History of abandoned urban sites found stored in soil

Process of urban soil being studied, Detroit offers natural laboratory setting

2012-04-10

(Press-News.org) April 5, 2012 - Old houses and vacant lots may not look like much to the naked eye, but to some, the site is better than gold. Excavations over the years can create a challenge to study what's left behind and often appears as if dirt and debris ended up mixed in a blender then pressed by a giant trash compactor.

However, in Detroit, one scientist and geologist is finding some of the city's abandoned lots provide a surprising "natural laboratory" for studying certain processes involved in soil formation; particularly the weathering of rocky and mineral objects within the soil layers. Jeffrey Howard's analyzed soil in the heart of the Motor City since he first dug an experimental pit on the site of a demolished building a few blocks away from his office at Wayne State University. And Howard says what he's been finding ever since, continues to amaze him, leading to his newest research.

"With an urban soil, we know what 'time zero' is," says Howard. "We don't know that as well in nature." If he's working on a vacant lot where the building was demolished in 1969, for example, "that's when the soil started to form." Howard's learned he can further date the processes in his "natural laboratory" by digging at sites where a dated cornerstone or other historical record tells him exactly how long the processes have been taking place. He's also finding Detroit the perfect starting place, where urban soil is slowly revealing the city's story as a world leader from the Industrial Revolution through World War II, to the now dramatic contraction of surplus houses, abandoned factories and crumbling landmarks.

The results map the passage of time, showing some of the old underground debris may be having a beneficial effect in certain polluted soils. And he's finding a mix of manipulated conditions. Howard says,"They didn't know that's what they were doing then, but scientifically, now we're able to see something that we otherwise wouldn't have seen. And that's huge."

### See the complete results from this study in the just released, online only publication, Soil Horizons, at: https://www.soils.org/publications/sh/articles/53/2/6

This featured article of SH is available for free access at https://www.soils.org/publications/sh until the next quarterly issue.

Soil Horizons https://www.soils.org/publications/sh aim is to share the importance of soil science with a larger audience. It features stories celebrating the diversity and critical impact of soil scientists and their work. Soil Horizons also serves as an outlet for the publication of peer-reviewed papers on global issues and solutions in the study of soils, along with emerging challenges, ideas, unique field experiences, and findings. But these papers may break from the traditional to explore everything from case studies as examples of a larger issue, to experiential papers with implications for further study or changes in practice. Soil Horizons is published by the Soil Science Society of America.

The Soil Science Society of America (SSSA) is a progressive, international scientific society that fosters the transfer of knowledge and practices to sustain global soils. Based in Madison, WI, SSSA is the professional home for 6,000+ members dedicated to advancing the field of soil science. It provides information about soils in relation to crop production, environmental quality, ecosystem sustainability, bioremediation, waste management, recycling, and wise land use.

SSSA supports its members by providing quality research-based publications, educational programs, certifications, and science policy initiatives via a Washington, DC, office. Founded in 1936, SSSA celebrates its 75th Anniversary this year (2011). For more information, visit www.soils.org or follow @SSSA_soils on Twitter.

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History of abandoned urban sites found stored in soil

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