主成分分析法评价多级生物系统对集约化池塘修复效果研究

应用由刷状弹性生物填料、浮床植物空心菜和沉水植物蓖齿眼子菜组成的多级生物系统对集约化池塘进行修复，采用主成分分析法对修复效果进行评价，结果表明，多级生物系统使得集约化池塘主成分综合得分显著降低、水质综合状况明显改善；具体分析还表明，决定实验条件下集约化池塘富营养化的主要营养因子是氮素，水体耗氧水平主要由有机成分决定。应用主成分分析法综合评价外在技术手段对池塘水体的净化效果可行。

Effect of Restoration on Intensive Ponds by Multilevel Bio-system with the Method of Principal Component Analysis

The multilevel bio-system which was composed of three parts,suspension of the immobilized biofilm structure of the artificial substrates,cultivation of the floating-bed-vegation and submerged macrophyte,was used to restore the intensive ponds.And the method of principal component analysis （PCA） was used to assess the restoration effect.The results showed that the using of the multilevel bio-system made the integrated scores of principal components drop to a low level,which meant that after the technology referred above being used,the comprehensive status of the water quality of intensive ponds got better.The further analysis with PCA also showed that the main nutrition factor making the ponds eutrophication was the N element,and the organic ingredients were the key factor of oxygen consumption.To sum up,the method of PCA can be used to assess the restoration effect of external purifying technology.