The Research Of The Transition And Transform Characteristics Of Agricultural Non-point Source Pollutants N、P In The Sediment Of The Lake And Reservoir

The widespread using of chemical fertilizers, making a large number of nitrogenfertil-izers、phosphorus fertilizer and agricultural high nitrogen、phosphorus sediment intothe lake and reservoir in the form of non-point source. Non-point source pollution has becomean import-ant source of pollution in aquatic ecosystems, nitrogen and phosphorus are majorpollutants, that causing aquatic ecological pollution. Sediment is an important part of thewhole lake ecological system, it is the remit of contaminations and a source of contamination.Sediment is the main home of lake and reservoir nutrients, the sediment nutrients would bemoved into the water again by the influence of diageneses.Through the analysis,adsorption and desorption kinetics researches of different forms ofnitro-gen and phosphorus in the Xinlicheng Reservoir sediments、eutrophication of lake sedimentsand surrounding soil of the Xinlicheng Reservoir, as well as the impact of different factors onnitrogen and phosphorus adsorption and resolve quantitative research, could systematicexhibit the relationship of nitrogen、phosphorus and sediment, and has a importantimplications to study the aquatic ecosystems of lake and reservoir.With the improving continuous grading extraction to classification of nitrogen, thehighest content of Acid Hydrolysis Nitrogen （HN） samples, Exchangeable Nitrogen （EN）and Residual nitrogen （RN） contents are relatively close, Free Nitrogen （FN） content isthe lowest;RN respectively of the total nitrogen content for40.72%、25.36%and38.32%, Thestability of the description of nitrogen in the sample as follows: sediment C> soil A>sediment B. On phosphorus is classified, the sediment of A closed state storage aluminumphosphorus content is the highest, effective phosphorus content for sediment B> soil C>sediment A, ineffective phosphorus content for sediment A> sediment B> soil C.Samples of nitrogen adsorption, analytical features are basically consistent. Adsorptionand desorption Processes conform to the secondary reaction kinetics equation, the correlationcoefficient R2are correlation tested, the correlation coefficient are extremely significantdifference level. With the increasing of temperature, three kinds of selected samples ofnitrogen adsorption capacity and adsorption rate decreased, the adsorbing capacity of35℃is62.56%~75.17%in15℃, whiledesorption capacity are increased, the desorption capacity of35℃is higher than15℃of25.23%~32.09%. With the increasing of pH, three kinds of selectedsamples of nitrogen equilibrium adsorption quantity increases,when the solution pH is10,adsorption of sediment A, sediment B and soil C, respectively were434.054,250.917and 250.917μg/g, desorption capacity decreases with the increasing of pH, equilibrium desorptioncapacity reaches the maximum when pH is4, respectively are88.82,130.89, and189.54ug/g,the increase of the concentration of COD, three kinds of selected samples of nitrogen balanceadsorption capacity are reduced, COD values within0~50mg/L, the tendency decreasedsignificantly; equilibrium desorption capacity as COD concentration to increase the gentlerose slightly. And decreased with the increase of nitrogen content in active form,, sediment Aand soil C equilibrium adsorption capacity of nitrogen are basically consistent, respectivelyare375.89ug/g and364.97ug/g, sediment B equilibrium adsorption capacity is small, only156.29ug/g, consistent with the Langmuir adsorption isotherm adsorption process.Samples of phosphorus adsorption and desorption characteristics are basically consistent,phosp-horus adsorption capacity and adsorption rate decreased with its active forms ofnitrogen and available phosphorus content increased. Adsorption equilibrium adsorptionamount of phosphorus of sediment A, sediment B and soil C sediment phosphorus are86.39,44.95and51.37μg/g. The adsorption process according to the Langmuir isothermalequation of adsorption. with the increasing of temperature, the amount of phosphorusadsorption capacity and desorption capacity increase; the maximum amount of phosphorusadsorption occurs pH are6to7, sediment A could be up to91.85ug/g, the maximumdesorption occurs around pH=6, Sediment A could be up to54.31ug/g; when COD value is50mg/L, the amount of phosphorus adsorption capaci-ty and desorption capacity aremaximum; though three under the condition of different factors for the adsorption capacityand desorption capacity of nitrogen, phosphorus test sample compar-eson, pH changes impacton the soil is higher than others.