Studies on plankton of the large-and middle-sized reservoirs in Shandong Province-III. Relationship between phytoplankton and environmental factors

摘要: The relationships between the total biomass of phytoplankton (TB), the biomass of nannophytoplankton (nanB) and the biomass of each main phytoplankton group, respectively, and the eight kinds of physical and chemical factors are reported. According to the correlation, the important factors to the phytoplankton in sequence are total phosphorus (TP). chemical oxygen demand (COD), hardness (H), the Sechi disc depth (SD) and the average reservoir depth (Z). Generally, TP, COD and H are positively, but SD and Z negatively, related to the phytoplankton. The relationships between TB and the factors, and nanB and the factors tend to be similar. In the main phytoplankton groups, Cryptomonas-Euglena are most closely related to the factors, and Cyanophyta are less closely related to the factors. The relationships between the main phytoplankton groups and the important factors are similar to those between TB and the factors, except that the percentage of Bacillariophyta biomass is remarkably positively related to SD.