Abstract: Taking the agricultural non-point source pollution of 14 cities and prefectures in Hunan Province as the research object,the non-point source pollution survey and assessment method based on unit analysis was used to calculate the agricultural non-point source pollution of Hunan Province from 2005 to 2019, and its change trend, spatial difference and influencing factors were studied. The results showed that from 2005 to 2019, the total amount and emission intensity of COD, TN and TP pollution from agricultural non-point sources in Hunan Province showed a downward trend as a whole; the spatial differences of the total amount of COD, TN and TP pollution emissions from agricultural non-point sources in 14 cities and prefectures showed an upward trend. The spatial differences of COD and TP pollution emission intensity showed a trend of first increasing, then decreasing, and then increasing, and TN showed first increasing and then decreasing. There was an inverted “U-shaped” Kuznets Curve relationship between COD, TN and TP pollution emission intensity from agricultural non-point sources and agricultural economic growth in Hunan Province. In addition, the improvement of urbanization level, the reduction of the use of chemical fertilizers and pesticides per unit area, and the increase in the proportion of agriculture and forestry could significantly reduce agricultural non-point source pollution.

Key words: agricultural non-point source pollution, Environmental Kuznets Curve, spatial differences, Hunan Province