滴灌条件下沙地肉苁蓉土壤水分空间分布特性研究

目的]研究同一点源滴灌条件下沙地肉苁蓉土壤水分时空变化特性,以有效地提高沙地土壤水分利用率和肉苁蓉产量。方法]以栽植接种过肉苁蓉梭梭的沙地为研究对象,用同一滴头流量对其滴灌12 h,监测水平及垂直方向各土层水分含量动态;探讨同一滴头流量下不同灌溉区垂直方向上各层土壤含水率的差异和不同灌水条件下沙地土壤水分空间分布特征。结果]表层土壤相对湿度受降水和灌溉影响较大,0～20 cm土壤相对湿度变化最为剧烈,20～80 cm土壤相对湿度相对稳定,无灌溉处理的耗水深度主要集中在60～80 cm土层。12 h灌水停止后,水分发生再分布,待水分分布稳定后测定,60 cm以上土层土壤相对湿度较灌水前提高27.1%～58.8%;在60 cm深处测得水平方向水分主要分布在0～30 cm土壤,水分分布和含量有利于梭梭根系对水分的合理高效利用以及促进肉苁蓉的生长。结论]研究结果为滴灌条件下沙地肉苁蓉人工栽植水分补偿技术提供了一定的理论依据。

Study on the Spatial Distribution Features of Sand land Soil Moisture under the Drip Irrigation of Cistanche deserticola

Objective] To study the spatial and temporal distribution features of sand land soil moisture under the drip irrigation of Cistanche deserticola,so as to effectively improve the soil water use efficiency and Cistanche deserticola yield.Method]Cistanche deserticola was inoculated into the 3-year-old Haloxylon ammodendron which grew on the sand land,and then drip irrigated at the same discharge rate for 12 h,the changes of the moisture content at the horizontal and vertical direction were detected,so as to ...