Douglas-fir Regeneration after a High Severity Wildfire (image) Portland State University Share Print E-Mail Caption Tree boles remain standing 20 years later after the wildfire that killed them on Grider Ridge in northern California. Naturally regenerating Douglas-fir sapling emerge from the shrub fields. Credit Courtesy of Jeff Shatford Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.