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不同施N浓度下滴头流量对土壤水分运移的影响研究 预览

Effects of Different N Concentration on Soil Water Transport
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摘要 针对宁夏中部干旱区枸杞滴灌施肥条件下,土壤水分分布规律不明确、灌溉施肥制度不完善等问题,开展了同一施氮浓度不同滴头流量的点源滴灌入渗实验。采用室内土箱模拟,设置施氮浓度(200、300、400、500mg/L)和滴头流量(0.3、0.5、0.7、0.9L/h)两因素,研究滴头流量对湿润体水平方向和竖直方向土壤水分分布的影响。研究结果表明:滴头流量是影响土壤含水率的主要因素。同一施氮浓度下,竖向含水率较水平方向高,随滴头流量的增大含水率逐渐增大,且含水率与滴头距离呈二次多项式;湿润体上部含水率等值线大体呈“U”字形分布,中部大体呈“屋脊形”,下部大体呈水平带状分布;滴头下方存在高含水区,且随滴头流量的增加,高含水区范围不断扩大。认为滴头流量与土壤含水率呈正相关关系,含水率的大小随着滴头流量的增大而增大,研究结果可为宁夏干旱区枸杞种植滴灌制度提供数据支撑。 This paper is an attempt to solve the problems such as unclear soil water distribution law and imperfect irrigation and fertilization system under the condition of drip irrigation and fertilization of Lycium barbarum in the arid areas in central Ningxia.The effects of four-level nitrogen concentration (200, 300, 400, 500 mg /L) and four-level droper flow (0.3, 0.5, 0.7, 0.9L/h) on soil moisture distribution in the horizontal and vertical directions of the wetting body are studied by using indoor soil box simulation.The results show that the droper flow is the main factor affecting the moisture content of soil moisture.Under the same nitrogen concentration, the vertical water cut is higher than the horizontal water cut, and the water cut gradually increases with the increase in the droper flow, and the water cut and the distance between the tip presents a quadratic polynomial relationship.The upper moisture content contours in the humid area are generally u-shaped, the middle moisture content contours are generally roof shaped, and the lower moisture content contours are generally horizontally zoned.There is a high water-cut area under the droper flow, and the range of high water-cut area increases with the increase in the flow rate.The research results can provide data support for the drip irrigation system of lycium barbarum plantation in the arid regions of Ningxia.
作者 苏振娟 尹娟 吴军斌 刘宇朝 刘学智 SU Zhen-juan;YIN Juan;WU Jun-bin;LIU Yu-zhao;LIU Xue-zhi(School of Civil Engineering and Water Conservancy, Ningxia University, Yinchuan 750021, China;Engineering Research Center for Efficient Utilization of Water Resources in Modern Agriculture in Arid Regions, Yinchuan 750021,China;Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation,Yinchuan 750021,China)
出处 《中国农村水利水电》 北大核心 2019年第7期29-34,共6页 China Rural Water and Hydropower
基金 宁夏大学一流学科项目(NXYLXK2017A03) 宁夏水利厅科技教育处项目(20140709) 宁夏大学研究生创新项目资助(GIP2018062)。
关键词 水分运移 滴头流量 单点源 湿润体 water distribution droper flow single point source wet body
作者简介 苏振娟(1992-),女,硕士研究生,主要从事节水灌溉理论与技术。E-mail:1450245123@qq.com;通讯作者:尹娟(1971-),女,博士,教授,从事节水灌溉与水资源高效利用方面的研究。E-mail:yj7115@126.com。
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