Nutrients distribution characters and its appraisement inshore area in Jiangsu province

There are mostly the mucky plain coasts in Jiangsu coastal zone,its development and utilization method is dominated by agriculture,there are significant relationship between the nutrition salts pollutant mass concentration distribution and the farmland chemical fertilizer employment intensity,therefore,understanding and discussing the degree and distribution of the nutrition salts pollution near seacoast of Jiangsu is very significant.According to the characteristics of Jiangsu sea coast regions,choose 19 sites of the seacoast region as the study case,analyze total nitrogen,total phosphorus,inorganic nitrogen and phosphate nutritional quality of pollutant concentration of these 19 sites.Firstly,we discussed the distributed characteristic of these nutrient salt pollutant along coastal direction and to sea direction in Jiangsu seacoast regions,then integrated with sea water quality standard,assessed the pollution degree by the method of equivalent standard pollution index and comprehensive pollution index.The result show that north and south ends and middle parts of Jiangsu coast have higher nutrient salts contaminants,but the mass concentration of the near of central radiation sandbar and between the north and south ends is lower which show a "W" shape.Nutrient concentration of pollutants has a changed trend,that is,near the coast have a higher concentration,but slightly lower away from the coast.In the evaluation of pollution levels,the equivalent standard pollution index of total phosphorus generally more than one.So the pollution is more serious.But the pollution of total nitrogen is lighter,that the equivalent standard pollution index is also more than one and the integration pollutant index is from 1.63 to 14.08.The pollution level of Jiangsu coast has more obvious differences which perform as North-South index high and the middle of the index low.At last,with the situation of sewage discharged into the sea and the application of agricultural chemical fertilizer,the article discuss the distribution of nutrient salts pollution in Jiangsu coastal waters.