Concentrations and concentration time trends of nutrients in streams and reservoirs, nutrient retention, and nutrient source apportionment were evaluated for the Zelivka catchment during the period 1993–2000. Kendall’s seasonal trend test with flow-adjustment revealed a downward non-significant trend for total nitrogen concentrations and an upward non-significant trend for total phosphorus concentrations. The average annual nutrient retention in reservoirs and streams in the Zelivka catchment has been calculated at 1185 t N and 12 t P. A source apportionment showed that diffuse sources contributed on average 81% of total nitrogen loads and 11% of total phosphorus loads during the period 1998–2000. The average loss of total nitrogen and total phosphorus from agricultural areas amounted to 25 kg N/ha (1993–2000) and 0.04 kg P/ha (1998–2000), respectively.
Pracoviště
Hydrobiologický ústav (do r. 2005)
Kontakt
Václava Lavičková, lavickova@hbu.cas.cz, Tel.: 387 775 889
Rok sběru
2006
Počet záznamů: 1
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