小滴头流量下灌水频率对膜下土壤湿润区的影响  

Effect of Drip Irrigation Frequency on Mulched Soil Wetting Pattern with Micro-drip Discharge

作　　者：马丽娟[1] 李明思[1] 李东伟[1] 周艳[1] 刘东[1] 

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003

出　　处：《灌溉排水学报》2011年第6期100-102,114,共4页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51069012)

摘　　要：为了探明灌水频率对小滴头滴灌土壤湿润区的影响,在实验室对沙土和中壤土进行了膜下间歇滴灌试验,滴头流量分别为0.3、0.5、0.7L/h;灌水频率分别为1、2、3、4次灌完。在灌水量相同的情况下观测了土壤的湿润区运移过程和含水率分布。结果表明,小滴头流量下改变滴水频率对土壤湿润体的大小影响很小;随着灌水频率的增加,土壤湿润锋水平运移速度减小,但是,增加滴灌频率可明显提高膜下浅层土壤含水率水平,为作物根系吸水提供理想的水分环境。The experiments of mulched intermittent drip irrigation were carried out on sand soil and sandy loam soil in laboratory to research into the influence of drip irrigation frequency on soil wetted pattern with micro-drip discharge. The drip discharge treatments were 0.3, 0.5, 0.7 L/h, and irrigation frequency was treated to drip the same total water volume by 0, 1, 2, or 3 interludes. The variation of soil wetted pattern was observed as well as the distribution of soil water content. Experimental results show that enhanced ir- rigation frequency is beneficial to improve soil moisture status rather than soil wetting pattern; the enhanced irrigation frequency can result in a lower movement velocity of soil wetted horizontal front, but a higher water content on top soil which is favorable for crop root system to uptake water.

关 键 词：滴灌 滴头流量 灌水频率 土壤湿润区 

分 类 号：S275.6[农业科学—农业水土工程]