Abstract
The phytoplankton primary production was studied in different types of six soft-water, weakly-mineralized karst lakes: Kschara, Sankhar, Yukhor, Poridovo, Svetlen’koye, and Bol’shiye Garavy (Vladimir oblast). The following aspects were studied: seasonal dynamics, vertical distribution of the photosynthetic intensity, relative algal photosynthetic activity, the relationships between production processes and water transparency, BOD5, and the concentrations of total forms of nitrogen and phosphorus. It was revealed that the maximal photosynthesis rate depends more on the total nitrogen than on the total phosphorus. A close correlation was found between the maximal photosynthesis rate and BOD5.
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