%0 Journal Article %T Changes of the concentrations of dissolved chemical compounds migrating into ground water through biogeochemical barriers in an agricultural landscape %A Lech Szajdak %A Irena yczy¨˝ska-Ba oniak %A Renata Jaskulska %A Marek Szczepa¨˝ski %J Oceanological and Hydrobiological Studies %@ 1897-3191 %D 2009 %I %R 10.2478/v10009-009-0048-y %X Forms of nitrogen (N-NO3-, N-NH4+, N-org) and phosphorus (P-PO4-3, P-org) were investigated in ground and surface water as well as in precipitation and run-off. The highest concentration of all the investigated compounds was determined in the drain and in run-off. This investigation shows that afforestations and small ponds function as very efficient biogeochemical barriers with regard to N-NO3- and P-PO4-3. They do not, however, limit the spread of P-org. %K ground and surface water %K nitrogen and phosphorus forms %U http://versita.metapress.com/content/t142864756548317/?p=ef22164c1dfc43a4b68964c6b4ea775f&pi=8