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Pacific Southwest Research Station
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 fifth 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.
Lowering stand density reduces mortality of ponderosa pine stands - As trees grow larger in even-aged stands, competition develops among them. Competition weakens trees, as they contend for soil moisture, nutrients, and sunlight. Competition also increases trees’ risk to bark beetles and diseases, and subsequently leads to a buildup of dead fuels. A recent study, led by Dr. Jianwei Zhang, research forester at the U.S. Forest Service's Pacific Southwest Research Station, considered if the onset of this risk could be determined. The study, which appears in the Canadian Journal of Forest Research, also considered if the relationship between density and mortality varies with site quality as ponderosa pine stands developed. [Read the full news release at www.fs.fed.us/psw/news/2013/20131125_PonderosaPineStands.shtml]
Woodland salamanders indicators of forest ecosystem recovery - Woodland salamanders are a viable indicator of forest ecosystem recovery, according to researchers from the U.S. Forest Service's Pacific Southwest Research Station. PSW Research Wildlife Biologist Dr. Hartwell Welsh and Garth Hodgson examined two species of woodland salamanders across four stages of tree development at Mill Creek—a disturbed old-growth redwood forest in northern California. [Read the full news release at www.fs.fed.us/psw/news/2013/20130828_Salamanders.shtml]
USDA Plans Regional “Climate Hubs” - USDA plans to create seven “Regional Climate Hubs” to work in partnership with producers and foresters. The hubs will provide outreach and extension to farmers, ranchers, and forest landowners on science-based risk management and will seek to partner with the land grant universities, Extension, and the private sector. Each hub will be the center of a network of connected activities and services and will be located in a USDA facility within its region. The Forest Service will work closely with other USDA agencies, including the Agricultural Research Service (ARS) and the Natural Resource Conservation Service (NRCS) to support the hubs. PSW leadership is actively involved in representing our numerous research products and partnerships in California and Hawaii. As decisions are announced on the particulars of locations and organization in California and Hawaii, we will post them here.
For more information on the planned Climate Hubs, check out USDA Regional Hubs for Risk Adaptation and Mitigation to Climate Change (PDF 1 MB)
Students help with research on the Kings River Experimental Watersheds - Six students from Sierra High School in Prather, Calif. spent three days conducting research on the Kings River Experimental Watersheds. They helped install resin-bead lysimeters (water collectors) that measure nitrogen deposition and fluxes for a year across an entire watershed. This work helps PSW researchers evaluate the impact of air pollution on the forest and soils and understand how forests are using nutrients. The students also learned about watershed condition, air pollution and Yosemite toad monitoring. This is the second consecutive year that staff from PSW-Fresno has hosted students through the school's Environmental Adventures program, a vocational training for environmental sciences which was funded by the U.S. Forest Service.
Missed it when it was new? Browse the What's New archive.
Robert Z. Callaham. 2013. Pinus ponderosa: geographic races and subspecies based on morphological variation. Res. Pap. PSW-RP-265. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 53 p.
Mortenson, Leif A.; Halperin, James J.; Manley, Patricia N.; Turner, Rich L., eds. 2013. Proceedings of the international workshop on monitoring forest degradation in Southeast Asia. Gen. Tech. Rep. PSW-GTR-246. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 56 p.
Robert Z. Callaham. 2013. Pinus ponderosa: a taxonomic review with five subspecies in the United States. Res. Pap. PSW-RP-264. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 52 p.
Global Climate Change
|Last Modified: Dec 2, 2013 02:26:56 PM|