Abstract：
:The long-term (40 yr) observation results of phosphates-phosphorus concentration and its runoff in the Lithuanian fourth largest river Nevezis are analysed. Amounts and peculiarities of background runoff, agricultural runoff, and point source pollution from towns were studied for various periods. It has been determined that phosphates enter into the river Nevezis mainly from towns (76.5%), from agriculture only up to 16%, and the background runoff for 7.5%. Considerable agricultural influence was observed in 1979-1991, when the phosphate runoff increased to 22 kg P km(-2) a(-1) and formed in 1984 33% of the entire runoff. A relation of the phosphates runoff from agriculture, for the entire study period, was obtained with the number of animals in the river's basin. Since 1990, when the number of animals started to decrease, the runoff of phosphates decreased too. Now the phosphates runoff from agriculture formed only 2% of the entire runoff. Water in the river Nevezis is heavily polluted with phosphate, according to the EU general classification of the water quality of rivers, although the Lithuanian pollution norms for effluents discharging to surface water are not exceeded. Norms for effluents discharging in the rivers from point-sources pollution should be made stricter and the highest permitted ratio between the phosphorus load in the river and its water discharge should be established.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Sileika AS,Kutra S,Berankiene Ldoi
10.1023/a:1016311701199subject
Has Abstractpub_date
2002-09-01 00:00:00pages
153-67issue
2eissn
0167-6369issn
1573-2959journal_volume
78pub_type
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