Long-term changes of phosphorus and nitrogen content and of trophic status in heated Konin lakes
1994
Zdanowski, B. (Inland Fisheries Institute, Olsztyn (Poland))
Basing on the content of phosphorus and nitrogen in winter, on the Secchi disc visibility, on chlorophyll density and on primary production assessed, the trophic status was described for 5 heated lakes. The status depended on mineral fraction of phosphorus available to phytoplankton which in turn depended on the precipitation of phosphates and of calcium
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