Bučienė, A., Gaigalis, K.
Chemical composition of wet deposits and drainage runoff in
agroecosystems: the case of Middle Lithuania
The consistent patterns of chemical composition of wet
deposits and drainage runoff concentration have been permanently studied in two
stationary sites in the Middle Lithuania for the last decades since late 1980s.
The results of simultaneous observations presented in this paper show that the
concentration of SO4 -2–S, Mg+2, PO4 -3-P, NO3 --N, NH4 +-N and Ca+2 in wet
deposits positively correlates with the concentration of these ions in drainage
runoff water (R=0.59, 0.61, 0.51, 0.49, 0.42 and 0.35, correspondingly,
R05=0.35). A sharp decrease in SO4 -2–S concentration from 5.5 to 2.5 mg l-1
and periodical decrease versus increase in NO3 --N and NH4 +- N concentration
and load are determined in the agroecosystems studied from 1988–1989 with short
intervals to 2007. This outcome has mainly an economic character: impact of
changes in animal numbers, increase of transport load, fuel consumption and
industrial emissions.