应用主成分法和聚类分析法分析吕四渔场近岸海水水质

应用主成分法和聚类分析法对2005年5月吕四渔场近岸海水中16个水质指标的监测数据进行了分析研究。结果表明:D IN的超标率最高,达57.1%,Zn空间变异最为明显;D IN与水温相关性明显,这已被人们所认识;TPH与营养盐(D IN、PO43--P)有较好的正相关性;主成分因子(f1,f2,f3)中,f1的贡献率达37.76%,其可能代表的是外来污染源的影响;各水质因子可大致聚为三类,第一类由D IN、TPH、Cu、DO、As、PO43--P和Cd组成,表明它们与其它各因子相关性变化程度是基本相同的。此外,本文提出了三点建议,以供监测参考。

An analysis on the inshore water quality on the Lusi fishing grounds by principal component analysis (PCA) and cluster analysis

The quality of inshore water on the Lusi fishing grounds in May 2005 was analysed by using principal component analysis(PCA) and cluster analysis.The results showed that ratio of beyond standard(RBS) of DIN was the highest,reaching 57.1%,and spatial variation of Zn was the most obvious.DIN and water temperature bore a good relevance,and coefficients among TPH and DIN,PO_4~3——P had a higher positive correlation.Among three principal component factors(f_1,f_2,f_3),f_1 contributed 37.71%,which perhaps represented the external sources of pollution.All seawater items could be roughly classified into three kinds,of which the first kind was composed of DIN,TPH,Cu,DO,As,PO_4~3——P and Cd,which indicated that their changes with other factors were basically identical.Moreover,three proposals were herein put forward.