Water Quality Analysis And Irrigation Expermental Study Watershed Nitrogen And Phosphorus Emissions In Upstream Of Lijiang River

Based on the analysis in upstream of the Lijiang hydrometeorological,river ecology,hydrology geology condition,based on factors such as land use,combined with the Lijiang basin upstream water quality monitoring section of monitoring data,a preliminary analysis in upstream of the Lijiang basin emissions of pollutants.In upstream of Lijiang basin to select a representative agricultural irrigation area—Qingshitan Xiganqu Jingui River experiment area,continuous monitoring experiment was carried out,and through Jingui River experiment area in situ continuous monitoring,collection and monitoring water experiment analysis,get the water quality index data,then analysis Jingui River experiment area variation characteristics of main form of nitrogen and phosphorus pollution.The main research contents and results are as follows:?1?In 2006²015,the Qingshitan reservoir dam foundation COD_Mn average concentration for?class,change of within the year and interannual fluctuation is bigger,the pollutant concentration showed a trend of rising.Damian hydrological station and Guilin hydrological station COD_Mn average concentration for?class,interannual fluctuation is small.In 2006²015,the change of the ammonia nitrogen in three monitoring section year fluctuations than the interannual changes dramatically.In 2006²015,the total phosphorus concentration fluctuation changes from big to small in the order:Guilin hydrological station>Qingshitan reservoir dam foundation>Damian hydrological station.?2?Of three monitoring section monitoring:NH3–N,TP,COD_Mn,pH,DO these five correlation analysis of indicators of water quality,results showed that the water quality index correlation coefficient of average order from large to small is:NH3-N—TP>CODMn—TP>CODMn—NH3-N>CODMn—pH>DO and other water quality index>pH and other water quality index.From 2006 to 2015,in all water quality indexes,NH3-N and TP keep high correlation,long-time average annual value is 0.6.?3?By the upstream of Lijiang river basin export water impact on water quality analysis:for the upstream of Lijiang basin,according to the general characteristics of comprehensive pollution index is:mutagenicity>level period>altogether.As a result of the river water is relatively large,so obvious corresponding relation between water quantity and water quality.?4?By means of 5¹2,2016 Jingui River experiment area temporal variation characteristics of nitrogen and phosphorus in the study found that:sub basin?1?the average concentration of nitrogen and phosphorus in four sub basin is the smallest,water quality is best.Sub basin?2?,Sub basin?7?,Sub basin?8?affected by nitrogen and phosphorus pollutants in the basin itself,nitrogen and phosphorus concentration change vary.Jingui River experiment area trunk stream of nitrogen and phosphorus concentration on the time scale of the monitoring had no obvious change trend,and along the overall trend is rising,in the main canal irrigation period of nitrogen and phosphorus concentrations are relatively low,but affected by agricultural activities try extent of the concentration of nitrogen and phosphorus in the area is not big.?5?By means of 5¹2,2016 species of river test load and the concentration changes of nitrogen and phosphorus emissions in the area of study:Sub basin?1?nitrogen and phosphorus emissions more load value,the greater the emissions;Sub basin?2?the nitrogen and phosphorus emissions negative influenced by upstre am watershed export fish ponds;Sub basin?7?how much nitrogen and phosphorus discharge load in all landowners and precipitation,as well as in the basin is directly related to the land use ways;Sub basin?8?was nitrogen and phosphorus emissions of the load variation characteristics at present is not clear.Basin export monitoring during the period of nitrogen and phosphorus emissions and concentration of nitrogen and phosphorus load wave have the same change trend.