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[VD07] Phosphorus in lakes
State

Key message
Neutral

In Slovenia, nutrient overloading is still the basic problem concerning lakes and reservoirs, and from 2006 to 2019, no improvement is observed. In the assessment period 2016–2019, only 4 out of 11 lake water bodies were determined to be in good or very good trophic status. Overloading of lakes with phosphorus is usually a result of inadequate wastewater drainage and intensive agriculture in the watershed area.

Charts

Figure VD07-1: Annual average concentration of the total phosphorus (µg P/l ) in lakes and reservoirs in selected periods
Sources:

Unified database of water quality monitoring, Slovenian Environment Agency, 2021 (28. 01. 2021)

Show data
  Unit Perniško jezero Ledavsko jezero Gajševsko jezero Šmartinsko jezero Slivniško jezero Blejsko jezero Bohinjsko jezero Velenjsko jezero Klivnik Mola Vogršček
2006-2008 micro g P/L 135 114 137 59 57 13 4 62 10 17 9
2009-2015 micro g P/L 232 96 109 60 39 12 5 55 11 14 13
2016-2019 micro g P/L 259 87 113 51 49 13 5 80 12 17 16
Figure VD07-2: The trophic status assessment of lakes and reservoirs based on phytoplankton
Sources:

Unified database of water quality monitoring, Slovenian Environment Agency, 2021 (28. 01. 2021)

Show data
  Perniško jezero Ledavsko jezero Gajševsko jezero Šmartinsko jezero Slivniško jezero Blejsko jezero Bohinjsko jezero Velenjsko jezero Klivnik Mola Vogršček
2006 - 2008           0,58 0,96        
2009 - 2015 0,25 0,34 0,32 0,47 0,44 0,58 0,94 0,52 0,71 0,70 0,60
2016 - 2019 0,23 0,28 0,29 0,44 0,42 0,60 0,95 0,65 0,63 0,69 0,71
Figure VD07-3: Annual average transparency expressed as Secchi depth (m) in lakes and reservoirs in selected periods
Sources:

Unified database of water quality monitoring, Slovenian Environment Agency, 2021 (28. 01. 2021)

Show data
  Unit Perniško jezero Ledavsko jezero Gajševsko jezero Šmartinsko jezero Slivniško jezero Blejsko jezero Bohinjsko jezero Velenjsko jezero Klivnik Mola Vogršček
2006-2008 Secchi depth (m) 0,3 0,5 0,6 1,0 1,1 7,2 9,3 4,7 3,1 2,4 2,6
2009-2015 Secchi depth (m) 0,3 0,5 0,5 1,2 1,2 5,9 9,1 6,3 3,3 2,8 2,0
2016-2019 Secchi depth (m) 0,2 0,6 0,6 1,2 1,5 6,2 10,6 7,9 3,7 2,5 2,4

Methodology

Date of data source summarization
Last modified
01.03.2021
Author(s)

Špela Remec Rekar, Nataša Dolinar, Katarina Novak, Slovenian Environment Agency