Characterizing and explaining spatio-temporal variation of water quality in a highly disturbed river by multi-statistical techniques.

A highly significant positive spatial autocorrelation ( α < 0.01) is found for NH 3 -N in the dry season, suggesting that geographically neighboring stations have similar levels of NH 3 -N concentration.

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For COD, 9 stations, mostly located in Jialu, Qingyi and Fen rivers, indicate a significant decreasing trend during the dry season with an exception of station Mawan located in the downstream of the Pingdingshan City, which is showing an increasing trend.

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In the wet season, a decreasing trend is observed from the analysis at 5 stations located in the downstream region in the cities Zhengzhou, Xuchang and Luohe, while a significant increasing trend is observed at two stations on the upper Sha River.

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