土壤初始含水量对注射灌土壤水分运移分布特性影响试验研究

通过室内不同土壤初始含水量的注射灌水分入渗试验，研究了土壤初始含水量对注射灌土壤水分运移分布特性影响。研究表明：注射灌的累积入渗量与时间呈幂函数关系，土壤初始含水量越大，相同入渗时间的累积入渗量越大。在出水口下方土壤水分湿润范围较大，土壤含水量也较大，而在出水口上方则相反。土壤初始含水量越大，土壤湿润范围越大，距离出水口相同距离的土壤含水量越大。以上研究可为进一步补充注射灌理论技术提供基础。

Experiment study on impact from soil initial water content on water movement distribution characteristics of soil under injection irrigation

Through the indoor infiltration experiment of injection irrigation made on various soil initial water contents,the impact from the soil initial water content on water movement distribution characteristics of soil under injection irrigation is studied herein.The study shows that a power function relationship lies between the cumulative infiltration of the injection irrigation and the time,i.e.the larger the initial water content is,the bigger the cumulative infiltration in a same infiltration time will be.The wetting range of the soil under the outlet is larger with a larger water content,but it is reversed above the outlet.The larger soil water content is,the larger soil wetting range and then the larger the water content of the soil with the same distance to the outlet will be.The study made herein can provide a basis for the further supplement of theory and technology of the injection irrigation.