摘要
通过对广西北部湾典型入海河流南流江上、中、下游城市河段表层沉积物碳、氮、磷的调查分析,揭示其富集特征,并利用单因子直接评价法、内梅罗综合污染指数法与有机指数法对沉积物污染状况进行了评价。结果表明:(1)上游河段沉积物中总有机碳(TOC)、总碳(TC)、总氮(TN)、总磷(TP)平均质量浓度分别为9.2、21.4、1.6、0.126g/kg,中游河段分别为13.9、23.8、1.1、0.083g/kg,下游河段分别为9.8、12.6、0.9、0.082g/kg。(2)从Pearson相关分析可知,TP、TN、TC、总无机碳(TIC)两两间均具有显著相关性,表明碳、氮、磷的来源具有一定的同源性。(3)从单因子评价结果看,TN污染最严重;从内梅罗综合污染指数来看,中游河段污染最严重,上游次之,下游最优;从有机指数来看,3个城市河段总体均处于Ⅲ级(高营养)水平。
Based on the survey of surface sediment nutrients （C,N,P） in urban parts along upriver to downriver of a typical river bounding for sea in Beibu Gulf, namely Nanliujiang River, enrichment characteristics were analyzed. The pollution status was assessed by using single-factor index, Nemerow index and organic index. Results showed that ： （ 1 ） the mass concentrations of TOC, TC, TN, TP in upriver were 9.2,21.4,1.6,0.126 g/kg, respectively ; those in midriver 13.9,23.8,1.1,0.083 g/kg, respectively; those in downriver 9.8,12.6,0.9,0.082 g/kg,respectively. （2） Based on the Pearson correlation analysis, TP, TN, TC and TIC were all significantly correlated, indicating that car- bon,nitrogen and phosphorus might come from the same sources. （3） Single-factor index showed that TN was the most polluted factor; as Nemerow index showed,midriver was the most polluted parts,while upriver second and downriver third; from organic index,the urban parts of Nanliujiang River were at high level nutrition pollution （Level Ⅲ）.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2016年第7期36-41,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.41361022)
广西北部湾重大基础研究专项(No.2011GXNSFE018003、No.2012GXNSFEA053001)
关键词
北部湾
入海河流
沉积物
碳
氮
磷
富集特征
Beibu Gulf
river bounding for sea
sediment
carbon
nitrogen
phosphorus
enrichment characteristics
