根據美國內布拉斯加州林肯大學研究人員，於7日所發表的大型農場研究報告顯示，用以製造生質燃油的柳枝稷(switchgrass)，在其生長、收成與製成纖維素乙醇(cellulosic ethanol)的過程中，其產生的能源量較預期需求達5倍之多。
這項耗時5年的研究同時也發現，從柳枝稷所淬煉出的纖維素乙醇與石化製品相較，前者溫室氣體排放量較後者估計值低了94%。
此研究的主要研究員弗格(Ken Vogel)，同時身兼美國農業部農業研究署與大學農業經營暨園藝系之遺傳學家，其表示，「研究結果明確地揭示了柳枝稷不僅是高效能的能源，並且可用於再生的生質燃油，以減少對石化燃料的依賴；同時，也可降低溫室氣體排放並提升農村經濟發展。」
弗格補充，多年生的作物如柳枝稷、作物的殘渣與森林裡的生物，在未來將發展成主要的纖維素乙醇來源，可望取代美國目前石油消費量的30%。
Switchgrass grown for biofuel production produced five times more energy than needed to grow, harvest and process it into cellulosic ethanol, finds a large farm study by researchers at the University of Nebraska-Lincoln published Monday.
The five year study also found greenhouse gas emissions from cellulosic ethanol made from switchgrass were 94 percent lower than estimated greenhouse gas emissions from gasoline production.
"This clearly demonstrates that switchgrass is not only energy efficient, but can be used in a renewable biofuel economy to reduce reliance of fossil fuels, reduce greenhouse gas emissions and enhance rural economies," said principal researcher Ken Vogel, a U.S. Department of Agriculture-Agricultural Research Service geneticist in the university's agronomy and horticulture department.
In the future, perennial crops, such as switchgrass, as well as crop residues and forestry biomass could be developed as major cellulosic ethanol sources that could potentially displace 30 percent of current U.S. petroleum consumption, Vogel said.
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