四川农业大学学报 ›› 2021, Vol. 39 ›› Issue (6): 807-813.doi: 10.16036/j.issn.1000-2650.2021.06.014

• 资源环境 • 上一篇    下一篇

滴灌施肥条件下土壤硝态氮空间分布规律室内模拟研究

孙富斌1, 尹娟1,2,3,*, 魏小东1, 马正虎1, 苏振娟1   

  1. 1.宁夏大学土木与水利工程学院,银川 750021;
    2.旱区现代农业水资源高效利用教育部工程中心,银川 750021;
    3.宁夏节水灌溉与水资源调控工程技术研究中心,银川 750021
  • 收稿日期:2021-04-07 出版日期:2021-12-30 发布日期:2021-12-31
  • 通讯作者: *尹娟,博士,教授,主要从事节水灌溉理论与技术、水资源高效利用方面的研究,E-mail:yj7115@126.com。
  • 作者简介:孙富斌,硕士研究生。
  • 基金资助:
    宁夏大学一流学科项目(NXYLXK2021A03)

Study on Distribution of Nitrate Nitrogen in Soil under Drip Irrigation

SUN Fubin1, YIN Juan1,2,3,*, WEI Xiaodong1, MA Zhenghu1, SU Zhenjuan1   

  1. 1. College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;
    2. Ministry of Education Engineering Center for Efficient Utilization of Agricultural Water Resources in Arid Regions, Yinchuan 750021,China;
    3. Ningxia Engineering Technology Research Center for Water-Saving Irrigation and Water Resource Regulation,Yinchuan 750021,China
  • Received:2021-04-07 Online:2021-12-30 Published:2021-12-31

摘要: 【目的】旨在提升宁夏中部干旱区枸杞田水肥管理水平,建立更加高效的水肥管理模式,以更好服务于当地节水-高效灌溉农业发展。【方法】研究采用点源滴灌方式,设氮肥浓度(0、200 和500 mg/L)、滴头流量(0.5、0.75和1 L/h)和灌水量(3、5 L)3个因素研究了土壤硝态氮含量随再分布时间、滴头流量、氮肥浓度的变化,在径向和垂直方向的运移规律。【结果】①不同土层深度(0~20 cm)再分布时间下的硝态氮含量随径向距离的增大呈递减的趋势;②不同径向距离(0~20 cm)处,滴头流量为0.5 L/h时,硝态氮含量随土层深度的增大先减小后增大,滴头流量为0.75、1 L/h时,硝态氮含量随土层深度的增大先减小后增大再减小;③在不同径向距离(0~20 cm)处,无氮肥时(F1,0 mg/L),硝态氮含量随土层深度的增大呈递增的趋势,氮肥浓度为F2(200 mg/L)、F3(500 mg/L)时,硝态氮含量随土层深度的增大先减小后增大;④再分布时间、滴头流量、氮肥浓度均与硝态氮含量呈极显著相关关系(P<0.01)。【结论】综合各项指标得出,当再分布时间为5 d、滴头流量为0.5 L /h、氮肥浓度为500 mg/L左右时能够满足本地区滴灌施肥条件下枸杞田(沙壤土)需氮要求。

关键词: 滴灌施肥, 土壤硝态氮含量, 再分布时间, 滴头流量, 氮肥浓度

Abstract: 【Objective】 This study aims to improve the water and fertilizer management level of Lycium barbarum field in the central arid region of Ningxia, and establish a more efficient water and fertilizer management mode, so as to better serve the development of local water-saving and high-efficiency irrigation agriculture. 【Method】 In this study, nitrogen concentration (0, 200, 500 mg/L), drip head flow (0.5, 0.75,1 L/h) and irrigation amount (3, 5 L) were used to study the variation of soil nitrate nitrogen content with the time of redistribution, drip head flow and nitrogen concentration.The law of migration in the radial and vertical directions. 【Result】 ①The nitrate nitrogen content in different soil depth (0-20 cm) decreased with the increase of radial distance; ②at different radial distances (0-20 cm), when the drip flow was 0.5 L/h, the nitrate nitrogen content first decreased and then increased with the increase of soil depth; when the drip flow was 0.75 L/h and 1 L/h, the nitrate nitrogen content first decreased, then increased and then decreased with the increase of soil depth; ③In different radial distance (0-20 cm), and the absence of nitrogen fertilizer (F1, 0 mg/L), nitrate nitrogen content increasing trend along with the increase of soil depth, nitrogen concentration is F2(200 mg/L), F3(500 mg/L), it along with the increase of soil depth increase with the decrease of the first; ④Redistribution time, drip flow rate and nitrogen concentration were significantly correlated with nitrate nitrogen content (P<0.01). 【Conclusion】 According to the comprehensive indexes, when the redistribution time is 5 d, the drip flow rate is 0.5 L/h, and the nitrogen concentration is about 500 mg/L, the nitrogen requirements of lycium barbarum field (sandy loam) under the condition of drip irrigation in this area can be met.

Key words: drip irrigation fertilization, soil nitrate nitrogen content, redistribution time, drip flow, nitrogen concentration

中图分类号: 

  • S275.6