垂直线源灌线源长度对湿润体特性的影响

垂直线源灌可将水分直接输送到果树的根系，减少土面蒸发损失，以提高水分利用效率。通过模拟试验，研究了线源长度对土壤湿润体变化特性的影响。结果表明，不同线源长度土壤表面水平湿润半径、最大水平湿润半径和垂直湿润深度均与入渗时间的平方根呈线性关系，线源长度对土壤表面水平湿润半径和最大水平湿润半径的影响不明显，土壤表面水平湿润半径与最大水平湿润半径的比值和入渗时间的平方根符合线性关系，土壤表面水平湿润半径与垂直湿润深度的比值随入渗时间的增加而增大，随线源长度的增加而减小。这些研究结果可为垂直线源灌技术参数确定提供参考。

Influence of line source length of vertical line source irrigation on wetted soil change characteristics

Vertical line source irrigation system can transport water to the root of fruit trees directly for increasing water use efficiency by reducing soil surface evaporation. A simulated experiment was performed to study the effects of line source length on wetted soil characteristics. Results showed that there were linear relationships between the square-root of infiltration time and the surface horizontal wetted radius, maximum horizontal wetted radius and vertical wetted depth of different line source length. The line source length had an unsignificant effect on the surface horizontal wetted radius and maximum horizontal wetted radius of soil. It also showed that there was a linear relationship between the square-root of infiltration time and the ratio of the surface horizontal wetted radius to maximum horizontal wetted radius of soil. The ratio of the surface horizontal wetted radius to the vertical wetted depth of soil increased trends with infiltration time but exhibited decreasing tendency with the line source length increasing. These results can provide references for determining vertical line source irrigation technology parameters.