关键词: 农业源污染, 化学需氧量(COD), 氨氮, 环境库兹涅茨曲线

Abstract: Features of the environmental Kuznets curve(EKC) potentially existing between the outputs of some main pollutants,i.e. COD and ammonia nitrogen,from agriculture in 2000-2009 and the economic development level in the same period in China are studied,and stage of the agricultural pollution and its ongoing tendedcy analyzed.Results show that the relationship between the outputs of COD and ammonia nitrogen from agriculture and the per capita agricultural GDP in 2000-2009 in China fits the features of EKC,suggesting that when the per capita agricultural GDP reaches ¥7037.04,the output of COD from agriculture arrives at an inflection point,where it is 14871400 tons;and when the per capita agricultural GDP reaches to ¥6513.03,the output of ammonia nitrogen from agriculture comes to an inflection point,where it is 1937200 tons.So if after 2009 the per capita agricultural GDP continues to grow at a rate of 5.76%,which was the lowest per capita agricultural GDP growth rate in 2000-2009,the output of ammonia nitrogen from agriculture will reach to an reflection point in the year of 2014 and the output of COD will in the year of 2016.Meanwhile,becase sharp differences exist between regions in output of the main pollutants from agriculture,in dustrial structure,demographic characteristics,and agricultural production,no obvious relationships that fie the EKC feature are found between the output of the main pollutants,i.e.COD and ammonia nitrogen,from agriculture and the per capita agricultural GDP in Liaoning,Jiangsu,Henan,Hubei,Guangdong,and Sichuan provinces.

Key words: agricultural pollution, chemical oxygen demand(COD), ammonia nitrogen, environmentalenvironmental Kuznets curve (EKC)