We studied two similar riparian sites in southern New England and examined ground water nitrate (NO~--N) removal in the subsurface of mowed (i.e., herbaceous) v . forested (i.e., woody) vegetation. Each site consisted of poorly drained, fine to medium sands and contained adjacent areas of mowed and forested vegetation. We dosed mesocosms with bromide and lSN labeled NO~-N amended ground water t...