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Home NEWS Science News

Biochar provides high-definition electron pathways in soil

Bioengineer by Bioengineer
April 3, 2017
in Science News
Reading Time: 2 mins read
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ITHACA, N.Y. – All plants need electrons to aid biological and chemical tasks. Cornell University scientists have discovered a new high-definition system that allows electrons to travel through soil farther and more efficiently than previously thought.

"Microorganisms need electrons for everything they do. If they consume nutrients or spew out methane or expel carbon dioxide – for any living, biological process – they need electrons," said Tianran Sun, postdoctoral researcher in soil and crop sciences and lead author of the paper that appears March 31 in Nature Communications.

Like large volumes of electricity that flow from Niagara Falls throughout upstate New York, electrons convey through soil via carbon. "We weren't aware of this high-definition soil distribution system transporting electrons from far away. It's not kilometers, it's not meters, but centimeter distances that matter in soil," said Johannes Lehmann, professor of soil science.

In fact, amending the soil with pyrogenic carbon – known as biochar – brings high definition to the electron network. In turn, the electrons spur conductive networks and growth, said Sun.

"Previously we thought there were only low-performing electron pathways in the soil – and now we've learned the electrons are channeled through soil very efficiently in a high-performing way," said Lehmann.

Lehmann and the members of his laboratory had struggled to understand why microorganisms thrived in the presence of biochar. The group removed soil phosphorus, making the environment inhospitable. They ruled out water and nutrients. They discarded the use of biochar as a food source because microorganisms cannot consume much of it. Through Sun's background in environmental chemistry, the scientists found that microorganisms may be drawn to electrons that the biochar can transport.

"These results will lead to a better understanding of microbial responses in soil and microbial metabolism, including long-term effects on greenhouse gas emissions," Sun said.

###

The National Science Foundation and the U.S. Department of Agriculture funded this research.

Cornell University has television, ISDN and dedicated Skype/Google+ Hangout studios available for media interviews. For additional information, see this Cornell Chronicle story.

Media Contact

Melissa Osgood
[email protected]
607-255-2059
@cornell

http://pressoffice.cornell.edu

############

Story Source: Materials provided by Scienmag

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