The transfer and distribution characters of soil moisture and nitrate nitrogen of intermittent infiltration

摘要

The circle ratio r has a significant impact on the development of sealing layer, which reduces the intake rate and increases the flow advance. In this experiment, a simulated indoor environment, a vertical one-dimension intermittent fertilizer infiltration, with 70cm of groundwater table, was set up. The influences of circle ratio on the infiltration reduction, the transfer and distribution character of moisture and nitrate nitrogen in the soil and the distribution of nitrate nitrogen in the groundwater were studied. The results indicate that with the same water supply, the smaller the circle ratio is, the better the water sealing layer develops, and the stronger the infiltration reduction is. Meanwhile the moisture and nitrate nitrogen would distribute in shallower soil layer, therefore the leaching of nitrate nitrogen weakens.