微咸水膜下滴灌条件下绿洲棉田土壤盐分的时空变化规律试验研究

Experimental Study on Spatio-temporal Change of Soil Salinity in Cotton Field of Oasis under Drip Irrigation under Plastic Film with Slight Saltwater

在相同灌水量条件下,以不同比例混合地下咸水(3.56 g/L)和地表淡水(0.4 g/L),采用膜下滴灌方式充分灌溉棉田,探求土壤盐分的时空变化规律。研究表明,棉花生长期间土壤盐分的变化主要受土壤水分运移和地面植被覆盖度的影响;表层土壤盐分波动大,深层土壤盐分波动小;监测层在总含盐量上比未灌水处理前低,但所有微咸水处理的都比淡水对照的大;膜下滴灌棉田盐分的变化主要受灌溉水和蒸散发的影响。

Under the condition of same water quantity, the irrigation water is mixed with different proportion of saline groundwater （ DOM at 3. 56 g/L） and surface water （ DOM at 0. 4 g/L） to irrigate cotton field by using drip irrigation under plastic film to seek spatio-temporal change of soil salt contents in cotton field in Oasis. The research result indicates that the change of soil salt contents during cotton growth is mainly effected hy soil water movement and surface vegetation cover degree. The salt contents of the surface soil have a higher fluctuation than deep soil. The total salt contents of irrigation treatment is a little lower than treatment without irrigation in whole monitor soil layers, but salt contents of all treatment with saline water is higher than potable water treatment. Soil salinity of cotton field under drip irrigation under plastic film is mainly affected by irrigation water and surface soil evapotranspiration.