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Table 2

Mann–Kendall test results in yearly average TP concentration in the periods of 2004–2007, 2007–2012, 2012–2017, respectively

ZMainstreamJinsha RiverMin RiverTuo RiverJialing RiverWu River
2004–2007 − 1.70 − 0.34 − 1.70 − 0.34 − 0.34 − 0.34 
2007–2012 2.25* 2.25* 0.37 1.88 1.13 1.50 
2012–2017 − 2.63* − 1.88 − 0.75 1.50 − 0.75 − 1.13 
ZMainstreamJinsha RiverMin RiverTuo RiverJialing RiverWu River
2004–2007 − 1.70 − 0.34 − 1.70 − 0.34 − 0.34 − 0.34 
2007–2012 2.25* 2.25* 0.37 1.88 1.13 1.50 
2012–2017 − 2.63* − 1.88 − 0.75 1.50 − 0.75 − 1.13 

*Indicates Z exceeds the critical value of ±1.96 (α = 0.05), representing the trend as significant. Z > 0 and Z < 0 represented the time series for TP concentration having an upward trend and a downward trend.

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