Mixed Prairie Grasses Are Better Biofuel Source
8 December 2006
A new study led by David Tilman, Regents Professor of Ecology in the University of Minnesota’s College of Biological Sciences, indicates that mixtures of native perennial grasses and other flowering plants provide more usable energy per acre than corn grain ethanol or soybean biodiesel and are far better for the environment.
The findings are published in the Dec. 8 issue of the journal Science and featured on the cover.
Biofuels made from high-diversity mixtures of prairie plants can reduce global warming by removing carbon dioxide from the atmosphere. Even when grown on infertile soils, they can provide a substantial portion of global energy needs, and leave fertile land for food production.—David Tilman, Regents Professor of Ecology in the University of Minnesota's College of Biological Sciences
Based on 10 years of research at Cedar Creek Natural History Area, the study shows that degraded agricultural land planted with highly diverse mixtures of prairie grasses and other flowering plants produces 238% more bioenergy on average, than the same land planted with various single prairie plant species, including monocultures of switchgrass.
Tilman and two colleagues, postdoctoral researcher Jason Hill and research associate Clarence Lehman, estimate that fuel made from this prairie biomass would yield 51% more energy per acre than ethanol from corn grown on fertile land. This is because perennial prairie plants require little energy to grow and because all parts of the plant above ground are usable.
Fuels made from prairie biomass are carbon negative—producing and using them actually reduces the amount of carbon dioxide (a greenhouse gas) in the atmosphere. This is because prairie plants store more carbon in their roots and soil than is released by the fossil fuels needed to grow and convert them into biofuels. Using prairie biomass to make fuel would lead to the long-term removal and storage of from 1.2 to 1.8 US tons of carbon dioxide per acre per year. This net removal of atmospheric carbon dioxide could continue for about 100 years, the researchers estimate.
In contrast, corn ethanol and soybean biodiesel are carbon positive, the researchers contend, meaning they add carbon dioxide to the atmosphere, although less than fossil fuels.
Switchgrass, which is being developed as a perennial bioenergy crop, was one of 16 species in the study. When grown by itself in poor soil, it did not perform better than other single species and gave less than a third of the bioenergy of high-diversity plots.
Switchgrass is very productive when it’s grown like corn in fertile soil with lots of fertilizer, pesticide and energy inputs, but this approach doesn’t yield as much energy gain as mixed species in poor soil, nor does it have the same environmental benefits.—Jason Hill
To date, all biofuels, including cutting-edge nonfood energy crops such as switchgrass, elephant grass, hybrid poplar and hybrid willow, have been produced as monocultures grown primarily in fertile soils.
The researchers estimate that growing mixed prairie grasses on all of the world’s degraded land could produce enough bioenergy to replace 13% of global petroleum consumption and 19% of global electricity consumption.
The practice of using degraded land to grow mixed prairie grasses for biofuels could provide stable production of energy and have additional benefits, such as renewed soil fertility, cleaner ground and surface waters, preservation of wildlife habitats, and recreational opportunities.
There are 30 million acres of grasslands in the US Conservation Reserve Program (CRP), which pays farmers to manage land to benefit the environment. Current CRP regulations do not allow prairie grasses grown on this land to be used for renewable energy, but the US Farm Bill could be revised to accommodate this practice.
The research was supported by the University of Minnesota Initiative for Renewable Energy and the Environment and by the National Science Foundation (NSF).
“Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass”; David Tilman, Jason Hill, Clarence Lehman; Science 8 December 2006: Vol. 314. no. 5805, pp. 1598 - 1600 DOI: 10.1126/science.1133306
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