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Fingerprinting fugitive dust: Tracking soil microbes back to their source

Date:
July 22, 2011
Source:
USDA/Agricultural Research Service
Summary:
Each community of soil microbes has a unique fingerprint that can potentially be used to track soil back to its source, right down to whether it came from dust from a rural road or from a farm field, according to a soil scientist.

Soil microbes can be used to trace dust to its source. Here soil microbiologist Ann Kennedy checks a computer map that shows the location of various biological groupings across the Columbia Plateau in Washington State.
Credit: Photo by Jack Dykinga

Each community of soil microbes has a unique fingerprint that can potentially be used to track soil back to its source, right down to whether it came from dust from a rural road or from a farm field, according to a U.S. Department of Agriculture (USDA) soil scientist.

Ann Kennedy, at the Agricultural Research Service (ARS) Land Management and Water Conservation Research Unit in Pullman, Wash., studies the biological properties of soils that affect wind erosion. She analyses the soil for the fatty acid or lipid content from the community of soil microbes living in the soil. It is this lipid content that forms the living community's fingerprint.

ARS is USDA's principal intramural scientific research agency.

Although Kennedy focuses on the soils of the Columbia Plateau region, which spans parts of Idaho, Oregon and Washington State, she also works with ARS scientists in Colorado, Idaho, Missouri and Texas on fingerprinting soils. The scientists exchange soil samples to study a variety of soils from different regions.

Interestingly, microbial communities from dirt and gravel roads differed from adjacent agricultural soils, whether in Washington or Texas. Apparently, the microbial communities found on roads change with time because of the lack of plants and restricted water infiltration on roads, compared to cropland.

Ultimately, Kennedy and her colleagues are looking for management practices that will keep the soil from blowing in the first place.

Read more about this research in the July 2011 issue of Agricultural Research magazine at: http://www.ars.usda.gov/is/AR/archive/jul11/wind0711.htm

Kennedy has published papers on this research in Soil Biology and Biochemistry and the Soil Science Society of America Journal, as well as abstracts for the American Society of Agronomy and the North American Agroforestry Conference.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Fingerprinting fugitive dust: Tracking soil microbes back to their source." ScienceDaily. ScienceDaily, 22 July 2011. <www.sciencedaily.com/releases/2011/07/110721112607.htm>.
USDA/Agricultural Research Service. (2011, July 22). Fingerprinting fugitive dust: Tracking soil microbes back to their source. ScienceDaily. Retrieved April 19, 2014 from www.sciencedaily.com/releases/2011/07/110721112607.htm
USDA/Agricultural Research Service. "Fingerprinting fugitive dust: Tracking soil microbes back to their source." ScienceDaily. www.sciencedaily.com/releases/2011/07/110721112607.htm (accessed April 19, 2014).

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