Water Quality Assessment Of Fu River Based On Periphyton

As one of the most important water supply river of Baiyangdian,the water quality of Fu River has a direct impact on Baiyangdian,so the master and monitor to Fu River play an important role for the protection and management of Baiyangdian.To understand the water quality and variation of periphyton community structure in Fu River,the survey was carried out in spring,summer and autumn in 2016.From upstream to downstream river,the research set up 11 sampling sites.Monitoring water temperature(T),dissolved oxygen(DO),pH value,ammonia nitrogen(NH4+-N),total phosphorus(TP)and total nitrogen(TN)of the temporal and spatial variation,using artificial substrate slides to collect the periphyton samples,determined and identified on the species of periphyton and organic matter,chlorophyll a and maximum photosynthetic the rate of Fv/Fm.Using Pearson correlation analysis to understand the correlation between periphyton and environmental factors,using water physicochemical indexes and periphyton biological indicators to evaluate the Fu River,provide an important reference for the water quality control and monitoring management and protection in Baiyangdian.In 2016 Fu River,147 periphyton species that belonged to 6 phyla were identified,there were 65 species of Bacillariophyta,accounting for 44.22%;43 species of Chlorophyta,accounting for 29.25%;23 species of Cyanophyta,accounting for 15.65%;6 species of Pyrrophyta,accounting for 4.08%;6 species of Euglenophyta,accounting for 4.08%;4 species of Cryptophyta,accounting for 2.72%.The composition of periphyton community was the largest in summer(105 species)and the lowest in autumn(86 species)in the temporal distribution,Baiyangdian(87 species)was the largest and East Lake(70 species)was the lowest in the spatial distribution.The abundance of periphyton communities in spring and summer was significantly higher than that in autumn,except for individual sample point,spring is generally higher than that in summer;in the spatial distribution the Huanghua Ditch-Fu River intersection was the highest,6.14×108ind./m2,Dongfeng Park was the lowest,3.33×108ind./m2.In Fu River,the Shannon-Wiener diversity index ranged from 2.664 to 3.428,the Margalef index ranged from 2.173 to 7.747,the Pielou evenness index ranged from 0.292~0.554.The Shannon-Wiener index and Margalef index in the time distribution were all summer > spring > autumn.The value of Pielou index was highest in autumn,summer was higher than spring.The Shannon-Wiener index and Margalef index were the lowest in Jinsha River-Fu River intersection and the largest in Baiyangdian in the spatial distribution.the Pielou index was the lowest in East Lake and largest in Baiyangdian.Correlation analysis of periphyton and physicochemical factors showed that in different time,physical and chemical factors on periphyton communities is different.Ammonia nitrogen and total nitrogen could promote the content of organic matter accumulation of periphyton,the TN/TP helps to increased the total periphyton chlorophyll a content,T is conducive to increase chlorophyll a content of blue and green algae.Therefore,ammonia nitrogen,total nitrogen,TN/TP and T were the key factors affecting the growth and reproduction of the periphyton community.We used water physicochemical indexes,biodiversity index(Shannon Wiener index,Margalef index and Pielou evenness index)and periphyton photosynthetic to evaluate the water quality of Fu River.The results are basically the same that river is in general eutrophication,eutrophication trend obviously.The water quality of Fu River from good to bad is summer > autumn > spring,the upper reaches of the river is seriously polluted,but the water quality of North Lake is very good,from the middle of the natural river Jinsha River-Fu River intersection until the downstream gradually improved,then into the river water quality in Baiyangdian is good.The innovation of this study is using the proportion of silicon dinoflagellate in total chlorophyll to evaluate water quality,based on the correlation between the water quality and the physical,intimidation affected by nutrient.Using PHYTO-PAM to evaluate the water quality.The results are consistent with the evaluation results of physical and chemical factors and periphyton,the test method is effective and the test procedure is simple and convenient.