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Assessment of Water Quality and Identification of Pollution Sources of Plateau Lakes in Yunnan (China)

^a Lab. of Quantitative Vegetation Ecology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, P. R. China
^b Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
^c Environmental Monitoring Center of Yunnan Province, Kunming 650000, P. R. China

View larger version (31K): [in this window] [in a new window]   Fig. 1. The location of 10 plateau lakes in the Yunnan Province of China.

View larger version (10K): [in this window] [in a new window]   Fig. 2. Scree plot of the characteristic roots (eigenvalues) of principal component analysis.

View larger version (30K): [in this window] [in a new window]   Fig. 3. Box-whiskers plots of the major water quality variables highly correlated with three significant principal components. (a) Caohai; (b) Waihai; (c) Yangzong; (d) Fuxian Hu; (e) Xingyun Hu; (f) Qilu Hu; (g) Yilong Hu; (h) Erhai; (i) Chenghai; (j) Lugu Hu.

View larger version (12K): [in this window] [in a new window]   Fig. 4. Dendrogram from hierarchical cluster analysis (Ward's method) based on 21 water quality variables for 10 plateau lakes from 2000 through 2004.