Michigan State University researchers say in the study that corn leads the “all-important” category of biomass yield. However, they add, “focusing solely on yield comes at a high price.”
“We believe our findings have major implications for bioenergy research and policy,” said Doug Landis, MSU entomologist and one of the paper’s lead authors. “Biomass yield is obviously a key goal, but it appears to come at the expense of many other environmental benefits that society may desire from rural landscapes.”
Landis and a team of researchers from the Great Lakes Bioenergy Research Center say they compared three potential biofuel crops: corn, switchgrass, and mixes of native prairie grasses and flowering plants. They measured the diversity of plants, pest and beneficial insects, birds and microbes that consume methane, a greenhouse gas that contributes to climate change. Methane consumption, pest suppression, pollination and bird populations were higher in perennial grasslands.
In addition, the team found that the grass crops’ ability to harbor such increased biodiversity is strongly linked to the fields’ location relative to other habitats. For example, pest suppression, which is already higher in perennial grass crops, increased by an additional 30 percent when fields were located near other perennial grass habitats. The finding suggests that in order to enhance pest suppression and other critical ecosystem services, coordinated land use should play a key role in agricultural policy and planning, Landis said.
“With supportive policies, we envision the ability to design agricultural landscapes to maximize multiple benefits,” he said.
However, rising corn and other commodity prices tempt farmers to till and plant as much of their available land as possible. This includes farming marginal lands that produce lower yields as well as converting acreage set aside for the Conservation Reserve Program, grasslands and wetlands.
Landis said that while corn prices in recent years have been attractive to farmers, with the exception of biomass yield, all other services were greater in the perennial grass crops.
“If high commodity prices continue to drive conversion of these marginal lands to annual crop production, it will reduce the flexibility we have in the future to promote other critical services like pollination, pest suppression and reduction of greenhouse gasses,” he said.
The research was funded by the Department of Energy, the National Science Foundation and MSU AgBioResearch.
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