The Algae Classification And The Biological Characteristics Of Preponderant Algae In Xinlicheng Reserve

Eutrophication has become a global environmental problem and causes universal attention.With the rapid speed development of economy and society,eutrophication is more and more severity.China's major freshwater lakes(reservoirs) and urban lakes generally poor water qudlity,more than 75 percent of the rake eutrophication intensified that affect water qudlity and function and hinder the normal development of socio-economic.Therefore,clearly water algae biological characteristics of different lakes and reservoirs, such as species composition,the optimum temperature of the dominant species,light and N/P,to the forecast eutrophication and the formation of potentially hazardous(toxic algae) and against Study of the antieutrophication, control measures have great significance.This study on the algae species composition were classified research in the Xinlicheng Reservoir. Besides,this study investigated the existing reservoir algae,seasonal changes and the influence of summer reservoir in net training system,such as temperature,light and N/P.In order to provide management of drinking water source with reference data,such as develope economic reasonable,practical prevention measures.Reach the following conclusion.(1) The survey results showed that the all phytoplankton includ 5 phylums and 15 orders,28 families, 57 genus,in Xinlicheng Reservoir.Among them,Cyanophyta includ Chroococales,Osillatoriales and Nostocales,including Synechococcaceae,Merismopediaceae and other six Families,including Rhabdogloea, Aphanocapsa and other nine genus,including Microcystis aeruginosa,Spirulina major and other twelve Species.Chorophyta includ Volvocales,Chlorococcales and other three orders,including Chlamydomondaceae,Volvocaceae and other eight Families,including Chlorella,Chlorella and other twenty seven genus,including Treabaria triappendiculata,Tetraedron minimum and other forty six Species. Bacillariophyta includ Coscinodiscales,Araphidiales and other three orders,including Coscinodiscaceae, Fragilariaceae and other thirteen Families,including Melosira varians,Fragilaria brevistriata and other twenty four genus,including Treabaria triappendiculata,Tetraedron minimum and other forty six Species and variations.Euglenophyta include Euglenales one order,Peranemaceae one Family,Peranema one genus, Peranema deflexum one Specie.Xanthophyta include Mischococcales one order,Gloeobotrydaceae one Family,Gloeobotrydaceae one genus,Gloeobotrys limneticus one Specie.The Phytoplankton consisted of 16%Cyanophyta,53%Chorophyta,29%Bacillariophyta,1%Euglenophyta,1%Xanthophyta.In all of these,a total of 90 kinds of varieties and variations.(2) From Xinlicheng Reservoir algae cell density of the community on spring,summer and autumn, summer maximum,with an average of 9.33×103cells/mL;autumn Secondly,with an average of 4.76×10~3 cells/mL;at least spring,with the average is 1.05×10~3 cells/mL.This change may be due to environmental factors caused by the seasonal changes.Different seasons,the water temperature,light,dissolved oxygen, nutrients drip equality are differences,and different types of environmental conditions there are differences adapt to the situation,thus causing seasonal changes in the distribution of algae.(3) The preponderant species of algae showed obvious changes of season in Xinlicheng Reservoir:spring for Scenedesmus,Synedra,Melosira,the volume accounted for 19%of the total number of species,23%,18%. Summer mainly Microcystis.The number of 65 per cent of the total number of species.Fall for Scenedesmus, microcystin,the volume accounted for 24%of the total number of species,30 percent.Microcystis aeruginosa in Microcystis is the advantage of the summer species.(4) Microcystis aeruginosa is a common drug producing harmful algae,breeding faster in water.The results show that:by the cell density of waterbioom-forming-Microcystis aeruginosa in different temperature conditions(20℃,24℃,28℃,32℃) culture experiment,We can know that Within the scope of the trial, Microcystis aeruginosa as the temperature increased cell density increased,but the high temperature and inhibit its growth.Growth in the 28℃at best and cell density reached the maximum.By the preponderant species of waterbioom-forming-Microcystis aeruginosa in different illumination conditions(2000 1x,2500 1x,3000 1x,3500 1x,4000 1x) culture experiment,We can know that Within the scope of the trial,Microcystis aeruginosa as the illumination increased as cell density increased,but the high illumination and inhibit its growth.Growth in the 30001x at best and cell density reached the maximum.Within the scope of the trial,15:1 Microcystis aeruginosa growth is a better ratio of nitrogen and phosphorus.When the TN/TP was 20,the former six days breeding Microcystis aeruginosa fastest.When the TN/TP 15:1,Microcystis aeruginosa cells reached a peak of the shortest,and the cell density is greatest.When the TN/TP for 5:1,the slowest growth of Microcystis aeruginosa,did not change significantly,the concentration was also low,the peak period did not appear In observation.