保水剂对滴灌土壤湿润体影响的室内实验研究

Laboratory experiment on the effects of super absorbent polymer on wetting front of drip irrigation

利用室内模拟实验，在均质土槽中埋设TDR时域反射仪自动检测滴灌条件下土壤水分，并采用suffer软件绘制水分等势图，研究了层施保水剂条件下点源交汇入渗及蒸发过程中土壤水分运动规律。结果表明：受保水剂的影响，入渗过程中，保水剂层土壤含水率迅速增大到23．60％，且大于0～20cm和30～60cm层土壤含水率；蒸发过程中，各层土壤含水率都在减少，在110d时，0～20cm土层的含水率为3．5％，30～60cm土层的含水率为4．5％，但20～30cm层土壤的含水率却为12．5％。因此，作物根系层施用保水剂可以起到蓄水保墒的作用。

The laws of soil water movement of point source interference infiltration and evaporation using super absorbent polymer were analyzed according to the laboratory experiments. Time-domain reflectometer （TDR） was buried in the bin with homogeneous soil to measure soil moisture automatically, and the software suffer was adopted to draw the water isobar. Results show that under the influence of super absorbent polymer, the soil moisture of the layer with super absorbent polymer reaches 23. 60% rapidly during the infiltration, which is lager than that of 0～20 cm and 30～60 cm soil layers. The moistures of all layers decrease during the evaporation. In the 110th day, the soil moistures in 0～20 cm and 30～60 cm layers are 3.5% and 4.5～, respectively, while the soil moisture in 20～30 cm is only 12.5%. Therefore, the application of super absorbent polymer can keep soil moisture for the root layer of crop.