间歇畦灌灌水技术及其节水机理的试验研究

间歇畦灌是一种节水型改进地面灌水新技术。本文就其影响间歇畦灌灌水质量的技术参数进行了田间正交试验，并对间歇畦灌的节水机理及其影响因素进行了探讨。通过对试验资料的分析研究，得出了获得最大灌水均匀度的技术参数最佳组合方案，发现了间歇畦灌节水主要是由于前次供水期间表层土壤形成致密层、土壤渗吸率下降、田面糙率变小等，在相同条件下，间歇畦灌比连续灌节水２１％，灌水效率提高１８．５％。

Experimental Studies on Technology and Water Saving Mechm 2nism of Intermittent Border Irrigation

Intermittent border irrigation is a new,water saving,modified technology of surface irrigation.This paper presents experimental results on the main technical parameters thm 2t influence the quality of intermittent border irrigation,and studies on the water saving mechm 2nism and influencing factors. By analysis of the experimental data, the optimum combinatory plan of irrigating technical parameters is obtained.Compared with continuous irrigation,intermittent border irrigation saves water mainly because of the forming of a compact texture of surface soil during the preceding supply of water,which causes soil infiltration rate to decrease and roughness coefficient of field surface,tofall and water flow advances fo become faster in the same conditions.