间歇灌节水高产机理研究

A Study on the Mechanism of Water Conservation and Yield Increase Under Intermittent Fow Irrigation

本试验研究采用灌溉──土壤水分──植物系统──小气候系统理论体系，测定间歇灌供水条件下土壤水分入渗特性的变化、作物生育性状和农田小气候相互关系，定量地提出间歇灌节水高产机理在于土壤表面形成了致密层，沟（畦）土壤表面糙率的降低和适时适量地满足作物各生育期的需水要求．

Based on the theory of soil-Plant-Atmosphere Continuum,a study on changes in soil-moisture infiltration characteristics and the relationship between plant development and field micro-climate that appear under intermittent flow irrigation has been conducted. The meshanism of water conservation and yield increase by this irrigation method,by guantitative analysis,lies in that soil clods are partially dissolved and settled to form a silty, slick surface. clay particles present in the soil continue to swell even as the flow recedes.The effect is a reduced infiltration and a reduced roughness. In addition,it is possible to meet plants'water demands in a timely and adeguately manner provided appropriate intermittent flow irrigation is adopted.