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- Title
ZUR REGIONALEN LIMNOLOGIE VON UPPLAND.
- Authors
Willén, Torbjörn
- Abstract
During the summers 1951-1953 a number of lakes and streams in Uppland and northern Smáland have been examined mainly with regard to colour. transparency, pH, and specific conductivity. The tube of KALLE for the determination of the colour of the sea has been employed for the first time on a larger scale in inland lakes. The province of Uppland contains within its boundaries lakes which vary widely with regard to colour, pH, and contents of electrolytes. The variation in pH and the spec. conductivity are largely explicable by the varying occurrence of lime in the different parts of the province (Fig. 4). Also rather strongly humic waters, 6-200 mg Pt/1, occur in Uppland, mainly iii the north and north- west, where there are large bogs and forests. The connection between the different factors is set forth. It is also possible to show that lakes at greater height above sea-level as a rule exhibit a lower content of electrolytes. Along the coast gradually new lagoons and lakes arc cut off from the innermost bays of the Bothnian Gull. and the lakes of the system of Utål have been selected for the examination of lakes in different phases of isolation. The colour of the lakes has been examined partly by application of LUND- QVIST' s scale (the subjective method), partly by measurements with the tube of KALLE. By the latter, objective method the values obtained could be correlated with corresponding colour regions in the spectrum. The types of lakes in Uppland have been examined starting from increasing autotrophy and increasing tyrfotrophy respectively (Fig. 22). In this connection the types of lakes in Uppland distinguished earlier by LUNDQVIST (1925) and ALMQVIST (1929) have been discussed. In certain cases an attempt has been made to compare the values obtainted in Uppland and Småland, yet the material from Småland, by its small volume, does not permit of far-reaching comparisons and conclusions. In Småland variations of transparency and colour within one and the same drainage system could be studied.
- Subjects
LAKES; BODIES of water; HYDROGEN-ion concentration; ELECTROLYTES; COLOR; TRANSPARENCY (Optics)
- Publication
Oikos, 1954, Vol 5, Issue 1, p25
- ISSN
0030-1299
- Publication type
Article