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    • Journal of Range Management, Volume 53 (2000)
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    Early establishment of Douglas-fir and ponderosa pine in grassland seedbeds

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    Author
    Bai, Y.
    Thompson, D.
    Broersma, K.
    Issue Date
    2000-09-01
    Keywords
    longevity
    seedbeds
    conifer needles
    British Columbia
    seedling emergence
    Pinus ponderosa
    allelopathy
    ecological succession
    mortality
    Pseudotsuga menziesii
    seedlings
    seed germination
    establishment
    plant litter
    allelopathy
    litter structure
    seedbed ecology
    Pinus ponderosa Dougl.
    Pseudotsuga menziesii var. glauca (Beissn.)
    Franco
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    Citation
    Bai, Y., Thompson, D., & Broersma, K. (2000). Early establishment of Douglas-fir and ponderosa pine in grassland seedbeds. Journal of Range Management, 53(5), 511-517.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643802
    DOI
    10.2307/4003652
    10.2458/azu_jrm_v53i5_bai
    Additional Links
    https://rangelands.org/
    Abstract
    Grassland of interior British Columbia are being encroached upon by Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) and ponderosa pine (Pinus ponderosa Dougl.). A pot experiment placed in the field was conducted to determine the effect of forest and grassland seedbeds on seedling emergence and early establishment of the 2 species with 2 seed collections each. For these seedbeds, structural characteristics were evaluated and the effect of seedbeds water extracts on seed germination was determined. Seedling emergence of both species was significantly reduced by Douglas-fir needles and enhanced by fescue litter and cattle manure compared to mineral soil. The rate of emergence was reduced by Douglas-fir needles and sagebrush litter, and for some collections, by ponderosa pine needles, but was always enhanced by manure compared to mineral soil. Seedling survival was generally not affected by seedbeds. Douglas-fir seedlings emerging earlier in the season survived better, and both Douglas-fir and ponderosa pine seedlings emerging earlier lived longer than these emerging later. Seed germination of ponderosa pine was not affected by the water extract while that of Douglas-fir was reduced by the water extract from sagebrush litter. Therefore, differences in seedling emergence of the 2 species among seedbeds were related more to structural than to chemical characteristics of seedbeds. Successful establishment of the 2 species in grasslands within this region likely relies on the ability of seeds to germinate early in the growing season on seedbeds in which soil moisture is conserved, as summer droughts are severe.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003652
    Scopus Count
    Collections
    Journal of Range Management, Volume 53, Number 5 (September 2000)

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