Study On Planktonic Algae And Evaluation Of Water Quality In Fenhe River Of Taiyuan

This paper studied on the planktonic algae of Fenhe River of Taiyuan from May 2009 to Dec.2009, has 6 samplings, they are Shanglan Bridge, Fenhe Iron Bridge, Shengli Bridge,Yingze Bridge, Nanneihuan Bridge and Xiaodian Bridge. Monitored and researched the planktonic algae community composition and seasonal variation in Fenhe River of Taiyuan by planktonic algae species composition, biomass, dominant species, Shannon-Wiener Diversity Index, Margalef Diversity Index and Pielou Evenness Index. At the same time, physical and chemical indicators were monitored, including water temperature, conductivity, flow rate, chemical oxygen demand, total hardness, total phosphorus, ammonia nitrogen, dissolved oxygen, pH, Cd, Cr, Zn and Pb. This article provides aquatic biological information in Fenhe River of Taiyuan, and evaluate the water quality comprehensively by combining with biological, physical and chemical indicators. A theoretical basis is provided for water quality monitoring, evaluation and comprehensive management in the future.There are 224 planktonic algae species in Fenhe River of Taiyuan, which belonged to 89 genus 8 phyla. The planktonic algae species of Cyanophyta are 23 genus 103 species, accounting for 46% of the total number of planktonic algae species; Chlorophyta are 37 genus 75 species, accounting for 34%; Bacillariophyta are 19 genus 36 species, accounting for 16%; the species of other phyla are few. Planktonic algae biomass of Cyanophyta is the most. Monthly average number of Cyanophyta, Chlorophyta and Bacillariophyta is 29776.8×104 cell/L,890.71×104 cell/L and 868.69×104 cell/L respectively, the number of the other phyla is low. The average number of planktonic algae in Sep. was the highest, which is 115070.60×104 cell/L, and the number is lower in Jun. for 20028.00×104 cell/L. There are 15 dominant species, they are Phormidium tenue, Merismopedia glance, Aphanocapsa elachista, Phormidium faveolarum, Oscillatoria amphibian, Planktothrix sp., Planktothrix sp., Lyngbya contarta, Oscillatoria tenuis, Spirulina major, Chlorella vulgari and Synedra. Acus. The range of Shannon-Wiener Diversity Index, Margalef Diversity Index and Pielou Diversity Indices is 0.38 -2.48,0.30 -0.25 and 0.25 -2.48 respectively.Based on the correlation analysis of planktonic algae biomass and the physical and chemical indicators, the results shows that biomass and nitrogen were significantly related in Mar.2009, conductivity associated with the biomass most in Jun.; in Sep. the dissolved oxygen level was significantly related to biomass; in Dec. total hardness associated with the biomass most. The six samplings are divided into three groups by PCA cluster of physical and chemical indicators. The first group is Shanglan Bridge and Fenhe Iron Bridge; the seconed group is Shengli Bridge, Yingze Bridge and Nanneihuan Bridge; the third group is Xiaodian Bridge.