Nitrogen leakage from different land use types : a comparison between the watersheds of Graisupis and Vardas, Lithuania

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In this study the nitrogen leakage from different kinds of land use is investigated in Lithuania. The overall aim is to develop an easy, fast and cheap methodology, in order to measure nitrogen leakage. Thus, a method used in the Genevad drainage basin, Sweden, was applied (Wickberg, 2000). The latter uses an established relationship between nitrate/nitrite and conductivity in order to count for the nitrogen leakage. Another part of the aim is to present a new method of land use mapping at the Lithuanian Institute of Water Management. The study includes a comparision between the watersheds of river Graisupis, an agricultural region, and river Vardas, in a more hilly part of the country. In order to carry out the study, land use maps, based on aerial photos from 1995, was created and water samples were collected and analysed. The data material was then analysed and presented with statistical- and GIS- methods. A Digital Elevation Model (DEM) was used together with an application writ...