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通过土柱模拟试验,从不同滴头流量、滴水定额和滴灌水质三个方面,研究了不同滴头流量条件下水分运移规律以及不同滴头流量、水质对棉花蒸散特性的影响。研究表明,相同滴水定额条件下,大滴头流量有利于水分的水平运移,湿润锋曲线呈椭圆型,小滴头流量利于水分的垂直下渗,湿润锋更接近于圆形;苗期(6月份)和吐絮期(10月份)0.3 L h-1滴头流量处理蒸散量小于0.8 L h-1,只为后者的78.3%,而在7～9月份,小滴头流量滴灌蒸散量则明显大于大滴头流量。微咸水滴灌条件下,2.47 g L-1微咸水灌溉对蒸散量没有影响,3.50 g L-1咸水灌溉则有明显的抑制作用,整个生育期内咸水灌溉棉花蒸散总额比淡水和微咸水灌溉减少8.0%。
Through the soil column simulation test, the effects of water transfer under different dripper flow rates and the effect of different dripper flow and water quality on the transpiration characteristics of cotton were studied from three aspects of different dripper flow rate, drip irrigation quota and drip irrigation water quality. The results show that under the same drip condition, the large drip flow is conducive to the horizontal migration of water. The curve of wetting front is oval, the drip flow is conducive to the vertical infiltration of moisture, and the wetting front is more rounded. June) and 0.3 l h-1 drip flow in the boll opening stage (October) were less than 0.8 L h-1, accounting for only 78.3% of the latter. In the period from July to September, drip irrigation evapotranspiration It is obviously larger than the big dripper flow rate. Under brackish water drip irrigation, brackish water with 2.47 g L -1 had no effect on evapotranspiration, while salinity water with 3.50 g L -1 had significant inhibitory effect. The total amount of transpiration of saltwater irrigation cotton during the whole growth period was lower than fresh water and Brackish water irrigation decreased by 8.0%.