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通过模拟大田滴灌的双点源试验,探求了沙壤土土质下,不同滴头流量、滴头间距对水平湿润锋和交汇锋以及电导率的影响。结果表明:随着入渗时间的增加,交汇锋和水平湿润锋运移距离都在增加;当其他条件一定时,流量越大或者间距越小,湿润锋和交汇锋运移的速率越大,土壤湿润体越均匀;相同间距情况下在0~20 cm深度内大流量的交汇区电导率小,在20~40 cm深度内小流量的电导率大;在相同流量情况下0~10 cm深度内滴头间距大的交汇区电导率大,在10~40 cm深度内滴头间距小的电导率大。
By simulating the double-point source experiment of field drip irrigation, the effects of different dripper flow and dripper spacing on horizontal wetting front and cross-flow front and conductivity were studied under sandy loam soil. The results show that with the increase of infiltration time, the migration distance of confluent front and horizontal wet front increases. When the other conditions are constant, the larger the flow rate or the smaller the spacing, the greater the migration rate of wetting front and crosshead, The more homogeneous the soil wetting body, the smaller the conductivity of the cross flow at the depth of 0 ~ 20 cm with the same spacing is small, and the conductivity of the small flow at the depth of 20 ~ 40 cm is large; at the same flow rate, the depth of 0 ~ 10 cm Within the intersection of the dripper spacing large conductivity large conductivity in the depth of 10 ~ 40 cm dripper spacing small conductivity.