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    Impacts of western juniper on plant community composition and structure

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    Author
    Miller, R. F.
    Svejcar, T. J.
    Rose, J. A.
    Issue Date
    2000-11-01
    Keywords
    artemisia arbuscula
    fir interval
    Festuca idahoensis
    Poa secunda
    Achnatherum thurberianum
    understory
    steppes
    species diversity
    ecological succession
    Populus tremuloides
    Juniperus occidentalis
    fires
    fire effects
    Oregon
    Artemisia tridentata
    plant communities
    California
    plant density
    plant competition
    canopy
    Juniperus occidentalis
    species composition
    plant cover
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    Citation
    Miller, R. F., Svejcar, T. J., & Rose, J. A. (2000). Impacts of western juniper on plant community composition and structure. Journal of Range Management, 53(6), 574-585.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643810
    DOI
    10.2307/4003150
    10.2458/azu_jrm_v53i6_miller
    Additional Links
    https://rangelands.org/
    Abstract
    Western juniper (Juniperus occidentalis Hook.) has been actively invading shrub steppe communities during the past 120 years. The majority of these stands are still in transition, from early open juniper shrub steppe communities to closed juniper woodlands. In addition, juniper expansion has been occurring across a broad array of soils and topographic positions. Despite the high degree of spatial and developmental heterogeneity, juniper woodlands are frequently treated generically in resource inventories, management, and wildlife habitat assessments. Our goal was to evaluate the impact of western juniper encroachment and dominance on plant community composition and structure across several plant associations. This study was conducted in southeastern Oregon and northeastern California on low sage-brush (Artemisia arbuscula Nutt.), mountain big sagebrush (A . tridentata spp. vaseyana (RYBD. )Beetle), and aspen (Populus tremuloides Michx.) alliances. Stages of woodland development across plant associations were categorized into 1 of 4 successional phases (early, mid, late, and closed) based on tree growth and stand structural characteristics. Plant cover by species group, species diversity and richness, bareground cover, soil characteristics, elevation, aspect, and slope were measured in 108, 60 x 46m macroplots. Twinspan was used to sort plant communities. Regression analysis was used to evaluate the relationship of tree canopy cover to shrub and herbaceous cover. Herbaceous and bareground cover were compared between early and closed stands within plant communities. Woodland structure at stand closure was different among associations varying from 19% cover and 64 trees ha-1 in a low sagebrush community to 90% cover and 1,731 trees ha-1 in an aspen community. Increase in juniper dominance had little impact on low sagebrush and an inconsistent effect on bitterbrush (Purshia tridentata Pursh.). In the mountain big sagebrush alliance, sagebrush cover declined to approximately 80% of maximum potential as juniper increased to about 50% of maximum canopy cover. Aspen (Populus tremuloides Michx.) also declined as juniper dominance increased. Herbaceous cover and species diversity declined and bare ground increased with increasing juniper dominance in the mountain big sagebrush/Thurber needlegrass association. However, herbaceous cover on the deeper soils characterized by Idaho fescue did not decrease with increasing juniper dominance. To determine the effect of juniper dominance or woodland management on community composition and structure, plant community and stage of stand development should be identified.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003150
    Scopus Count
    Collections
    Journal of Range Management, Volume 53, Number 6 (November 2000)

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