草地学报

草地学报 ›› 2021, Vol. 29 ›› Issue (11): 2428-2434.DOI: 10.11733/j.issn.1007-0435.2021.11.007

• 研究论文 • 上一篇    下一篇

不同氮效率型苜蓿氮素吸收差异与根系形态的关系及其对氮的响应

郝凤1,2, 于铁峰1, 刘晓静2, 高凯1   

  1. 1. 内蒙古民族大学农学院, 内蒙古 通辽 028042;
    2. 甘肃农业大学草业学院, 甘肃 兰州 730070
  • 收稿日期:2021-04-23 修回日期:2021-09-14 出版日期:2021-11-15 发布日期:2021-12-06
  • 通讯作者: 刘晓静,E-mail:liuxj@gsau.edu.cn
  • 作者简介:郝凤(1985-),女,黑龙江鹤岗人,博士,讲师,主要从事饲草栽培方向研究,E-mail:haofeng1026@163.com
  • 基金资助:
    内蒙古自治区自然科学基金项目（2019LH03011）；内蒙古民族大学博士科研启动基金项目（BS520）；内蒙古民族大学教育教学研究课题（YB2021024）；内蒙古民族大学博士科研启动基金项目（BS521）资助

Relationship between Nitrogen Uptake and Root Morphology of Alfalfa with Different Nitrogen Efficiency and Its Response to Nitrogen

HAO Feng1,2, YU Tie-feng1, LIU Xiao-jing2, Gao Kai1   

  1. 1. College of Agronomy, Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028042, China;
    2. Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China
  • Received:2021-04-23 Revised:2021-09-14 Online:2021-11-15 Published:2021-12-06

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摘要： 以高效型苜蓿（‘龙牧806’‘肇东苜蓿’）和低效型苜蓿（‘公农1号’‘陇东苜蓿’）为试验材料，采用营养液砂培法，在4个供氮量下（2.1，21，210和420 mg·L-1），研究紫花苜蓿苗期氮素吸收、分配的氮效率型差异及其与根系形态之间的关系。结果表明高效型苜蓿品种的株高、地上生物量、根重、总根长和根体积均显著高于低效型品种（P<0.05）；供氮量较低时（2.1和21 mg·L-1），高效型向根系分配了较大比例的氮素，而低效型则向地上部分配了较大比例的氮素，根系形态参数与总氮量呈显著正相关（P<0.05），且根重对氮素吸收的直接作用较大，直接通径系数是1.230和1.102。因此，在氮胁迫下，根系形态对氮吸收效率起重要作用，尤其是根系形态中的根重对其影响较大。

关键词: 苜蓿, 氮效率, 根系, 氮素吸收

Abstract: High nitrogen (N) efficient varieties (‘Longmu 806’ ‘Zhaodong’) and low N efficiency varieties (‘Gongnong No.1’‘Longdong’) were used to study the genotypic variations in total N uptake and N partition with different nitrogen efficiency and its relation to root morphology at four N levels (2.1,21,210 and 420 mg·L-1). Plant height,aboveground biomass,root dry weight,total root length,and root volume of high N efficient varieties were greater than that of low N efficiency varieties (P<0.05). The higher N accumulation in root in high N efficient varieties at low N supply (2.1 and 21 mg·L-1). The higher N accumulation in aboveground in low N efficient varieties at low N supply. There was a significant positive correlation (P<0.05) between root morphological parameters and total nitrogen,and nitrogen uptake was primarily controlled by root dry weight at low N supply,direct path coefficients were 1.230 and 1.102. When N is a limiting factor for plant growth,root morphology became more important in N uptake,and root dry weight was more important.

Key words: Alfalfa, Nitrogen efficiency, Root, Nitrogen uptake

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