基于主成分分析的巢湖水质影响因子研究

利用1987～2003年的水质监测资料,运用主成分分析法和Matlab软件,分析了巢湖水质的主要影响因子及其相互关系。相关分析表明,TP与TN、CODCr与TP和TN、浮游植物生物量与Chl-a和TN之间均有较好的正相关,而SD与TP、TN和CODCr之间有较好的负相关。主成分分析表明,TP、TN、CODCr、SD、Chl-a及浮游植物生物量是影响巢湖水质的主要因子,磷是巢湖富营养化的重要影响因子,TP、TN、CODCr及浮游植物生物量共同决定了水质的SD。结果表明,城镇生活污水和农业面源污染输入的氮、磷以及有机物,对巢湖富营养化起着重要的作用。

Study on the influential factors of the water quality in Chaohu Lake based on principal component analysis

The influential factors of the water quality in Chaohu Lake and their mutual relationships are analyzed by principal component analysis and Matlab software based on the data from 1987 to 2003. The results from the correlation ananlysis show that TP relates with TN, and COD__(Cr) relates with TP and TN, and the biomass of the phytoplankton relates with Chl-a and TN. SD presents high negative association with TP, TN and COD__(Cr). The results from principal component analysis show that TP,TN,COD__(Cr),SD,Chl-a and the biomass of the phytoplankton are main factors. Phosphorus is the most influential factor of eutrophication in Chaohu Lake, and TP, TN, COD__(Cr) and the biomass of the phytoplankton can contribute to the transparency of the water quality. The results show that nitrogen, phosphorus and organic matter from the urban sewerage and the agricultural non-point source pollution play an important role in Chaohu Lake eutrophication.