河北省石家庄市栾武路坑塘底泥营养物质分布特征及污染评价

Nutrient Distribution Characteristics and Pollution Evaluation of Pond Sediment in Luanwu Road,Shijiazhuang,Hebei Province

以石家庄栾武路坑塘为研究对象,利用柱状底泥分层采样器采集0~9m坑塘沉积物样品,研究分析总氮(TN)、总磷(TP)、有机质(OM)的空间分布特征,并对沉积物进行污染风险评价,结果表明:沉积物TN含量在1.33~1.91g·kg^(-1),空间分布特征为坑塘南部>坑塘北部,为Ⅳ级污染程度;总磷含量在202~1190 mg·kg^(-1),空间分布特征为坑塘南部>坑塘北部,总体表现为轻中度污染;沉积物有机质含量在2.59%~5.08%,为尚清洁状态;坑塘沉积物有机质及总氮呈显著正相关但与总磷无相关性,表明沉积物总氮以有机氮为主要形态,总磷以无机磷为主要形态;TOC/TN表明坑塘沉积物中的有机质多来自于陆源污染。

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 wasⅣlevel.The contents of total phosphorus(TP)in the sediments ranged from 202 to 1190 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.