HE Jing,BAI Dan,GUO Lin,et al.Study on Wetted Volume of Silt Loam Under Sub-irrigation with Vertical Tube Emitter[J].Research of Soil and Water Conservation,2016,23(06):69-72.
竖管地下灌溉粉质壤土入渗湿润体的试验研究
- Title:
- Study on Wetted Volume of Silt Loam Under Sub-irrigation with Vertical Tube Emitter
- Keywords:
- vertical tube emitter; wetted soil volume; sub-irrigation; soil moisture content; orthogonal experimental design
- 分类号:
- S275.4
- 摘要:
- 竖管灌水器是一种在低压（0.6～2.0 m）状况下对作物进行根部地下灌溉的新型灌水技术的核心部件。为了研究该灌水器在不同影响因素不同组合情况下湿润体特征参数值的变化，为竖管灌水器的进一步研究提供借鉴。试验采用正交试验设计安排了9组试验对压力水头、土壤初始含水率、竖管灌水器的竖管直径和土壤容重（每个因素取3个水平）4个因素进行了室内试验研究。入渗试验7 h之后获得的结果表明：湿润体的湿润半径大小排序为Y负≥X≥Y正，湿润体的含水率分布在水平方向呈现为圆形扩散，而竖直方向呈现为椭圆形扩散，表明重力对水分入渗有一定的影响。竖管地下灌溉湿润体平均含水率变化范围为7.5%～33.3%，能够更好地满足不同作物的需水要求。
- Abstract:
- Vertical tube emitter as a new sub-irrigation emitter which works under a low pressure head (0.6~2.0 m) for the root system growth zone, studying its infiltration characteristic is a necessary. The orthogonal experimental design was adopted to arrange the influence factors including pressure head, initial soil moisture content, diameter of vertical tube and soil bulk density to Table L9(34) of orthogonal experimental design (all the factors have 3 levels) and to study the characteristic parameters of wetted soil volume under sub-irrigation with vertical tube emitter, all the test followed the same study time (7 h). After the test, the radius of wetted soil volume had been measured by getting it out of the soil box and it was a whole because of the matrix potential. The radius of soil wetted volume was measured by manual inspection, the soil wetted volume was divided into 2 sections along axis Y. Then, the interval was marked as 2 cm for a test point to collect little wetted soil, oven drying method was used to measure the soil moisture content. The results pointed out that the order of radius was Ynegative axis ≥ Xaxis ≥ Ypositive axis, and moisture content had an irregular distribution as like in horizontal plane as a circle, but in vertical plane as a ellipse, as well as that the variation of the average moisture content in soil wetted volume of vertical tube sub-irrigation greater than micro-moist irrigation can have a good satisfaction for water demand of different crops. This conclusion may have important directive significance for the further study on infiltration performance of a vertical tube emitter in subsurface irrigation and the application of a vertical tube emitter.
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备注/Memo
收稿日期:2015-04-15;改回日期:2016-04-29。
基金项目:国家自然科学基金（41571222；51279156）
作者简介:何靖(1992-),男,陕西咸阳人,硕士研究生,主要从事节水灌溉理论与技术研究。E-mail:694081783@qq.com
通讯作者:白丹(1960-),男,重庆人,博士,教授,博士生导师,主要从事节水灌溉理论与技术研究。E-mail:baidan@xaut.edu.cn