Factors Responsible for Retarding the Eutrophication Rate of Some Mesotrophic Lowland Lakes in N.E. Poland
✍ Scribed by Prof. Dr. Anna Hillbricht-Ilkowska
- Book ID
- 102869796
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 841 KB
- Volume
- 75
- Category
- Article
- ISSN
- 1434-2944
No coin nor oath required. For personal study only.
✦ Synopsis
The chemical composition of watershed waters supplying 13 mesotropliic lakes (in N.E. Poland) including as the deepest lake L. Haricza, z=108.5 m (summer total phosphorus [TP] content 50.050 mg . 1-1, chlorophyll a S 5 pg 1-1, SD 2.2.5 m) in a typical postglacial lake district (SuwalskiLaridscape Park) as well as surface and bottom waters of the lakes were studied in summer. Although the underestimated (i.e. including only surface runoff, river inflows and precipitation) ycarly TP loading is equal to or higher than the permissible value, the lakes have maintained their niesotrophic features for 20 to 30 years. P sorption to tho nllochthonous inorganic material as well as decalcification processes in the lakes are probably responsible for this situation, as there is it strong difference between the chemical content of supplying waters and lake waters and as there is a considerable enrichment of P on sestonic particles. As a consequence of the low bio-availability of P, the midsummer amount of chlorophyll a is lower than predicted from the "TP-chlorophyll-a" relation found for harmoniously eutrophicating (1.e. P-limited) lakes. Contents 1. Introduction .