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<p>for both surface runoff and water flowing into streams through subsurface or <a href="page.php?w=groundwater">groundwater</a> flow. Riparian zones can play a role in lowering nitrate contamination in surface runoff, such as manure and other <a href="page.php?w=fertilizer">fertilizer</a>s from <a href="page.php?w=Field_%28agriculture%29">agricultural fields</a>, that would otherwise damage <a href="page.php?w=ecosystem">ecosystem</a>s and human health. Particularly, the attenuation of <a href="page.php?w=nitrate">nitrate</a> or <a href="page.php?w=denitrification">denitrification</a></p><p>
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