草海表层沉积物有机碳、氮、磷分布特征及污染评价

本文以浅水型湖泊草海为研究对象,系统地研究了营养盐在草海湿地沉积物中的分布规律和来源,并采用单因子指数法对沉积物中TOC、TN和TP的污染程度进行了评价。结果表明:草海表层沉积物的TOC、TN含量普遍较高,且具有显著的同源相关性;TP含量相对较低,且与TN不同源。E区及近岸区域沉积物中TOC、TN和TP的陆源污染相对较重。草海沉积物TOC和TN含量足以造成严重的生态毒性效应;而TP对环境产生的危害较小。草海各采样区表层沉积物TOC和TN的污染程度为S区>N区>E区,TP的污染程度为E区>S区>N区。

The Distribution Characteristics and Pollution Evaluation of Organic Carbon, Nitrogen and Phosphate in Surface Sediments of Caohai Lake

The distributions and sources of organic carbon, nitrogen and phosphorus in the surface sediments of Caohai Lake were analyzed. The single factor index method was used to appraise the pollution of TOC, TN and TP in the surface sediments. The results showed that the TOC and TN contents in the surface sediments of Caohai Lake were high, and bad a significant homology correlation, while the TP content was relatively low and had a different source from TN. The terrestrial pollution of TOC, TN and TP in the sediments of East zone and nearby shore area was in a serious situation. The contents of TOC and TIN contained in sediments of Caohai Lake were enough to cause serious level of ecological toxic effects. However, pollution degree of TOC and TN was S 〉 N 〉 E and the damage to the environment caused by TP was small. The pollution degree of TP was E 〉 S 〉 N.