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Healthy rivers needed to remove nitrogen
Date:3/12/2008

t. This hyporheic flow intermixes with the river water and limits the anaerobic processes. It also underscores the importance of maintaining healthy in-stream communities so the nitrogen is taken up by the ecosystem in other ways.

Gregory says too many river systems have lost their natural channels to human activities and have essentially become pipelines for drainage. The original, braided channels many rivers had were complex, played a major role in slowing and filtering the river water, and provided natural habitat for native and migrating fish.

Past studies by Gregory and others have pointed out how these pipeline river channels harm fish and their eggs during floods. The new study suggests that these pipelines also limit the potential of the river to absorb nitrogen that humans add to the system through a variety of activities.

The Oregon studies focused on Oak Creek basin in Corvallis, the Calapooia River near Albany, and the McKenzie River near Eugene. Each study basin looked at the streams in forested, agricultural and urban areas.


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Contact: Stan Gregory
stanley.gregory@oregonstate.edu
541-737-1951
Oregon State University
Source:Eurekalert

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