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

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Table 2 The level of significance for local spatial association analysis for water quality and trend

Station	Significance level of COD concentration		Significance level of NH₃-N concentration		Significance level of Sen’s slope of COD		Significance level of Sen’s slope of NH₃-N
Station	Dry season	Wet season	Dry season	Wet season	Dry season	Wet season	Dry season	Wet season
Chenqiao	0.33	0.29	0.35	0.88	0.90	0.96	0.58	0.99
Huangfuzhai	0.30	0.23	0.71	0.97	0.62	0.67	0.91	0.90
Baisha	0.24	0.26	0.23	0.39	0.58	0.49	0.46	0.42
Yangzhaizhong	0.86	0.72	0.60	0.40	0.60	0.45	0.48	0.44
Yewu	0.06 (LH)	0.09 (LH)	0.17	0.29	0.67	0.60	0.33	0.28
Mawan	0.38	0.42	0.23	0.23	0.97	0.92	0.28	0.23
Luodengqiao	0.24	0.26	0.23	0.39	0.49	0.38	0.35	0.51
Lifen	0.87	0.91	0.84	0.81	0.58	0.70	0.80	0.83
Gaocunqiao	0.19	0.21	0.92	0.99	0.31	0.29	0.51	0.80
Taochengzha	0.48	0.56	0.93	0.86	0.99	0.55	0.89	0.97
WuLiuzha	0.72	0.70	0.09 (LH)	0.16	0.77	0.87	0.32	0.36
Zhifang	0.81	0.86	0.99	0.92	0.44	0.55	0.63	0.62
Dawangzhuang	0.79	0.95	0.06 (HH)	0.67	0.71	0.56	0.05 (LL)	0.21
Baidukou	0.88	0.91	0.71	0.86	0.91	0.89	0.64	0.67
Chengwan	0.53	0.41	0.41	0.78	0.84	0.85	0.40	0.57
Qianxiangwan	0.33	0.40	0.03 (HH)	0.00 (HH)	0.00 (LL)	0.72	0.00 (LL)	0.02 (LL)
Zhidian	0.87	0.91	0.84	0.81	0.58	0.70	0.80	0.83

A statistic in italic mean the station is the center of a cluster, or an outlier, for water quality statistics with significance level less than 0.1. LH, HH and LL represent “low–high”, “high–high” and “low–low” spatial pattern