Evaluation and spatial distribution characteristic analysis of non-point source pollution in Shenyang

Taking township as basic unit, the discharge amount and rate of pollution contribution of TN, TP, NH3-N and COD have been researched with the export coefficient model and equal-standard pollution load method. The types of agricultural non-point sources include agricultural plant, rural life and scattered livestock and poultry farming. Results indicate that the main non-point pollution loads in Shenyang are TN and TP. The main pollution sources of TN and TP are scattered livestock and poultry farming and agricultural plant. Among the townships of Shenyang, the discharge amount of non-point source pollution in Kangping, Faku, Liaozhong and Xinmin is larger than that in Sujiatun, Dongling, Shenbei and Yuhong. The exurban zone of Shenyang is the key area to non-point source pollution control and prevention.