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February 10, 2016

Grassland biofuels could benefit people and birds in Wisconsin and beyond

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Grassland bioenergy could be a win-win for Wisconsin’s farmers and its wildlife.

A new University of Wisconsin-Madison and Wisconsin Department of Natural Resources study shows that converting marginal farmlands to perennial grassland biofuel crops could spell big gains for both landowners and birds in Wisconsin. It could support a host of other natural benefits, too, from creating habitat for pollinators to keeping nutrients in the soil and out of waterways.

“In southern Wisconsin and throughout the Midwest, we expect a lot out of our landscapes,” says study co-author Monica Turner, the Eugene P. Odum Professor of Ecology and a Vilas Research Professor. “This study can give guidance to landowners on how to maintain multiple natural benefits while making a living off their land.”

The study does not suggest farmers take their hardest working lands out of crop production, rather, it demonstrates that switching marginal, highly-erodible farmlands to soil-stabilizing grasslands could instead help produce valuable bioenergy crops while also supporting birds.

“You can accomplish a lot more with less if you are careful about where you convert your land,” says lead author Peter Blank, a former postdoctoral researcher who is now a science coordinator at the American Bird Conservancy. “Being thoughtful about where we put grassland crops can increase their usefulness to birds.”

Using data from an earlier field study, which showed birds’ affinity for potential grassland bioenergy crops over annual row crops - namely corn - the researchers developed and analyzed 36 scenarios to see how bird populations might respond to increases in bioenergy production at a regional scale.

The scenarios focused on an 80 km radius around Madison, an area that includes the team’s field sites and the UW-Madison Charter Street power plant, which was formerly slated to incorporate biomass. Due to the region’s soil and climate, it is representative of Midwestern landscapes that are rife with bioenergy production potential.

The team found that even a 10 percent conversion of corn to grassland crops would substantially increase the number and variety of birds. In some cases, clustering grasslands doubled bird diversity when compared to smaller patches of randomly placed grasslands.

Many grassland birds prefer big clumps of habitat over smaller, isolated fragments, including some bird species considered most threatened, Blank explains. These include the grasshopper sparrow, eastern meadowlark and dickcissel – birds which were once common sights in Wisconsin, but whose populations have drastically declined in recent decades.

“Using grassland for bioenergy is a potential way to bring some of them back,” says Blank.

Grassland bioenergy is still awaiting the R&D breakthrough and market to allow it to go big, Turner says, but even if bioenergy doesn’t take off in the near future, converting marginal lands from row crops to perennial grassland crops still has much to offer.

“A big challenge we face as a society is figuring out how to have our landscapes provide the benefits we need while not degrading nature,” says Turner. “Growing perennial crops on marginal lands will avoid the competition between growing food and fuel on the same land.”

Most land-use changes are what Turner calls an “uncontrolled experiment,” the result of a series of small decisions made with little knowledge of the potential outcomes, which can sometimes lead (for better or for worse) to surprises.

“This kind of study allows us to look at how local land-use decisions could play out over the regional landscape,” says Turner.

The study was published in Ecological Applications and supported by the Water Sustainability and Climate project and Wisconsin Department of Natural Resources.

This story was also published in UW-Madison News.