滴灌带布设方式对棉田土壤盐分运移规律的影响研究

Effect of Drip Irrigation Tape Disposition Pattern on Soil Salinity Migration in Cotton Fields

为探究1膜1管4行和1膜2管4行对滴灌棉田土壤水盐运移规律的影响,进行了滴灌棉田田间取土测定含水率和含盐量的实验。研究表明:在16次、12次这2种灌水频次、4种灌溉定额(6 000、5 250、4 500、3 750m3/hm2)和2种滴灌带布设方式(1膜1管4行和1膜2管4行)的16种组合下,1膜1管4行在滴管带下方有一个淡化区,1膜2管4行在滴管带下方有2个淡化区,淡化区成椭球形。通过对2种滴管带的布设方式的积盐区位置的分析发现:1膜2管4行更有益于棉花生长,灌溉水利用系数1膜2管4行较1膜1管4行高,减少了灌水时间,提高了灌水效率,减少了深层渗漏水量。

In order to explore the different effects of the one film-one tape-four lines and one film-two tape-four lines on the movements of water and salt in the soil of the drip irrigated cotton field,the experiments aiming to determination levels of soil moisture and salinity were set up in the field.The results showed that with the mix of two irrigation frequencies（16 times and 12 times）,four irrigation quotas（6 000,5 250,4 500,3 750 m3/hm2） and two capillary disposition pattern（a film-a tape-four lines and a film-two tape-four lines） into sixteen combinations,the former disposition pattern had one dilute zone below the drip capillary.In contrast,the other had two dilute zones,which was ellipsoid.Through an analysis of the salt accumulation zones of these two patterns,it could be found that the second scenario was more conducive to the growth of cotton,and had a higher efficiency in the use of irrigation water,which also reduced the irrigation time,improved irrigation efficiency and reduced leakage into the deep layer.