民勤沙区生态防护林根灌节水效应研究

Water Saving Effect of Root Irrigation in Minqin Sandy Area Ecological Protection Forest

为研究直插式根灌条件下的土壤水分分布和根灌节水效率,在民勤荒漠区3种立地类型进行根灌和滴灌试验比较。结果表明:(1)生态林渗水性比较好,沙生植物次之,最小的是枣树试验区;(2)随着土壤深度的加深,阴阳离子浓度也不平衡,所以当土壤深度在0~60 cm时,土壤呈碱性,而当土壤深度在60~120 cm时,土壤偏酸性;(3)根灌与滴灌的土壤水分入渗率相比较,根灌更有利于提高土壤含水率;(4)试验地直插式根灌比地表滴灌节水效率高。综上所述,根灌的节水效应比滴灌高,所以在民勤干旱荒漠区可以采用根灌供水,同时也为荒漠地区的节水灌溉提供了新的思路。

We researched the condition of soil moisture distribution and root irrigation efficiency under root irrigation,compared root irrigation and drip irrigation in three different types of desert area in Minqin.The results showed that：（1） ecological forest had the best water permeability,the second was desert plants,then was jujube test area;（2） with deepening of soil depth,cation and anion concentration was not in balance,when the depth was 0-60 cm and 60-120 cm,the soil was alkaline and acidity;（3） comparing the soil water infiltration rate of root irrigation and drip irrigation,the root irrigation was more favorable to improve the soil moisture content;（4） root irrigation had higher efficiency than drip irrigation.To sum up,the efficiency of root irrigation was higher than that of drip irrigation,so root irrigation could be applied to Minqin arid desert area.At the same time,the study provided a new approach for water saving irrigation in desert area.