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    Author(s): V. Wallace McCarlie; Lee D. Hansen; Bruce N. Smith
    Date: 2001
    Source: In: McArthur, E. Durant; Fairbanks, Daniel J., comps. Shrubland ecosystem genetics and biodiversity: proceedings; 2000 June 13-15; Provo, UT. Proc. RMRS-P-21. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 271-275.
    Publication Series: Proceedings (P)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (109.34 KB)

    Description

    Cheatgrass (Bromus tectorum L.) is a dominant weed that has increased the frequency of wildfire in the Great Basin since its introduction approximately 106 years ago. Characteristics of respiratory metabolism were examined in eleven subpopulations from different habitats. Seeds from each subpopulation were germinated (4mm radicle) and metabolic heat rates (q) and respiration rates (RCO2) determined calorimetrically at 5 °C intervals from 5 to 30 °C or from 5 to 45 °C. From the experimental data, growth rates and ratios of q/RCO2 (a measure of efficiency) were calculated. In general, growth rate increases from a low temperature limit of 3 to 7 °C to an upper temperature limit between 27 to 31 °C. Beyond these limits growth ceases. These limits differ among subpopulations, and are related to the native microclimate.

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    Citation

    McCarlie, V. Wallace; Hansen, Lee D.; Smith, Bruce N. 2001. Respiratory and physiological characteristics in subpopulations of Great Basin cheatgrass. In: McArthur, E. Durant; Fairbanks, Daniel J., comps. Shrubland ecosystem genetics and biodiversity: proceedings; 2000 June 13-15; Provo, UT. Proc. RMRS-P-21. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 271-275.

    Keywords

    wildland shrubs, genetics, biodiversity, disturbance, ecophysiology, community ecology

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