Title: The secret life of microbes: soil bacteria and fungi undaunted by the harvesting of fire-killed trees
Author: Smith, Jane; Meznarich, Paul.
Source: Science Findings 153. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 5 p.
Station ID: SF-PNW-153
Description: Soil health is fundamental to ecosystem health. Disturbances such as fire and timber harvesting can affect the abundance, activity, and composition of soil microbial communities and thus affect soil productivity. In response to forest managers, scientists with the Pacific Northwest Research Station compared health and productivity indicators between soils disturbed by logging machinery to adjacent soils that were burned but not mechanically disturbed after a wildfire in the Deschutes National Forest in central Oregon.
After a wildfire, one management option is to remove fire-killed trees. Postfire logging recoups some of the economic value of the timber and reduces the fuel available for future fires. Prior to this study, little was known about how harvesting activities might affect soils already exposed to disturbance by fire.
Scientists found that microorganisms essential to soil health appeared resilient to compaction from harvest machinery and to deep tilling (subsoiling). However, these mechanical disturbances appeared to reduce soil nutrients, such as nitrogen and phosphorus, in forms that are readily available for plant uptake. Over two years, the differences in nutrients between the disturbed and undisturbed sites lessened as microbial diversity increased and communities changed in composition.
Keywords: fire, soil, salvage logging, Deschutes National Forest, Jane E. Smith
View and Print this Publication (2.79 MB)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to email@example.com to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Smith, Jane; Meznarich, Paul. 2013. The secret life of microbes: soil bacteria and fungi undaunted by the harvesting of fire-killed trees. Science Findings 153. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 5 p..