Assessment of nitrogen pollution reduction options in the river Nemunas (Lithuania) using fyrisnp model

Abstract

The paper quantifies and discusses diffuse and point sources total nitrogen (TN) inputs as well as reduction options in the catchment of the main Lithuanian River Nemunas. Modelled average TN export bet wreeteennt i2o0n0 a0n–d2 0T0N6 fdreolm. L tohaed Rs iovfe Tr NN efmroumn adsi fcfautsceh amnedn pt otoin tth seo Buracletisc aSs ewa ewlla ass 3 r7e6te2n0t iotonn nheasv eT bNe eynr –e1 saticmcoarteddin fgo rto f itvhee sduabtcaa otcrihemnteendt sF oyfr itshNe PR mivoe-r pNeermceunntaags ei nocfl uadrainbgle tlhaen dex atnerdn laol aldo afdro fmro pmo iBnet lsaoruusrc. eAs.g Trihcue lmtuarein c poonitnritb suoteusr c7e4 i.n6p tuot 8is9 .p5o%or olyf ttrheea tTeNd wloaasdte, winactreera asti nKga wunitahs tchie- t5y6. .9T%he ocfo nthtrei btuottiaol ns ufrbocmat cfohrmesetn ltasn adr etoa. thTeh eT Nhi glohaeds ti nrectreenatsieosn f roofm T 2N. 2(%30 t.o7 %15) .8w%as w oibthse arnv eidn cirne atshee iNn eforirse srti vlaenr ds ufrbocmat c2h8m.5e tnot winipthu tt htoe tlhoew Besatl thicy dSreaau lbicy l1o1ad7 0(05 .5to5n nme sy rc–a1n). bSec eancahriieov medo bdyel liinnsgta sluligngge bstiso ltohgaitc tahle t rreeadtumcetinotn i nta rsgeewt afgoer tLreitahtumaenniat pfolar nntist riong aelnl Adissstreiscstm cietniets o afn tdh eb Fy ycroisnNvePr tminogd 2e0l %re soufl tasr ashbolew lsa nthda tto t hpea smtuordese lo cra inm bpele smucecnetastsifounll oy fa optphleier de qfouriv raivleenrt bmaseians umreasn aing eamgreinctu lptluarne-. ning in catchments outside the area where the model originally has been developed.