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    Author(s): W.D. Devine; C.A. Harrington
    Date: 2007
    Source: Northwest Science. 81(2): 112-124
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (1.82 MB)


    Many former Oregon white oak woodland and savanna stands in the coastal Pacific Northwest have been invaded and subsequently overtopped by Douglas-fir during the past century. We examined soil water and microclimate conditions near overtopped oak trees and near oak trees that had been released from Douglas-fir. In each of the three study years, volumetric soil water content declined from ~25 percent to ~10 percent during the early-to-mid growing season near all trees, but this decline was delayed approximately 1 month in the released condition. Throughfall from May through July was increased by release, particularly during light rain events when Douglas-fir crowns intercepted a substantial fraction of total precipitation. Release from Douglas-fir also increased soil temperature, maximum air temperature, and maximum vapor pressure deficit.

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    Devine, W.D.; Harrington, C.A. 2007. Release of Oregon white oak from overtopping Douglas-fir: effects on soil water and microclimate. Northwest Science. 81(2): 112-124


    Quercus garryana, Oregon white oak, release, soil water, throughfall, microclimate

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