Abstract
The results of the study of the quantitative relationships between solar radiation (integral radiation and PAR), the content of nutrients, and the spring bloom parameters in the Ucha Reservoir are presented. Positive significant correlations between the date of peak bloom and the sum of light intensity over the period from the 35the to the 40th days (the upper reaches of the reservoir, station Pestovo) and the period from the 44th to the 49th days (the lower reaches of the reservoir, station Listvyanka) were determined on the basis of a retrospective analysis of the data from the period of 1993–2003. Regression equations were derived, which permit forecasting the start of phytoplankton growth in spring according to the results of solar radiation measurements. The sum of light intensity over the course of 50 calendar days in each years correlate positively with the phytoplankton abundance in spring (the highest daily number of algae and integral estimation of algae number in spring).
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