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

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An view of a lake in the mountains surrounded by many dead trees among living trees in the forest.

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

Looking up toward the sky beneath the newly discovered tree species Osmoxylon ngardokense.

Celebrating the induction of the Republic of Palau's Ngarkok Nature Reserve into the Smithsonian Institution’s Forest Global Earth Observatory Network.

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
New application for measuring ponderosa pine in northern California
Screenshot from the watershed decision support tool.
General Technical Report 259 explains how to use the OP-Yield spreadsheet.

In 1978, PSW researchers Bill Oliver and Robert Powers developed yield tables for ponderosa pine plantations. Forty years later, Martin Ritchie and Jianwei Zhang have developed a spreadsheet adaptation of the Oliver and Powers yield tables called OP-Yield. It features some updated functions and greatly increased flexibility that offers land managers and land owners dynamic tables that overcome some of the limitations of the original model.

This General Technical Report explains how to use the OP-Yield spreadsheet and describes the 14 user-specified values that are used to generate forecasts. These forecasts can help managers anticipate needs for both pre-commercial and commercial thinning and anticipate when stands will be at risk for high bark beetle mortality.

For more tools developed by PSW researchers, and information from the Research Data Archive, visit our Research Tools & Data page.

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

There is no more iconic tree or more closely watched forest ecosystem than coast redwood. 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-256
Natural range of variation for yellow pine and mixed-conifer forests in the Sierra Nevada, southern Cascades, and Modoc and Inyo National Forests, California, USA

We conducted an indepth assessment of the natural range of variation of yellow pine and mixed-conifer forests for the assessment area, focusing on ecosystem processes and forest structure from historical data sources from pre-Euro-American settlement times.

Cover image psw-gtr-254
The California Spotted Owl: Current State of Knowledge

This conservation assessment represents a comprehensive review by scientists of the current scientific knowledge about the ecology, habitat use, population dynamics, and current threats to the viability of the California spotted owl (Strix occidentalis). It is based primarily on peer-reviewed published information with an emphasis on new scientific information that has emerged.

Last Modified: Apr 12, 2018 12:34:06 PM