Resarch On Effect Of Systerm Temperature To Water And Nitrogen Distribution Under Water Storage Pit Irrigation

Soil temperature not only has an important influence,on soil water movement, but also is the main factor of soil nitrogen mineralization. In this paper, Under the condition of water storage pit irrigation, The environment temperature, soil temperature, water temperature is set to the same.To study the effects of system temperature on water movement and nitrogen distributionUsing indoor soil box simulation experiment,5levels are set up(5、10、20、25、35) to study the effects of system temperature on water movement and nitrogen distribution.The main results are as follows:1.The moist body stretches outward in the form of pear shaped. The radial advances significantly in the initial stage, the vertical become significant with the passage of time. The radial and vertical maximum moving distance increase with time, and finally tend to be stable. And in the same time radial maximum propulsive distance is greater than the vertical. At the same time, the wetting peak, maximum radial and vertical have little difference.2. Radial conditions, under different system temperature, the surface and bottom soil moisture is low. the soil moisture increase first and then decrease with the increase of depth. Vertical condition, the soil moisture decrease with the increase of radial distance. system temperature has little effect on soil moisture spatial distribution.3. Ammonium nitrogen in the radial and vertical distribution changes with time, the longer the time, thet lower ammonium nitrogen when it is20,25and35,25degrees were more obvious. The other two temperature, ammonium nitrogen changes with time is not obvious.under different temperature, the longer the radial distance, the less the corresponding vertical total amount. Ten days after irrigation, Ten days after irrigation, r=24cm,5-25range, the higher the temperature is, the lower the content of ammonium nitrogen, Two vertical condition, ammonium nitrogen decrease with the increase of temperature when in the range of5to25.4. Nitrate nitrogen in the radial and vertical distribution does not change with time obviously, the longer the radial distance,the more the corresponding amount when it is5,10. the longer the time, the higher nitrate nitrogen when it is20,25and35,25degree was higher. When z=27cm and z=47,67cm, the corresponding radial nitrate nitrogen increase first and then decrease repectively in the tenth day and the tenth、fifth days. The surface and bottom nitrate nitrogen is high. Ten days after irrigation, the nitrate nitrogen reach the most in the radial and vertical direction when it is25. The surface nitrate nitrogen reach the highest when it is35.