【摘要】 水分是沙区农田的主要限制因子,研究灌溉对沙区农田土壤水分的影响,对该区域农业水资源利用以及农业生产具有指导意义。为揭示乌兰布和沙漠不同土壤类型农田土壤水分规律及深层渗漏损失,分析播种-拔节期土壤体积含水量变化特征与深层渗漏规律。研究结果:1)观测期内不同土壤类型农田土壤含水量大小顺序依次为:砂土农田<壤土农田<粘土农田。4月17日灌溉211. 5mm对不同土壤类型0～150cm层土壤含水量均产生显著影响(p <0. 01),影响大小依次为:砂土农田、壤土农田、粘土农田。2)不同土壤类型农田在监测期内150cm土层均持续有深层渗漏,且211. 5mm灌溉量使砂土农田与壤土农田深层渗漏量增大,粘土农田无明显变化。观测期内砂土农田共产生深层渗漏138. 2mm,壤土农田共产生深层渗漏74. 6mm,粘土农田共产生深层渗漏3mm。更多还原

【Abstract】 Water is the main limiting factor for desert farmland. The study of the influence of irrigation on soil water in farmland has guiding significance for the utilization of agricultural water resources and agricultural production in this area. In order to reveal the soil moisture regularity and deep soil recharge( DSR) in the farmlands with different soil types in Ulan Buh Desert,the change characteristics of soil volume content and the law of DSR were analyzed in the sowing-jointing period. The result is:(1) In the observation period,the order of soil water content in different soil types was: sandy farmland < loam farmland < clay farmland. Soil water content in 0 ～150 cm layers for different soil types were significantly affected by irrigation of 211. 5 mm( P < 0. 01),in April17 th,and the influence order was: sandy soil farmland,loam farmland and lay farmland.(2) The 150 cm soil layer of different soil types continued to have DSR,and the amount of 211. 5 mm irrigation made the DSR increase in the sandy farmland and loam farmland,and no obvious changing in the clay farmland,in the monitoring period. There was DSR of 138. 2 mm in the sandy farmlands,and 74. 6 mm in loam farmland,and 3 mm in clay farmland,during the observation period.更多还原