涌泉根灌湿润体特征值变化规律研究

在米脂山地微灌枣树示范基地进行原状土涌泉根灌人渗试验,研究了不同流量、不同灌水历时条件下涌泉根灌湿润体特征值的变化规律.结果表明:湿润体的水平扩散半径、向上人渗距离、向下人渗深度随流量的增大而增大,且均与入渗时间有显著的幂函数关系;在相同流量情况下,向上人渗最快.水平扩散次之,向下人渗最慢;湿润体体积受灌水量和流量的影响;在不同流量条件下,湿润体体积与灌水量间,湿润体水平扩散半径、垂直扩散距离与灌水量间均存在极显著的幂函数关系;针对五年生枣树根系分布特征,确定了枣树适宜灌水时间和灌水量.

Study on Eigenvalues of Wetted Soil under Surge Root Irrigation

Undisturbed soil surge root irrigation infihration experiment was carried out at mountain micro-irrigation demonstration base for jujube at Mizhi,and the variation of eigenvalues of wetted soil is studied under the condition of different flows and diachronic.Results show that the horizontal diffusion radius.upward infiltration distance,downward infiltration depth all increase with flow increasing,and they all have a significant power function relationship with infiltration time;under the condition of the same flow,upward infiltration is the fastest,horizontal diffusion is in the second place,and downward infiltration is in the last place;wetted soil volume is influenced by irrigation amount and flow;under the condition of different flows,irrigation amount has a very significant power function relationship with wetted soil volume.wetted soil horizontal diffusion radius and vertical diffusion distance;under the condition of five flows and according to the root distribution characters of the jujube of five years,suitable irrigation time and irrigation amount are determined.