渗管深埋条件下日光温室渗灌技术初步研究

Preliminary Research on Infiltration Irrigation Technique for Sunlight Greenhouse under Condition of Deep Embedded Infiltration Pipes

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。

For the infiltration irrigation pipes with pores, they have been tested in field under embedded depth of 35 cm. For the three pipe-internals of 40 cm, 60 cm and 80 cm, the effects of artificial water-resistant layer are compared each other. Meanwhile, the controlled roots-divided alterna-tive infiltration irrigation is discussed preliminarily. The results show that the deep embedded infiltration irrigation pipes cause more seepage, loss in the deep layer; setting up an artificial water-resistant layer can raise the utilization efficiency of irrigation water; when the pipe-interval of 60 cm, the utilization efficiency of irrigation water reached highest; the influence of the roots-divided alternative infiltration irrigaiton upon the soil section mois-ture distribution under the condition of deep embedded infiltration irrigation pipes, is not obvious; under the condition of deep embedded infiltration pipes, the field actual infiltration water velocity quite meets the velocity measured in the laboratory; and it increases with a power function following the increasing of pressure head.