Nutrient Distribution Characteristics and Pollution Evaluation of Pond Sediment in Luanwu Road,Shijiazhuang,Hebei Province
The pond of Shijiazhuang city Luanwu road,is used to be studied as a typical research object.Sediment samples in the pond were collected by the cylindrical sediment sampler and taken from the surface layer(0~9 m).The spatial distributions of the total nitrogen,total phosphorus and total organic matter were analyzed,and did the pollution risk assessment of sediments.The results showed that:the contents of total nitrogen(TN)in the sediments ranged from 1.33 to 1.91 g·kg-1,the total nitrogen content in southern part of the pond is higher than the northern part of the pond,the pollution of the pond was Ⅳ level.The contents of total phosphorus(TP)in the sediments ranged from 202 to 1 190 mg·kg-1,the total phosphorus content in southern part of the pond is higher than the northern part of the pond,the pollution of the pond was mild pollution or middle level pollution.The contents of organic matter(OM)in the sediments ranged from 2.59%to 5.08%,the pollution of the pond was clean.There is a significant positive correlation between organic matter and total nitrogen,but no correlation between total phosphorus and total nitrogen,indicating that the main form of total nitrogen is organic nitrogen,and the main form of total phosphorus is inorganic phosphorus.TOC/TN indicated that the organic in the sediments came from land-sourced pollutant.