论文部分内容阅读
采用微孔渗灌管,在埋深为35cm的条件下进行了田间试验。处理设40cm、60cm和80cm3种间距,对比了人工阻水层的效果,并对控制性分根区交替渗灌进行了初步探讨。结果表明,渗灌管深埋灌溉造成的深层渗漏量比较多,设人工阻水层能够提高灌溉水的利用效率;渗管间距在60cm时灌溉水的利用率最高;分根区交替渗灌对渗灌管深埋条件下的土壤水分剖面的影响不明显;渗管深埋时田间实际渗水速率与试验室内测定的渗水速率很接近,且随压力水头的增加呈幂函数增加。
Microporous irrigation pipes were used to conduct field experiments under the conditions of buried depth of 35cm. Set up 40cm, 60cm and 80cm3 kinds of spacing, compared the effect of artificial water blocking layer, and the control of the root zone of alternate infiltration were discussed. The results showed that deep seepage irrigation resulted in deep seepage leakage, artificial water-blocking layer could improve the utilization efficiency of irrigation water; the irrigation water utilization rate was the highest when the spacing of seepage pipe was 60cm; The effect of seepage irrigation on the soil moisture profile under the condition of deep buried irrigation is not obvious. The actual water seepage rate in the field when the seepage pipe buried deeply is close to that measured in the laboratory, and increases exponentially with the increase of the pressure head.