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    Effect of Pinyon-Juniper Tree Cover on the Soil Seed Bank

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    Author
    Allen, Elizabeth A.
    Nowak, Robert S.
    Issue Date
    2008-01-01
    Keywords
    Artemisia tridentata
    Bromus tectorum
    Collinsia parviflora
    Poa secunda
    seed density
    seed-bank diversity
    
    Metadata
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    Citation
    Allen, E. A., & Nowak, R. S. (2008). Effect of pinyon–juniper tree cover on the soil seed bank. Rangeland Ecology & Management, 61(1), 63-73.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642926
    DOI
    10.2111/07-007R2.1
    Additional Links
    https://rangelands.org/
    Abstract
    As pinyon-juniper (specifically, Pinus monophylla and Juniperus osteosperma) woodlands in the western United States increase in distribution and density, understory growth declines and the occurrence of crown fires increases, leaving mountainsides open to both soil erosion and invasion by exotic species. We examined if the loss in understory cover that occurred with increasing tree cover was reflected in the density and diversity of the seed bank. Seed banks in stands with low, medium, and high tree cover were measured in late October for 2 yr. Multivariate analyses indicated that cover and diversity of standing vegetation changed as tree cover increased. However, the seed bank did not differ in overall seed density or species diversity because seeds of the 13 species that comprised 86% of the seed bank occurred in similar density across the tree-cover groups. Sixty-three percent of the species that were in the seed bank were absent from the vegetation (mostly annual forbs). In addition, 49% of the species that occurred in the standing vegetation were not in the seed bank (mostly perennial forbs and shrubs). Only Artemisia tridentata, Bromus tectorum, and Collinsia parviflora displayed positive Spearman rank correlations between percent cover in the vegetation and density in the seed bank. Thus, much of the standing vegetation was not represented in the seed bank, and the few species that dominated the seed bank occurred across varying covers of pinyon-juniper. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/07-007R2.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 61, Number 1 (January 2008)

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