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 40,000 online USDA Forest Service Research publications.

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In The News
Recent News Releases

What's new
Photo of a researcher standing in a burned stand of trees with green regrowth on the forest floor.

Cal Poly and PSW recently signed an agreement to include the university's Swanton Pacific Ranch in the federal Experimental Forests and Ranges program. Read the full news release.

Still waters reflect a beautiful blue sky and surrounding landscape in Lake Valley in the Emigrant Wilderness. Photo taken by Jim Frazier.

Visit the new site for the Science Synthesis to Inform Plan Revisions Within the Northwest Forest Plan Area. Research will inform the revision of management plans for 19 national forests.

A fisher kit climbing between two branches of a tree

Researchers explain how toxins from illegal marijuana farms are threatening fishers and other species of conservation concern in our latest news release.

A YouTube screenshot on how to detect a tree infected with Ohia wilt.

Our researchers are working with the University of Hawaii and other partners to spread awareness on Rapid Ohia Death. Visit the Hawaii Forestry Extension website to learn about the disease.

A fire burning low to the ground. Smoke rises from the burned area on the right and unburned forest debris is on the ground on the left.

We provide scientific information to enable managers to work with fire to perform its ecological function while minimizing extreme events. Learn more about our fire science research.

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 primary work occurs in California (the most populous state with the eighth-largest economy in the world) and Hawaii (a strategic location in the Pacific Rim economies and tourism).

Our mission is to develop and communicate science needed to sustain forest ecosystems and their benefits to society.

[image-text]: Featured Science
Looking toward the sky at green trees mixed with dead trees impacted by insects, pollution and drought.
Ozone, drought and bark beetle effects on ponderosa pine in the San Bernardino Mountains.

November 2015: Climate Change

Consortium for Integrated Climate Research in Western Mountains

The Consortium for Integrated Climate Research in Western Mountains grew from a grassroots initiative in the early 2000s, fueled by the concerns and interests of a cross section of physical and ecological scientists working in western North American mountain climate sciences. While coming from diverse disciplines, these scientists and those who align with the consortium share a common passion to improve and integrate understanding and applications about climate in western mountains and effects on ecosystems.

Climate driven changes to rainfall and streamflow patterns in a model tropical island hydrological system

Rising atmospheric CO2 and resulting warming are expected to impact freshwater resources in the tropics, but few studies have documented how natural stream flow regimes in tropical watersheds will respond to changing rainfall patterns. Results of the study suggest that if mean annual rainfall changes, stream flow regimes in tropical watersheds will also shift, with implications for water supply to downstream users and in stream habitat quality for aquatic organisms.

[image-text]: Recent Publications
Cover image psw-gtr-247
Trees of Yap: A Field Guide (GTR-PSW-249)

Descriptions, drawings, and photographs are presented for trees found on the Yap Islands in the Federated States of Micronesia. Included are all recorded native trees and most introduced trees as well as new records of native and introduced trees. Additional information is provided on tree distribution, status, and vernacular names in Micronesia.

Cover image psw-gtr-247
Science synthesis to support socioecological resilience in the Sierra Nevada and southern Cascade Range (GTR-PSW-247)

A team of scientists integrated recent research to inform forest managers, stakeholders, and interested parties concerned with promoting socioecological resilience in the Sierra Nevada, southern Cascade Range, and Modoc Plateau.

Cover image psw-rp-266
Using Fire Return Interval Departure (FRID) Analysis to Map Spatial and Temporal Changes in Fire Frequency on National Forest Lands in California (RP-PSW-266)

In California, fire regimes and related ecosystem processes have been altered by land use practices associated with Euro-American settlement, and climate warming is exacerbating the magnitude and effects of these changes.

Last Modified: Nov 23, 2015 10:50:31 AM