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Environmental Effects on Specific Rate of Photosynthesis in Small Fertilized Lakes (North‐west of the USSR)
Author(s) -
Tereshenkova T. V.
Publication year - 1985
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19850700403
Subject(s) - photosynthesis , phytoplankton , algae , biomass (ecology) , water column , nutrient , environmental science , phosphorus , seasonality , nitrogen , biology , botany , ecology , chemistry , organic chemistry
From 1975 to 1981, 136 diurnal values of P/B coefficients for the phytoplankton over the water‐column and 22 seasonal ones were obtained in 8 shallow fertilized lakes. A distinct direct correlation was found between the specific rate of photosynthesis and the temperature during the summer‐autumn season. In spring, the correlation was not so distinct; this period is characterized by higher photosynthetic activity of the phytoplankton due to a number of conditions favouring the development of algae: enrichment of water with nutrients, high daylight factor, and low biomasses in young populations of algae. An inverse correlation was found between the specific rate of photosynthesis and the phytoplankton biomass. The data obtained show that the introduction of nitrogen‐phosphorus fertilizers into the lakes (in the absence of unfavourable factors) greatly increases the daily P/B coefficients. The specific rate of photosynthesis and the morphometry of lakes were found to be correlated directly in small (up to 50 ha) lakes.