Study On Environment Control Of Pistia Stratiotes

In recent years,Pistia stratiotes outbreak in Jinping County river water basin,accumulation zone,part of the waters because of Pistia stratiotes rapidly growing,resulting in a large number of fish hypoxia suffocation,and even part of the journey is the impassable,bring many problems to environmental and social problems to the local people.The application of geography,biology,statistics and other related disciplines,principle and technical means,take the field observation method,quantitative experimental analysis,through the selection of Pistia stratiotes are scattered and spread,affected three typical section,different growth zone three years of water environment were analyzed,combined with the growth forecast of field observation statistical unit time trend,growth analysis results from the occurrence of Pistia stratiotes,systematic research on the characteristics of growth,explore prevention and control methods.The results showed that Pistia stratiotes:(1)The temperature of Pistia stratiotes large-scale outbreak of temperature 25~33?,water temperature 14~24?.(2)The critical concentration of Pistia stratiotes breeding is N 100mg/L,P 50mg/L and K 150mg/L.Above this concentration,the growth was inhibited,promote growth below this concentration,and the critical concentration of N,P and K was 3:3:5.The best nitrogen,phosphorus and potassium concentrations is 100?100?50~100mg/L,the best ratio of nitrogen,phosphorus and potassium is 2:2:1~2.The ratio of nitrogen to phosphorus is higher than 1,P and K ratio is higher than 3:5,Pistia stratiotes begin to multiply.According to the research results,establish early warning mechanism for the prevention and control of river basin Pistia stratiotes local government,provide the basis and reference data for the monitoring and control of different Pistia stratiotes in eutrophic water.