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    Subsoiling is becoming a standard practice to alleviate detrimental soil compaction following biomass harvesting in eastside pine and mixed conifer forests in California. Compaction of soil following the harvesting can be detrimental to growth of residuals, to establishment of natural regeneration, and may change long-term soil productivity. The short and long-term effects of this subsoiling practice on forest soil biodiversity and forest ecosystem function as a whole is not known. Because of wounding of tree boles and roots associated with subsoiling, some long-term detrimental effects may occur. Several Forest Pest Management biological evaluations suggested that only through monitoring could the effects be determined. In order to evaluate the impacts of subsoiling on root pathogens, insect vectors of root pathogens, and tree growth, Forest Pest Management, in cooperation with the Pacific Southwest Research Station and the Southern Research Station, initiated a long-term study on the Milford District, Plumas National Forest in 1993 to monitor these effects.

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    Kliejunas, John T.; Otrosina, William J. 1997. Progress report: effects of subsoiling study, Milford Ranger District, Plumas National Forest. Forest Pest Management Report Number R97-01. San Francisco, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Region. 10 p.

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