopy coverage, sum of the tree diameters, basal area, stand height, and stem density. Understory production was divided into four vegetation classes: (1) shrubs, (2) forbs, (3) graminoid and (4) total production. Regression models predicting current year production of each understory vegetation class were developed using all possible combinations of overstory parameters as independent variables. Canopy coverage and sum of the tree diameters were found to be the best indices of understory production. Canopy coverage was most significantly correlated with total understory production and shrub production. Canopy coverage and sum of the tree diameters were the most significantly correlated overstory parameters with forb production. Graminoid production was not significantly correlated to any of the measured overstory parameters. Basal area, tree density, and stand height were not statistically related to the understory production. Further examination of the models is needed to validate these relationships over the range of the grand fir/myrtle boxwood habitat type. The models are not applicable to areas where recent disturbance such as logging, fire, or disease has affected overstory structure.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898261
    Scopus Count
    Collections
    Journal of Range Management, Volume 35, Number 6 (November 1982)

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