Nutrient Distribution And Pollution Prediction Research In Water Of Ulansuhai

Lake eutrophication has become a universal concern in the world today. The research on nitrogen and pH was regarded very important during renewing and controlling eu-trophication of lakes. Based on the Ulansuhai as the research object, from the monitoring and evaluation, mechanism and prediction of four aspects of a systematic analysis of eutrophication of Ulansuhai research, eutrophication provide theoretical basis for the prediction and control. In this paper, main conclusions are as follows:1)The SD in the lowest in the summer, chlorophyll-a concentration to the maximum in the summer, Nutrient elements maximum total nitrogen, total concentration in the spring. Show that, the enrichment of nutrient salt in the spring a lot of Ulansuhai, cause the total nitrogen, total concentration reaches maximum value, algae blooms in summer. Which reduces the water transparency, causing water quality deterioration, accelerate the process of eutrophication.2) Dissolved oxygen, water temperature, pH value directly influence on the concentration of chlorophyll-a, and total nitrogen, total pH nutrition elements on the influence of chlorophyll-a lag, of total pH in spring and summer chlorophyll-a show significant correlation, total nitrogen in spring and summer the chlorophyll-a and total pH in summer and autumn chlorophyll-a show significant correlation.3)Using spring from2008to2011in total nitrogen, total pH in spring and chlorophyll-a in summer applies to Ulansuhai chlorophyll-a concentration prediction model is set up, Spring and spring from2012to2013in total nitrogen, total pH and chlorophyll-a summer measured data to verify this model, Finally be chlorophyll-a concentration prediction modellg(叶绿素a)=0.5986lg(总磷)+1.4580lg(叶绿素a)=0.3626lg(总氮)+0.99444) Using principal component analysis to pollution mechanism is analyzed, five main seawater quality control of components. Water quality is mainly influenced by the first principal component, total nitrogen, total pH and chlorophyll-a and the influence of transparency, the main characteristic indexes for eutrophication; Followed by the second principal component, salinity, conductivity and total soluble solids(TDS),mainly for the characteristics of the saline lakes pollution index; The third principal component-the depth of the water and sediment deep, mainly for the lakes characteristic indexes in the physical form;4under the control of the water pH characteristics, finally aquatic organisms growing environment index, the content of dissolved oxygen in lake water quality control index. When the lake water pollution situation assessment, the need to water the chemical, physical, biological, each link of the form factors into account, in lake pollution mechanism on the basis of the study, can be more comprehensive to analyze the status of lake water environment pollution.5) Based on the data of Ulansuhai in2013, TN average of2.31mg/L, TP average of0.26mg/L, in lake water quality standard project in V class above; The average salinity of2.29, which indicates that high degree of water quality of lakes; Mud lake average water depth of2.78m, and the average thickness of0.36m, about water depth about1/6of the thick mud, lake swamping phenomenon is more serious.6) Eutrophication evaluation analysis in the whole lake eutrophication and eutrophication status in existence, and from north to south in the lake district, occurs in the nutrition and gradually reduce the frequency of eutrophication; Exist in each time period and eutrophication status of the frequency highest month for each year in September. Ulansuhai overall in recent years is still a moderate to eutrophication of lakes.