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  1. Seedling regeneration in the alpine treeline ecotone: Comparison of wood microsites and adjacent soil substrates

    Although climate warming is generally expected to facilitate upward advance of forests, conifer seedling regeneration and survival may be hindered by low substrate moisture, high radiation, and both low and high snow accumulation. To better understand substrate-related factors promoting regeneration in the alpine treeline ecotone, this study compared 2 substrates...

    Author(s):
    Adelaide Chapman Johnson; J. Alan Yeakley
    Year:
    2016
    Keywords:
    Forest line, alpine treeline ecotone, plant water potential, moisture, temperature, conifer seedling regeneration, Pacific Northwest.
    Source:
    Mountain Research and Development. 36(4): 443-451.

  2. A severity rating system for evaluating stand-level balsam woolly adelgid (Hemiptera: Adelgidae) damage in two Abies species in western North America

    Severity rating systems are fundamental to understanding the impacts of disturbance agents in forest stands. The balsam woolly adelgid (BWA), Adelges piceae (Ratzeburg) (Hemiptera: Adelgidae), is an invasive forest pest in North America that infests and causes mortality in true fir, Abies spp. There is currently no single...

    Author(s):
    Kathryn H. Hrinkevich; Robert A. Progar; David C. Shaw
    Year:
    2016
    Keywords:
    Balsam woolly adelgid, invasive insect, nonnative, forest impact, high elevation.
    Source:
    Forest Science. 62(2): 181-189.
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