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In search of wildlife-friendly biofuels
Date:10/1/2009

ecent expansion in land planted to corn involves land previously used to grow other crops. But there is evidence that more and more land that had been enrolled in the federal Conservation Reserve Program (CRP) is also being converted to crop production.

CRP is a voluntary program that pays rent to landowners to convert their agricultural land to natural grasslands or tree cover, reducing soil erosion, improving water quality and benefiting wildlife. In September 2007, the amount of land enrolled in the CRP peaked at 36.8 million acres.. Just one month later, in October 2007, CRP lands had declined by 2.3 million acres. And the Food, Conservation and Energy Act of 2008 capped CRP land at 32 million acres by 2010.

CRP land has been shown to help native birds survive and thrive. CRP lands have added an estimated 2.1 million ducks annually to the fall flight over North America's prairies. On the other hand, converting CRP land to cropland threatens the grassland birds and mammals there, Flaspohler and Fargione's paper says. A study of the value of CRP land to grassland birds in North and South Dakota indicated that nearly two million birds of five species would be lost without the CRP in those two states.

Conversion of grassland to corn also has a potentially significant negative impact on freshwater ecosystems. Intact grasslands retain soil and nitrogen. Land planted continuously to corn releases significant amounts of nitrates to freshwater systems. When these nitrogen-laden waters real the Gulf of Mexico, they contribute to algal blooms, creating "dead zones" where low oxygen levels make it difficult for fish and other aquatic wildlife to survive. Soil draining off cropland increases sediment in fresh water, raising temperatures and degrading the habitat of fish such as trout.

What's the solution? There are at least two ways to produce bioenergy without destroying wildlife, habitat, the researchers say. One is to use biomass sou
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Contact: Jennifer Donovan
jdonovan@mtu.edu
906-487-4521
Michigan Technological University
Source:Eurekalert  

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