滴头流量对不同质地棉田土壤湿润区的影响研究
Effect of Different Drip Head Flow Rates on Soil Wetted Zones in Cotton Fields
摘要
Abstract
In order to clarify the soil wetting front and changes in soil water,salt and temperature in cotton fields under drip irrigation tapes with different flow rates,drip simulation studies were carried out on sandy and clayey soils by selecting drip irrigation tapes with 1.1 L·h-1(small flow rate),2.6 L·h-1(medium flow rate)and 3.2 L·h-1(large flow rate).The results showed that soil conductivity and volumetric water content at 1.1 L·h-1,2.6 L·h-1 and 3.2 L·h-1 flow rates followed the same trend for the same drip time on sandy and clayey soils.In the horizontal direction,the conductivity showed a decrease from the periphery towards the drip head,with the sandy soil showing the largest decrease of 91.03％at 1.1 L·h-1 flow rate,and the clay soil also showing the largest decrease of 87.38％at 1.1 L·h-1 flow rate.Vertical direction decreases from deep to surface with maximum 93.91％decrease in sandy soil at 1.1 L·h-1 flow rate and 83.93％decrease in clay at 2.6 L·h-1 flow rate.In contrast,the trend of soil volumetric water content in the horizontal and vertical directions is opposite to that of electrical conductivity,with negative correlation.The sandy soil has a maximum wetting front transport distance of 35.0 cm horizontally at 2.6 L·h-1 flow rate and 20.0 cm vertically at 3.2 L·h-1 flow rate,while the clay soil has a minimum wetting front transport distance of 27.0 cm horizontally at 1.1 L·h-1 flow rate and a maximum wetting front transport distance of 15.0 cm vertically at 1.1 L·h-1 flow rate.The shape of the wetted zone is nearly semicircular(narrow and deep)in sandy soils and nearly elliptical(wide and shallow)in clayey soils.The angle between the horizontal and vertical wetting fronts at 1.1 L·h-1 flow rate and the horizontal wetting front is 47.98° for clayey soils and 51.34° for sandy soils at 3.2 L·h-1 flow rate.Combined with the wetting fraction transport distance,a comprehensive analysis shows that sandy soils have deep vertical infiltration and small horizontal diffusion at a flow rate of 3.2 L·h-1,while clay soils have a large infiltration depth and small surface diffusion at a flow rate of 1.1 L·h-1,which is conducive to the reduction of surface runoff.Therefore,it is recommended to select high flow drip irrigation tapes for sandy soils and low flow drip irrigation tapes for clayey soils in order to provide reference for precision irrigation of cotton fields in the division.关键词
不同流量滴灌带/棉田土壤/湿润区/电导率/角度Key words
drip irrigation strips with different flow rates/cotton field soil/wet zone/conductivity/angle分类
农业科技引用本文复制引用
张冬冬,邵延慧,焦润兴,陈玲,张涛,卜东升,蒲艳梅..滴头流量对不同质地棉田土壤湿润区的影响研究[J].绿洲农业科学与工程,2026,11(1):50-59,10.基金项目
新疆"天山英才"培养计划青年拔尖人才项目(2024TSYCJC0087) （2024TSYCJC0087）
师市科技计划项目—阿拉尔垦区不同干播湿出年限棉田土壤盐分变化规律研究(2024NY10) （2024NY10）
国家现代农业产业技术体系棉花产业技术体系(CARS-15-43) （CARS-15-43）
南疆"干播湿出"棉花节水控盐与高产高效栽培技术集成与示范(NYHXGG,2023AA303),第一师"干播湿出"棉花节水控盐与高产高效栽培技术示范应用 Xinjiang"Tianshan Talents"Cultivation Programme for Outstanding Young Talents(2024TSYCJC0087) （NYHXGG,2023AA303）
Division City Science and Technology Programme Project-Alar Reclamation Area Different Dry Sowing Wet Out Years Cotton Field Soil Salinity Change Law Research(2024NY10) （2024NY10）
Supported by the earmarked fund for(CARS-15-43) （CARS-15-43）
Integration and Demonstration of Water-Saving,Salt-Control and High-Yield Efficient Cultivation Techniques for'Dry-So wing,Wet-Emergence'Cotton in Southern Xinjiang(NYHXGG,2023AA303),Demonstration Application of'Dry-Sowing,Wet-Emergence'Cotton Water-Saving,Salt-Control and High-Yield Efficient Cultivation Techniques in the First Division （NYHXGG,2023AA303）
