Distribution Characteristics and Source Analysis of Nitrogen and Phosphorus in Different Rivers in Two Water Period: A Case Study of Pi River and Shiting River in the Upper Reaches of Tuo River in China.

Figure 4 also shows that in the wet season, the WTN concentration in the Pi river varied little from the upstream to the downstream, ranging from 0.681–1.54 mg·L −1 , with an average value of 0.993 mg·L −1 , while the WTN concentration in the Shiting river first showed an increasing trend, then a slight decrease, and then an increase, with the WTN concentration in the range of 1.20–10.4 mg·L −1 and an average of 3.27 mg·L −1 .

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