Figure 2 Water quality test results on the 7th section from January to December (a. Dissolved oxygen; b. Chemical oxygen demand; c. Ammonia nitrogen; d. Total phosphorus; e. Hypermanganate index)
Figure 2 1-December 7 section water quality test results (a. dissolved oxygen; b. chemical oxygen demand; c. ammonia nitrogen; d. total phosphorus; e. high mammothate index)