The characteristic values of these two axes were 0.164 and 0.09936, respectively. The explanation degree reached 62.15%, indicating that the two sequencing axes could efficiently demonstrate the mutual relationship between phytoplankton in Shihoudian Lake and different environmental factors. The abbreviations of environmental factors and the codes for phytoplankton are listed in Tables 2 and Fig. 2. Oscillatoria positively correlated with NO2-N and DO. Kruskopf and Plessis (2006) proposed that nitro- gen had the greatest influence on Oscillatoria growth, fol- lowed by ferric iron and phosphorus, which was similar to the present study.
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