苜蓿地人工降雨试验研究

Experimental research on artificial rainfall in medic fields

利用人工降雨试验装置，进行了苜蓿地、玉米地等降雨、入渗规律的试验。试验研究表明，苜蓿地稳定入渗速率为１．００９ｍｍ／ｍｉｎ，比玉米地等高３３％以上。苜蓿地接纳天然降雨的能力较强，对天然降雨的利用率也比较高。苜蓿根系粗、长，发育较深，它极大地改善了土壤及土壤剖面的渗透能力。

The experiments of the regular patterns of rainfall infiltratio into medic and maize fields with an artificial rainfall test device have been carried out. The experiments indicate that the stable infiltralion ration in medic fields is 1.009mm/min, 33% more above that in maize fields. The ability of accepting natural rainfall and the utilization rate of natural rainfall of medic fields are higher than that of maize fields. The roots of medic are rougher, Longer and developed, so they extremly improve soil and infiltration ability of soil sections.[