盐分胁迫膜下滴灌对土壤水盐分布及棉花产量的影响OA

Investigating the characteristics of soil water-salt transport,crop yield,and water use efficiency under salt-stressed mulched drip irrigation,and determining the suitable salt concentration of irrigation water for crop growth,are of great significance for improving water resource utilization efficiency.This paper investigated the water-salt dynamics in cotton fields under mulched drip irrigation with different irrigation water salinity concentrations,as well as cotton yield and water use efficiency(WUE),through field experiments.The results showed that the soil moisture content between drippers was significantly higher than that between belts in the 0~100 cm soil layer during the growth period of cotton,with the 40 cm soil layer reaching 32.6%,and soil salt content between drip belts in the 0~100 cm soil layer was higher than that between drippers.The treatment of irrigation water with a salt concentration of 3 g/L formed a diluted zone in the soil layer of cotton roots,with a soil salt content between 0.64 and 0.81 g/kg.The yield and WUE of cotton under the treatment of irrigation water with a salt concentration of 3 g/L were close to those under the treatment of conventional fresh water irrigation,and the yield of cotton under the treatment of irrigation water with a salt concentration of 6 g/L decreased significantly,with only 3 970.1 kg per hectare,compared to conventional freshwater irrigation,the yield reduction is about 23.5%.From the perspective of the soil water-salt environment for cotton growth,economic benefits,and efficient utilization of saline water resources,mulched drip irrigation with irrigation water salinity not exceeding 3 g/L can ensure that the yield and WUE of cotton reach the optimal levels.