坐水播种时耕层土壤水分再分布的数值分析

Analysis of Soil Moisture Redistribution in Farmland under Bed-Irrigating Sowing

利用朝阳县的旱地土壤取得基本参数后,应用数学模型计算了坐水播种时耕层土壤水分再分布时的土壤湿润状况参数,通过数值分析揭示了坐水播种湿润锋运动和土壤含水率的变化规律。结果显示:湿润锋运动速度和土壤含水率的变化速度都是由快逐渐减慢,所形成的湿润区近似一个球冠体;土壤含水率中的最大值出现在沟底附近;并提出可以用历时7 d的土壤湿润状况参数作为衡量坐水播种灌水质量的指标。

After obtained the basic parameter from the arid land of Chaoyang county, the mathematics model of soil moisture redistribution under bedirrigation sowing was developed, soil moist condition parameters were computed, and the moisture front movement and the soil moisture content change rule was promulgated through the numerical analysis. The results showed the moisture front movement speed and the soll moisture content variation rate all was gradually reduced and one approximate ball-crown body moisture area was formed. The maximum value of the soil moisture content appeared in the neighborhood of the ditch sole. And the use of 7 day-long soils moisture condition parameter to appraise irrigation quality was proposed.