Summary
The primary production was measured from May 1966 through April 1967, in the Thompson Lake, Southern Illinois. 14C, pH and O2 methods were used to study the entire community under natural conditions. During diurnal hours CO2 absorption occurred at a faster rate than O2 evolution. In late summer the CO2 uptake reached a maximum of 60 µmoles/l/hr, and O2 production reached a maximum of 36.3 µmoles/l/hr.
An investigation of inorganic phosphate absorption was made with labelled Na2P32O4. The percentage rate of 32P absorption was widely scattered within a range of 0.04%–0.30%/min during the period of October to April. The average phosphate uptake in winter and in spring was 60 µg/l/hr.
There is no indication of any direct relation between inorganic phosphate absorption rates and photosynthetic rates. A better correlation between temperature and inorganic phosphate absorption was observed. This shows that in the natural environment, temperature influences phosphate absorption more than other factors.
Résumé
La production primaire a été mesurée dans le lac du Thompson, Illinois du sud, entre mai 1966 et avril 1967. La communauté entière a été étudiée dans des conditions naturelles par les methodes 14C, pH, et O2. Pendant les heures diurnes l'absorption de CO2 était plus rapide que le dégagement d'O2. Vers la fin de l'été l'absorption de CO2 a atteint un maximum de 60 µmoles/litre/heure, et la production d'O2 a atteint un maximum de 36.3 µmoles/litre/heure.
Une investigation de l'absorption de phosphate inorganique s'est faite avec du Na2P32O4 marqué, le taux d'absorption de 32P pendant la période octobre-avril variait largement entre 0.04%–0.30%/min. En hiver et au printemps le taux moyen d'absorption de phosphate était de 60 µg/litre/heure.
Il n'existe aucune indication de rapport direct entre les taux d'absorption et de photosynthèse de phosphate inorganique. On a observé une meilleure correlation entre la température et l'absorption de phosphate inorganique, ce qui montre que dans des conditions naturelles, la température est le facteur qui influence le phus fortement l'absorption de phosphate.
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Wong, S.L. The measurement of primary production and its relation to inorganic phosphate absorption in a freshwater Lake. Hydrobiologia 34, 378–391 (1969). https://doi.org/10.1007/BF00045398
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DOI: https://doi.org/10.1007/BF00045398