A Mechanism Study On Underground Water Pollution From Paddy Field Happened In Lower Position Of Liao River Plain

One reason of under-ground water being contaminated is agricultural non-pointpollution.The research object in this article is the unsaturated zone soil layer in the6typical rice paddies in lower altitude of Liao river Plain. On the basis of informationcollection, investigation research on site, sample collection and test analysis, thekinetics of ammonia and Phosphorus Adsorption-Desorptionin soil are analyzed under the same indoor condition, the theory of under-ground waterpollution caused by rice paddy is primarily discussed, which provides reliable Scientificevidence to the prevention and management of the pollution.The conclusion indicated: according to the simulation of Phosphorus in soilabsorption kinetics, it is found that there are many kinds of Phosphorus in soilabsorption systems on lower altitude of Liao Plain; The dynamic curve indicates that thePhosphorus absorption speed is higher in the first6hours, after that the speed falls downto be stable. Phosphorus desorption will be stable in2h. Simulation the value ofphosphorus. The kinetics of ammonia Adsorption-desorption in soil respective simulatedby ExpAssoc model and Asymptoticl model which are comparatively better.Absorb-curve indicates that it lasts about15min when the absorption ammonia valuereaches to90%balance, and desorption process speed is18times slower than absorbprocess speed, the time is about3-5h..Applying the theory of ammonia Phosphorusabsorption-desorption to under ground water pollution in Liao river Plain, the theoryvalue indicates that after fertilizing, under ideal conditions, the maximum ammonia loserate in the rice paddy is between0～14.26%, and the Phosphorus maximum lose rate isbetween0～9.81%.Under the conditions of irrigation and continuous rain and storm, thevalues are2.565～6.264%and1.598～2.862%respectively.