棉花膜下滴灌土壤盐分运移规律分析

为探讨棉花滴灌方式下土壤水盐运移规律,在棉花不同生育期运用烘干法和电导法,从水平方向和垂直方向测定距离滴灌带不同距离的土壤含水量和土壤盐分,结果表明:膜下滴灌条件下棉花整个生育期土壤盐分含量的运移规律为:一水前土壤中的含盐量以垂直方向0-10 cm土层内最大,随生育期的推后各土层含盐量都有不同程度的增加,土壤产生积盐现象.滴头处各土层含盐量相对较低,主要因为滴头下水分不断下滴下渗,使该处各层土壤中的盐分亦随水移动而被淋洗到浸润体外缘,从而使主要根系层的土壤形成了一个低盐区.

Study on Soil Salt Movement in Drip Irrigation of Cotton Under the Plastic Mulch

To explore the law of water and salt movement in drip irrigation of cotton field, soil moisture and salt are studied from the horizontal and vertical directions in different stages of cotton using drying and soil conductivity. The results showed that the soil salt in 0-10 cm was the highest before first irrigation throughout the growing period of cotton. With the post-reproductive period, each soil layer salt quantity have the increase of different level and resulted to the soil salt accumulation. Drip emitter contain salt quantity is relative lower mainly due to constant water drip and infiltration, which resulted to form a lowsalt zone in the main root system layer.