| 引用本文: | 马建国,杨 莹,董 娜,等.膜调控润灌在不同土壤类型下的技术参数确定[J].灌溉排水学报,2024,43(5):45-54. |
| MA Jianguo,YANG Ying,DONG Na,et al.膜调控润灌在不同土壤类型下的技术参数确定[J].灌溉排水学报,2024,43(5):45-54. |
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| 摘要: |
| 【目的】探究膜调控润灌在不同土壤类型和滴头流量下的土壤水分运移规律，确定不同土壤类型下的技术参数。【方法】基于室内试验数据建立HYDRUS-2D模型，设置4种土壤类型（砂土、壤土、砂质黏壤土、粉土）和3个滴头流量（0.9、2.1、3.2 L/h），探究膜调控润灌在不同土壤类型和滴头流量下的技术参数。【结果】HDYDRUS-2D模型可以准确模拟膜调控润灌条件下的土壤水分运移及分布，相对误差在5%以内，决定系数（R2）和均方根偏差（RMSE）分别为0.97和0.007；砂土因其饱和导水率大易造成渗漏，在膜调控润灌系统下需要进一步调整滴灌管埋深和流量，膜调控润灌能较好地适应其余3种土壤，灌水结束时膜上水量占总灌水量的比例高于70%，大大减少了灌溉水渗漏量；随着滴头流量的增加，壤土膜上水量的占比逐渐减小。【结论】砂土条件下，需要调整滴灌管埋深以减少水分深层渗漏；推荐在砂质黏壤土和壤土条件下采用2 L/h的滴头流量进行灌溉；随着流量的增加，粉土膜上水量占比不会降低，推荐采用3 L/h的滴头流量进行灌溉。 |
| 关键词: 土壤类型；膜调控润灌；水分运移；HYDRUS-2D模型 |
| DOI：10.13522/j.cnki.ggps. 2023330 |
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| Determining the technical parameters of the membrane-regulated subsurface irrigation for different soil types |
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MA Jianguo, YANG Ying, DONG Na, CHENG Wuqun, SHENG Lili, WU Xianbing, ZHANG Xiping
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1. Hebei Agricultural University, Baoding 071000, China; 2. Douhe Reservoir Affairs Center, Tangshan 063022, China;
3. Zhangjiakou Xingyuan Investment Development Group Co., Ltd, Zhangjiakou 075000, China
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| Abstract: |
| 【Objective】Membrane-regulated subsurface irrigation is a water-saving irrigation technique for water-scarce areas, and this paper is to experimentally determine its technical parameters for irrigation in soils with different textures.【Method】The studies were based on laboratory experiment and the HYDRUS-2D model. Infiltration of irrigation water into sandy soil, loam soil, sandy clay loam and silt soil under membrane -regulated irrigation was conducted experimentally with the dripping rate ranging from 0.9 to 3.2 L/h. The measured data were used to calibrate the HDYDRUS-2D model. 【Result】 The HDYDRUS-2D model can accurately simulate water flow in all soils under membrane regulated irrigation, with the relative errors less than 5%, the coefficient of determination and root mean square deviation being 0.97 and 0.007, respectively. The sandy soil was prone to leakage due to its elaborated hydraulic conductivity. In the membrane-regulated irrigation, adjusting the flow rate in the drip irrigation pipe was needed to improve irrigation efficiency in different soils. On average, the membrane-regulated irrigation worked well for all three soil types. At the end of the irrigation, the ratio of the water on the membrane to the total irrigation amount was more than 70% in all soils, indicating a reduction in water leakage loss. As the dripping rate increased, the proportion of water on the film in the loam soil decreased gradually; the dripping rate in irrigation for this soil should be controlled below a critical value. In the sandy soil, it was required to adjust the buried depth of the drip irrigation pipes to reduce leakage loss. The optimal dripping rate for the sandy clay loam soil and the loam soil was 2 L/h. As the flow rate increased, there was no significant change in the proportion of water on the membrane in the silt soil; the optimal dripping rate for the silt soil was 3 L/h. 【Conclusion】Our experimental and numerical studies showed the optimal dripping rate for the membrane - regulated surface drip irrigation was 2 L/h for the sandy clay loam soil and the loam soil, and 3 L/h for the silt soil. |
| Key words: soil types; membrane-regulated irrigation; water transport; HYDRUS-2D model |
