循环率对一维间歇入渗土壤水、氮运移分布影响的室内试验

循环率r的大小直接影响间歇入渗土壤致密层的发育程度，进而影响其减小土壤入渗率和田面糙率的作用。该文在室内模拟了地下水位为70.00 cm的非饱和土壤、灌施条件下的垂直一维间歇入渗过程，重点研究了循环率对肥液(KNO₃溶液)间歇入渗的减渗性和土壤中入渗水、硝态氮的运移分布特性。结果表明，减小循环率可使肥液间歇入渗表土致密层发育更加成熟，减渗作用明显增强，同时入渗水分、硝态氮分布于更浅层土壤中，减弱土壤硝态氮的淋失趋势。

Experimental studies on the effects of circulation rate on transfer and distribution of soil moisture and nitrate nitrogen of intermittent infiltration

The circulation rate directly affects the development of the water sealing layer, therefore weakens the infiltration reduction and the increase of advancing velocity of furrow flow under periodic water-supply. Under a simulated indoor environment, a vertical one-dimension intermittent fertilizer infiltration at 70 cm of underground water level, was set up. In the experiment, the influences of circulation rate on the infiltration reduction, the transfer and distribution characteristics of moisture and nitrate nitrogen in the soil were studied. The results indicate that with the same water supply, the smaller the circulation rate 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 trend of nitrate nitrogen weakens.