【摘要】 根据大量田间波涌灌实验分析,对地表土壤物理性质变化进行了研究,证实了土壤容重的变化对波涌灌节水性有重要作用。同时也认识到,波涌灌与传统连续灌地表土壤都可以形成致密层,二者的结构相似。但重要的是波涌灌利用这种致密层的形成和发展,改善了入渗特性和地表水流特性,从而达到节水的效果。更多还原

【Abstract】 Based on the analysis of field surge irrigation tests on a large scale,this, this paper studies the changes in physical behaviors of surface soil and confirms that the variation in soil bulk density has an important effect upon water saving by surge flow irrigation. Also,we have come to realize that surface sealing can be formed on surface soil of irrigated lands through surge flow irrigation and traditional continuous irrigation,but the structures between the two are similar. However,what is important is that the formation and development of this surface sealing by surge irrigation can improve the behaviors of infiltration and surface water flow thereby to achieve the results of water saving in irrigation.更多还原