Pre-epidemic mortality rates for common Phytophthora ramorum host tree species in California

摘要: Understanding the impacts of Phytophthora ramorum on forests will require knowledge pre-disease distribution, abundance, and rates change for affected species. This study estimated pre-epidemic mortality nine common host tree species: bigleaf maple (Acer macrophyllum), California bay laurel (Umbellularia californica), black oak (Quercus kelloggii), canyon live chrysolepis), coast agrifolia), Douglas-fir (Pseudotsuga menziesii), madrone (Arbutus coastal redwood (Sequoia sempervirens), tanoak (Lithocarpus densiflorus) using inventory data from 1981 to 1984 1991 1994 statewide inventories private (and some public) forest land. Mortality that were developed represent average annual trees at least 12.5 cm in diameter 1.4 m above ground (dbh) time first (1981-1984) inventory. Natural all was 0.5 percent per year, with individual species ranging 0.1 0.6 percent. Overall, growth exceeded natural harvest most between 1994. Tanoak, numerous quarantined counties, increased volume number by more than 15 over decade.