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[verwijderd] 14 februari 2007 12:35

Show menu | ScienceDaily home pageRSS feeds | Free newsletterSource: University of Minnesota
Date: December 11, 2006
More on: Energy and the Environment, Renewable Energy, Nature, Global Warming, Sustainability, Agriculture and Food

Fuels Made From Prairie Biomass Reduce Atmospheric Carbon Dioxide
Science Daily — Highly diverse mixtures of native prairie plant species have emerged as a leader in the quest to identify the best source of biomass for producing sustainable, bio-based fuel to replace petroleum.

Mixed prairie grasses have emerged as a leader in the quest to produce biofuels. (Credit: Cedar Creek LTER Site)A new study led by David Tilman, Regents Professor of Ecology in the University of Minnesota's College of Biological Sciences, shows 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.

"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," Tilman said.

The findings are published in the Dec. 8 issue of the journal Science and featured on the cover.

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 percent 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 percent 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," which means that 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 U.S. 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," 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," said 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 percent of global petroleum consumption and 19 percent 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 U.S. 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 U.S. Farm Bill could be revised to accommodate this practice, Tilman added. Doing so would have important economic, environmental and energy security benefits.

"It is time to take biofuels seriously," Tilman said. "We need to accelerate our work on biomass production and its conversion into useful energy sources. Ultimately, this means we need to start paying farmers for all the services they provide society -- for biofuels and for the removal and storage of carbon dioxide."

The research was supported by the University of Minnesota Initiative for Renewable Energy and the Environment and by the National Science Foundation (NSF). Cedar Creek Natural History Area has been an NSF Long-Term Ecological Research (LTER; www.lter.umn.edu/) site since 1982.

Note: This story has been adapted from a news release issued by University of Minnesota.

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03har 14 februari 2007 13:23

Is er ook een probleem bij deze oplossing !!!!
Har.

Serpa 16 februari 2007 22:17

Mooi stukje, verband met stork ?

[verwijderd] 17 februari 2007 20:10

Geen verband met stork, doch het is belangrijk dat dit in wijde kring bekend wordt.

03har 19 februari 2007 15:58

quote:
larsenterry schreef:
Geen verband met stork, doch het is belangrijk dat dit in wijde kring bekend wordt.

Kun je dan niet veel beter een ander gremium gebruiken, of in ieder geval een drukker bezocht forum
Har

[verwijderd] 20 februari 2007 07:38

'Stork verliest patentzaak in kippenkoeling'20 feb 2007, 07:37 uur
Amsterdam (BETTEN BEURSMEDIA NEWS) - Stork heeft een jarenlange octrooizaak verloren tegen het bedrijf TopKip uit Enschede. Dat meldt Het Financieele Dagblad dinsdag. De zaak diende voor de zogenoemde Oppositie Afdeling van het Europees Octrooibureau (EOB) in Munchen.

TopKip kreeg een octrooi op 17 maart 2004 voor zijn zogeheten 'combi chilling'-procede. Hierbij worden geslachte kipkuikens die een temperatuur hebben van 39 graden Celsius via een innovatief procede tweemaal zo snel afgekoeld en tegelijkertijd inwendig gereinigd.

De zogeheten 'oppositie' tegen het octrooi werd door Stork zelf aangespannen op 16 december 2004, zo blijkt uit processtukken die in het bezit zijn van het FD.

Directeur-eigenaar van TopKip, Ary Dirkzwager, bevestigt dat zijn bedrijf in eerste aanleg de octrooizaak heeft gewonnen. Stork ontkent de octrooizaak te hebben verloren, aldus een woordvoerder tegenover de krant.

Stork heeft tot 9 maart de tijd om de beslissing van het EOB aan te vechten.

(c) BETTEN BEURSMEDIA NEWS (tel: +31 20 710 1756; fax: +31 20 710 1875)

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