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Pioneering landscape-scale research releases first findings
Date:5/16/2008

The May issue of the Canadian Journal of Forest Research presents the preliminary findings of 23 scientists involved in one of the first landscape-scale experiments on how forest management affects western Ponderosa pine ecosystems.

The Blacks Mountain Interdisciplinary Research team includes U.S. Forest Service, Humboldt State University, Oregon State University, U.C. Riverside, University of Georgia and Wildlife Conservation Society scientists collaborating in research on large-scale manipulation of an ecosystem type extending from Mexico to Canada.

They present their findings in seven articles published as a special forum called, Ecological Studies in Interior Ponderosa PineFirst Findings from Blacks Mountain Interdisciplinary Research.

The research is intended to examine how controlled burns and changes in forest structure affect fire risk, retention of old-growth trees, insect infestations, wildlife and soils. It involved 12 plots of about 250 acres each in the 10,000-acre Blacks Mountain Experimental Forest in Northern Californias Lassen National Forest.

The site was selected because stands of old-growth trees can still be found on the experimental forest and research data collected from the site dates back to 1938, one of the oldest records of manipulation of a North American forest.

The scientists thinned stands so they either maintained a variety of sizes reminiscent of pre-settlement conditions or created a single canopy layer of even-aged trees characteristic of when loggers harvested the largest trees. They also completed controlled burns in half of each plot.

The team found that five years after thinning occurred, tree and stand growth significantly increased, and was even higher in even-aged stands with a single canopy layer.

This suggests that in the absence of treatments like thinning and controlled burns, old-growth characteristics will be lost as a result of lower growth rates a
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Contact: Roland Giller
rgiller@fs.fed.us
510-559-6327
US Forest Service, Pacific Southwest Research Station
Source:Eurekalert

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