【摘要】 膜下滴灌是一种既节水,又能抑制土壤盐分上移的灌水技术。该文着重研究在田间条件下,滴头流量、灌水量和灌水水质对微咸水点源入渗水盐运移的影响。研究结果表明,在充分供水条件下,水平湿润锋和积水锋面随时间的推进符合幂函数关系;滴头流量越小,沿土壤深度方向上的盐分含量越小;滴头流量越大,水平方向含盐量随距离增加的趋势越不明显;灌水量是微咸水灌溉条件下控制盐分累积的一个重要因素,灌水量不足,没有足够的入渗水量以确保盐分的淋洗;灌水矿化度的升高会显著增加土壤表层的含盐量。更多还原

【Abstract】 Drip irrigation under film is a new technology with great potential to use saline water safely, which can not only save water but also prevent soil salt from moving up. In the paper, Importance is focused upon the effectsof drip rate, irrigated water amount and water quality on water and salt movement during point source infiltration. Point source infiltration experiments wereconducted in field with different saline water and drip rates. The resultsindicate that power function fits well to the advances of horizontal wet front and ponding water area with time under the condition of sufficient water supply;the smaller the drip rate, the less the salt content along soil depth; the larger the drip rate, the more indistinctly the tendency of salt content increases with distance. It can also be found that irrigated water volume is a key factor to control salt cumulation when irrigating fields with saline water. Insufficient irrigation cannot guarantee enough leaching of soil salt for small infiltration volume. Besides, the rise of the salt content of irrigated water will increase salt content of the surface soil remarkably.更多还原