USDA Forest Service

Pacific Southwest Research Station
Pacific Southwest
Research Station

800 Buchanan Street
Albany, CA 94710-0011
(510) 883-8830
United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.
[image:] TreeSearch, links to

Giving you access to more than 45,000 online USDA Forest Service Research publications.

Keep in Touch
Facebook logoTwitter logoRSS logo
PSW on Twitter
In The News
Recent News Releases
PSW Publications List
PSW on the USDA Blog
What's new
Image of an American Pika perched on a rock.

New research suggests that American pikas can tolerate changes in climate better than expected.

A hoary bat is nestled in a pair of hands wearing leather gloves.

Researchers have documented hoary bats – the most widespread bat species in North America – flying at night using little to no echolocation during their mating season.

A view of the Caples Creek Watershed on the El Dorado National Forest.

Researchers from the California Academy of Sciences and PSW team up for a study to reduce high intensity wildfires and contribute to healthier forest ecosystems.

Chris Fettig holiding his 2017 Research and Development Deputy Chief's Award for Science Delivery.

Research entomologist Chris Fettig recently received the Forest Service's 2017 Research and Development Deputy Chief's Award for Science Delivery.

A screenshot of the title slide to the YouTube video, The Ohia: The Story of Hawaii's Tree.

The Ohia: The Story of Hawaii's Tree is a video featuring PSW researchers explaining the Ohia tree and the impacts of Rapid Ohia Death.

Science that makes a difference.

The Pacific Southwest Research Station is a world leader in natural resources research through our scientific excellence and responsiveness to the needs of current and future generations.

We represent the research and development branch of the USDA Forest Service in the states of California and Hawaii and the U.S. affiliated Pacific Islands. Our mission is to develop and communicate science needed to sustain forest ecosystems and their benefits to society.

[image-text]: Featured Science
Tree Mortality in California: Fire management in the face of tree mortality across large landscapes
A photo of Diane Delany in the lab.
Download "Wildfire Risks in Beetle-Killed Trees Link to Time From Death" to learn more about how bark beetle infestation in forests leads to tree mortality.

Fire exclusion, past and ongoing harvesting practices, and livestock grazing have changed forest structure and species composition in many western forests. Altered fire regimes have increased the density of trees, decreased overall tree size, and increased surface fuel loads.

Forest managers seek to modify fire behavior by reducing fuels through thinning or prescribed burning. Creating forest structures that can reduce fire severity across a large landscape may decrease the need for aggressive firefighting strategies and could eventually reduce the costs of wildfire suppression.

In addition, forests in California are experiencing large-scale, tree mortality. Recent research shows that treatments, including both mechanical thinning and wider-use of prescribed fire, are needed to reduce the density of trees and fuels in many of today’s forests.

Learn about our latest research on tree mortality in California, with videos and information on drought, bark beetles, wildfire risks and restoration strategies.

[image-text]: Recent Publications
Cover image psw-gtr-257
Passive monitoring techniques for evaluating atmospheric ozone and nitrogen exposure and deposition to California ecosystems

In this report, several alternative approaches for estimating N deposition are also considered as a guide for selecting appropriate techniques in ecosystem-effects studies in California and elsewhere.

Cover image psw-gtr-258
Proceedings of the Coast Redwood Science Symposium—2016: past successes and future direction. Proceedings of a workshop

With its limited range and high value, the coast redwood forest is a microcosm of many of the emerging science and management issues facing today’s forested landscapes.

Cover image psw-gtr-259
OP-Yield Version 1.00 user’s guide

OP-Yield is a Microsoft Excel™ spreadsheet with 14 specified user inputs to derive custom yield estimates using the original Oliver and Powers (1978) functions as the foundation. It presents yields for ponderosa pine (Pinus ponderosa Lawson & C. Lawson) plantations in northern California.

Last Modified: May 2, 2018 01:05:56 PM