摘要
基于南流江干流上六司桥、横塘、江口大桥、南域和亚桥5个断面2011~2019年的溶解氧、高锰酸盐指数、五日生化需氧量、氨氮、化学需氧量、总磷等6个指标年均值,利用主成分分析法计算了包含所有水质指标信息的主成分综合得分值,通过Sperrman秩相关系数法分析了主成分综合得分值的变化趋势,再运用Pearson相关系数法分析主成分综合得分值和水中污染物浓度及排放量间的关系。结果表明:六司桥和横塘2个断面综合得分均为正数,下游江口大桥、南域和亚桥3个断面综合得分均为负数,南流江干流下游水质好于上游水质,六司桥、南域和亚桥断面呈现好转趋势,横塘和江口大桥断面呈现不断恶化趋势,南流江水体中氨氮、总磷和五日生化需氧量是南流江的主要污染因子。
This study is based on the average values of DO,COD Mn,BOD 5,NH 3-N,COD,TP for the five sections of the main stream of the Nanliu River from 2011to 2019,including the Liusi Bridge,Hengtang Bridge,Jiangkou Bridge,Nanyu and Ya Bridge.Principal Component Analysis(PCA)was used to calculate the comprehensive scores including all water quality indexes.The Sperrmanrank correlation coefficient method was used to analyze the chan-ging trend of PCA comprehensive scores.Pearson Correlation Coefficient method was used to analyze the relationship between the PCA comprehensive scores and concentrations and emissions of pollutants in water.The results show that the PCA comprehensive scores of the two sections of LiusiBridge and Hengtang Bridge are all positive,and the PCA comprehensive scores of the three sections of Jiangkou Bridge,Nanyu and Ya Bridge were all negative.The wa-ter quality in the lower reaches of the main stream of the Nanliu River is better than that in upstream.The sections of Liusi Bridge,Nanyu and Ya Bridge show a trend of improvement,while the sections of Hengtang Bridge and Jiangkou Bridge show a trend of deterioration.NH 3-N,TP and TP and BOD 5 are the main pollution factors in Nan-liu River.
作者
林卉
蓝月存
许园园
黄伯当
滕云梅
Lin Hui;Lan Yuecun;Xu Yuanyuan;Huang Bodang;Teng Yunmei(Ecological and Environmental Monitoring Center of Guangxi Zhuang Autonomous Region,Nanning,Guangxi 530028,China)
出处
《绿色科技》
2020年第10期10-14,24,共6页
Journal of Green Science and Technology
基金
广西社会科学重点课题(编号:gxsk201605)。
关键词
主成分分析法
Spearman秩相关系数法
Pearson相关系数法
南流江
水质评价
Principal Component Analysis method
Spearman rank correlation coefficient method
Pearson Correla-tion Coefficient method
Nanliu River
water quality evaluation
