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    Author(s): Jacqueline Rose; Richard Cobb
    Date: 2020
    Source: Proceedings of the seventh sudden oak death science and management symposium: healthy plants in a world with <em>Phytophthora</em>. Gen. Tech. Rep. PSW-GTR-268
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (316.0 KB)


    Sudden Oak Death (caused by Phytophthora ramorum) has been present in the Big Sur region since the mid-1990s (or earlier) and is the primary agent of mortality in tanoaks (Notholithocarpus densiflorus) there. Phytophthora ramorum also causes significant mortality in coast live oak (Quercus agrifolia) and Shreve oak (Quercus parvula var. shrevei) as well as ramorum blight in other species including California bay laurel (Umbellularia californica). A body of work has shown this changes forest composition and species abundance in Big Sur (Metz and others 2011).

    A plot network consisting of 280 plots was established in 2006 and 2007 to study the epidemiology and impacts of P. ramorum in Big Sur. The plots were established in forests dominated either by coast redwood (Sequoia sempervirens) or by mixed-evergreen species (Metz and others 2011). The purpose of the plot network has shifted focus to include the interaction of P. ramorum and fire following the 2008 Basin Complex Fires, in which 97 plots burned; and the 2016 Soberanes Fire, in which 113 plots burned. Previous work has shown that there is increased coast redwood mortality under certain conditions of disease and fire (Metz and others 2013) and that the resprouting patterns of tanoaks and coast redwood following fire are altered by the presence of P. ramorum (Simler and others 2018). However, the recovery of species following fire and the role of P. ramorum in changing the composition of the plant community is unknown. This analysis uses repeated plot surveys of tree diameter, species composition, and ground fuels (Browns transect fuel measurements), performed between 2006 and 2018, to improve understanding of these interactions.

    This talk will explore the recovery of a few key species following fire in plots with or without evidence of P. ramorum invasion prior to the 2008 Basin Complex fire. We performed previous analysis on the prevalence of several common species looking at presence or absence of P. ramorum and fire return interval. We found a significant difference in the prevalence of California-lilac species (Ceanothus spp.), a known soil nitrogen fixing plant, between plots with medium or long fire return intervals where P. ramorum tested positive. We expect to see decreased post-fire abundance of tanoak and oak species on plots invaded by P. ramorum prior to burning, and that plots on which P. ramorum has never been isolated will have greater postfire abundance of those species. The decrease should be independent of the time since the burn, indicating a possible change in the composition of the plant community when compared with uninfected and unburned plots. These changes should be driven by significantly higher pre-fire fuels accumulations documented at plot establishment and in 2012 and 2013 plot surveys.

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    Rose, Jacqueline; Cobb, Richard. 2020. Fire and sudden oak death's effect on species prevalence in Big Sur, California. In: Frankel, Susan J.; Alexander, Janice M., tech. cords. Proceedings of the seventh sudden oak death science and management symposium: healthy plants in a world with Phytophthora. Gen. Tech. Rep. PSW-GTR-268. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 35-36.

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