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Chemical characteristics were investigated using water samples collected at 54 sites in Lake Takkobu and 8 inflow and outlet sites in the summer 2004. Concentrations of 9 elements (Na, Ca, K, Mg, Cl, SO4 , D-Fe, D-Mn and D-Si) in this lake were strongly influenced by the Takkobu River. The concentrations of TP, TN, Chl.a, SS, pH and DO were higher in the north than in the south, as reflected by the occurrence of Anabaena spiroides, while those of Na, Cl and D-Mn were also higher in the north than in the south, influenced by the Takkobu River. On the other hand, the concentrations of SRP, D-Fe, DOC, DIC, Mg and Ca were distributed differently from the above constituents. Principal component analysis (PCA) using 13 dissolved chemical constituents was conducted to find the environmental gradients to determine the heterogeneity of the chemical characteristics in the south lake. The factor loadings of the first PC showed high values in DIC, Ca, Mg, DOC, SRP and D-Fe, and showed low value in SO4 . Those of the second PC showed high in Na, Cl and D-Mn, and showed low in D-Si. Those of the third PC were high in K. The heterogeneity of water chemistry in the south lake is explained by the following environmental gradients: firstly redox potential, secondly water from the southern wetland and/or spring water, and thirdly submerged vegetation.

Water quality and factors influencing its distribution in Lake Takkobu