Fig. 3
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Principal component analysis (PCA) for the environmental variables of the Xiquanyan reservoir. Circle numbers 1–9, 10–18 and 19–27 indicate sampling in spring, summer and autumn, respectively. Environmental variables: DO = dissolved oxygen; Cond = conductivity; SD = water transparency; Turb = turbidity; Cl = chloride; TN = total nitrogen; NH = ammonium; NO = nitrate; TP = total phosphorus; COD = chemical oxygen demand; Chla = chlorophyll-a.
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