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Cropland diversity reduces nitrogen pollution
Date:2/11/2009

y, within a given area, a higher biodiversity of crops led to less dissolved nitrogen in surrounding water bodies. The explanation for this phenomenon, Broussard says, is difficult to discern.

"Diverse farms tend to have smaller fields with more edges, which can mean there's a greater buffering effect on nitrogen runoff by surrounding grasslands or woodlands," he says.

The researchers' results also showed that since 1906, the average aquatic nitrate concentration increased threefold in the entire U.S. and tenfold in the Iowa, Des Moines, and Minnesota Rivers, all of which fall in heavily tilled agricultural areas.

In areas where farming is scarce or absent, however, the authors found no perceptible change in dissolved nitrogen concentrations since the early 1900s. Broussard thinks this indicates that the impacts might be reversible if policy changes included incentives for farmers to rotate more crops, decrease their field size, increase the edges of fields and sizes of buffering zones, and incorporate more native perennial grasses into farms and in between fields.

"There has been great progress made to reduce the footprint of agriculture, but there is still room for improvement," says Broussard. "The American farmer is caught in a mode of production that has tremendous momentum and cannot be changed on the farm it's a policy question now."


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Contact: Christine Buckley
christine@esa.org
202-833-8773
Ecological Society of America
Source:Eurekalert

Page: 1 2

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