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

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

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
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
  1. 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