旱平地果园微地形打孔集流技术研究

Study on the Hole Collecting Rainfall in Dry Flat Ground Orchard

针对半干旱地区存在降水利用率低的问题，在山西省隰县旱塬区旱平地果园进行了打孔微地形集流以提高大雨利用率的试验研究。结果表明，一次７６．５ｍｍ的降水发生后，５０ｃｍ深孔洞的水平有效保水半径为６０ｃｍ；孔心处４０ｃｍ～６０ｃｍ土层内大雨的有效保存率比对照提高了３６．２％。微地形打孔集流是增加雨水深层入渗比例和提高大雨利用率的适用新技术。

This paper offered a new technique of hole collecting rainfall in order to increase the utility rate of rainfall in semi arid land. The orchard test in Xixian County of Shanxi Province showed that: after a rainfall of 76.5 mm a hole depth of 50 cm held more 30 mm soil water or more 36.2% from 40 cm to 100 cm soil depth in 10 days than that of the contrast, and the upmost effective radius of the hole collecting water was 60 cm. This newtechnique could increase subsoil water and plant effective water after heavy rainfall in semi arid area.