欢迎访问《草业学报》官方网站,今天是

草业学报 ›› 2025, Vol. 34 ›› Issue (11): 161-173.DOI: 10.11686/cyxb2024452

• 研究论文 • 上一篇    

施氮量和混播方式对燕麦/饲用豌豆间作系统氮素吸收和干物质产量的影响

鲍根生1,2,3(), 李媛1,2,3, 冯晓云1,2,3, 赵倩1,2,3   

  1. 1.青海大学畜牧兽医科学院,青海 西宁 810003
    2.青海省畜牧兽医科学院,青海 西宁 810016
    3.青海省青藏高原优良牧草种质资源利用重点实验室,青海 西宁 810016
  • 收稿日期:2024-11-18 修回日期:2025-03-17 出版日期:2025-11-20 发布日期:2025-10-09
  • 通讯作者: 鲍根生
  • 作者简介:E-mail: baogensheng2008@hotmail.com
    鲍根生(1980-),男,青海乐都人,副研究员,博士。E-mail: baogensheng2008@hotmail.com
  • 基金资助:
    青海省科技厅重点研发与转化计划项目(2024-NK-135);国家重点研发计划项目(2022YFD1602301)

Effects of intercropping planting patterns and nitrogen addition level on nitrogen absorption and biomass within oat-pea intercropping systems

Gen-sheng BAO1,2,3(), Yuan LI1,2,3, Xiao-yun FENG1,2,3, Qian ZHAO1,2,3   

  1. 1.Academy of Animal Science and Veterinary Medicine,Qinghai University,Xining 810003,China
    2.Qinghai Academy of Animal Science and Veterinary Medicine,Xining 810016,China
    3.Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau,Xining 810016,China
  • Received:2024-11-18 Revised:2025-03-17 Online:2025-11-20 Published:2025-10-09
  • Contact: Gen-sheng BAO

摘要:

燕麦与饲用豌豆间作种植是高寒区人工草地生产力提升的主要途径,同时,氮添加也是人工草地饲草产量增加的关键栽培措施。然而,不同间作种植方式和氮添加对燕麦与豌豆间作体系产量增加及氮素吸收方面影响的研究较少。以青海高原人工草地建植主要饲草-燕麦和饲用豌豆为对象,研究种植方式(单播、同行混播和隔行间作)和氮添加(未添加、低氮和高氮)对燕麦和豌豆饲草产量和氮素吸收的影响。结果表明:1)隔行间作种植燕麦和单播豌豆生物量(茎叶和根系)最高,而同行混合间作燕麦和豌豆生物量最低。高氮添加能显著增加隔行和同行混合间作燕麦生物量,而高氮添加后单播和间作种植豌豆生物量显著降低。2)间作种植能显著增加燕麦茎叶、根系全氮和土壤速效氮含量,而单播种植豌豆根系的全氮和土壤速效氮含量最高。高氮添加的单播燕麦和豌豆根系全氮含量显著高于隔行间作燕麦,而氮添加处理的燕麦和豌豆同行混合间作土壤的硝态氮和铵态氮含量显著高于单播和隔行间作土壤。3)结构模型方程结果表明间作种植和氮添加对燕麦生物量积累、茎叶和土壤氮素增加具有促进作用,而对豌豆却呈抑制生物量生长、降低茎叶及土壤氮素含量的负效应。由此可见,燕麦与豌豆隔行间作种植并添加尿素50 kg·hm-2(低氮)能显著促进禾豆间作体系氮素吸收能力并实现人工草地产量增加目标,成为高寒区人工草地产量提升的关键栽培技术。

关键词: 燕麦, 豌豆, 间作, 氮添加, 氮素吸收

Abstract:

Oats intercropped with peas has been regarded as an important method to improve the productivity of artificial grassland. Similarly, nitrogen fertilization is also recommended as an effective cultivation practice in increasing forage productivity for artificial grasslands. However, few studies have examined the interactive effects of different intercropping planting patterns and nitrogen addition levels on forage yields and the capacity for nitrogen absorption in oat-pea intercropping systems. A field experiment was carried out to examine the role of different intercropping patterns (monocropping, mixed monocropping, alternate-row intercropping) and nitrogen addition (control, low and high level) in improving forage biomass and increasing nitrogen uptake within intercropping systems comprising oats and peas. Our results showed 1) Both above- and belowground biomass of oats was highest when oats were intercropped with peas in an alternate-row pattern. Conversely, oat above- and belowground biomass was minimum when peas and oats were combined in a mixed intercropping system. Furthermore, both oat leaves and stem and oat root total nitrogen content and soil available nitrogen content were significantly increased when oats were intercropped with peas, while root nitrogen and soil available nitrogen contents of peas were lowest when peas were cultivated as a monocrop. 2) Root total nitrogen contents of oats and peas when monocropped were significantly higher than in the counterpart plants in alternate-row intercropped plantings. By contrast, soil NH4+-N and NO3--N contents of oats and peas in mixed intercropped plantings were markedly higher than those in monocropped and alternate-row intercropped systems. 3) Structural equation model (SEM) results indicated that intercropping and nitrogen addition both had a positive effect on oat biomass accumulation and enhanced nitrogen absorption in leaves, stems and soil, while resulting in negative effects on pea biomass and nitrogen contents in aboveground tissues and soil. In conclusion, the forage productivity of artificial grasslands in alpine regions achieves maximum productivity when exploiting the interactive effects of oat alternate-row intercropping with peas, with the addition of a low amount of nitrogen fertilizer (50 kg·ha-1). Our findings suggest that grass intercropping with legumes together with modest exogenous nitrogen addition is an ideal cultivation practice to enhance the productivity of artificial grassland in alpine regions.

Key words: oats, pea, intercropping, nitrogen addition, nitrogen absorption