硅藻指数在龙江与刁江流域生态健康评价中的应用

应用硅藻指数来评价龙江与刁江的水生态健康状况,分别在龙江和刁江流域设置16个样点进行调查研究.鉴定结果表明:龙江流域鉴定出硅藻28属121种,刁江流域鉴定出硅藻23属114种,共同优势属为舟形藻属、曲壳藻属、菱形藻属、桥弯藻属、异极藻属.对目前较成熟的16项硅藻指数,通过因子分析、聚类分析、箱型图分析等多种统计分析方法...

Application of Diatom Index in Ecological Health Evaluation of Longjiang and Diaojiang River Basin

The diatom index is used to evaluate the water ecological health of Longjiang and Diaojiang,and 16 sample points are set up in the Longjiang and Diaojiang basins for investigation and research.The identification results show that 30 genera and 141 species of diatoms are identified in the Longjiang River Basin,and 138 species of diatoms in 24 genera are identified in the Diaojiang River Basin.The common dominant genera are Navicula,Trichothecium,Nitzschia,Hydracea Heterophaga.For the currently more mature sixteen diatom indexes,the applicability of the diatom indexes is studied through factor analysis,cluster analysis,box diagram analysis and other statistical analysis methods.The results show that most of the diatom indexes are significantly correlated with TP,TN,Cond,pH and extremely significantly correlated with V,and only the WAT index is significantly correlated with NO3-N.Three indexes of IPS,IDG and CEE are selected as reference biological indicators for water quality evaluation in this area.Through a comprehensive judgment of the diatom index,it is concluded that the Longjiang samples are of good and medium water quality,a small part of the Diaojiang samples are of good grade water quality,73%of the samples are of medium or poor water quality,and the overall water quality of Longjiang is better than that of Diaojiang.