草地学报 ›› 2025, Vol. 33 ›› Issue (4): 1211-1217.DOI: 10.11733/j.issn.1007-0435.2025.04.021

• 研究论文 • 上一篇    

短期氮添加下CO2浓度升高对蒙古冰草生长的影响

许爱云1, 秦一彤1, 张原红1, 李甜1, 曹兵2,3   

  1. 1. 陇东学院农业与生物工程学院, 甘肃 庆阳 745000;
    2. 宁夏大学林业与草业学院, 宁夏 银川 750021;
    3. 宁夏葡萄酒与防沙治沙职业技术学院, 宁夏 银川 750100
  • 收稿日期:2024-06-20 修回日期:2024-08-24 发布日期:2025-04-28
  • 通讯作者: 许爱云,E-mail:xaynxu@163.com
  • 作者简介:许爱云(1994-),女,汉族,甘肃环县人,博士,讲师,主要从事草地生态恢复、牧草生理生态及栽培利用研究,E-mail:xaynxu@163.com
  • 基金资助:
    甘肃省教育厅创新基金项目(2024B-170);陇东学院博士基金项目(XYBYZK2401)资助

Effects of Elevated CO2 Concentration on the Growth of Agropyron mongolicum Under Short-Term Nitrogen Addition Scenario

XU Ai-yun1, QIN Yi-tong1, ZHANG Yuan-hong1, LI Tian1, CAO Bing2,3   

  1. 1. School of Agriculture and Bioengineering, Longdong University, Qingyang, Gansu Province 745000, China;
    2. College of Forestry and Prataculture, Ningxia University, Yinchuan, Ningxia 750021, China;
    3. Ningxia Technical College of Wine and Desertification Prevention, Yinchuan, Ningxia 750100, China
  • Received:2024-06-20 Revised:2024-08-24 Published:2025-04-28

摘要: 大气CO2浓度升高会增加植物生物量,对植物具有明显的“施肥效应”,且该效应依赖于氮素有效性。本研究通过设置CK(0 g·m-2·a-1),N1.2(1.2 g·m-2·a-1),N3.6(3.6 g·m-2·a-1)和N10.8(10.8 g·m-2·a-1)4个氮添加水平和2个CO2浓度[(400±20) μmol·mol-1和(800±20) μmol·mol-1)],探讨氮添加下CO2浓度升高对蒙古冰草(Agropyron mongolicum)生物量积累及其与生长速率关系的影响。结果表明:氮添加下CO2浓度升高后蒙古冰草叶宽、叶长、株高、分蘖数、地下、地上生物量及其相对生长速率显著增加(P<0.05),其中N3.6水平下,与环境CO2浓度相比,CO2浓度升高后蒙古冰草地上生物量显著增加了53.09%(P<0.05),叶宽、叶长和分蘖数相对生长速率分别显著增加了52.61%,34.97%和109.53%(P<0.05)。回归分析表明,地上生物量与叶宽、株高、分蘖数、地下生物量及叶宽、株高和分蘖相对生长速率呈显著线性正相关关系,且回归决定系数大于环境CO2浓度处理。可见,大气CO2浓度升高对植物生物量积累的“施肥效应”与植物生长特征及生长速率密切相关。

关键词: 氮添加, CO2浓度升高, 蒙古冰草, 相对生长速率, 生物量

Abstract: The increase of atmospheric CO2 concentration enhances plant biomass, exhibiting a significant “fertilization effect” that is dependent on nitrogen availability. Four nitrogen addition levels : CK (0 g·m-2·a-1), N1.2 (1.2 g·m-2·a-1), N3.6 (3.6 g·m-2·a-1), and N10.8 (10.8 g·m-2·a-1), combined with two CO2 concentrations [(400±20) μmol·mol-1, (800±20) μmol·mol-1)] were implemented to investigate the impacts of elevated CO2 concentration on biomass accumulation in Agropyron mongolicum and its relationship with growth rate. The results showed that the elevated CO2 significantly increased leaf width, leaf length, plant height, tiller number, aboveground and belowground biomass, and their relative growth rates in Agropyron mongolicum under nitrogen addition(P<0.05). Specifically, compared to ambient CO2 concentration, the elevated CO2 under the N3.6 treatment led to an increase in aboveground biomass, the relative growth rates of leaf width, leaf length, and tiller number by 53.09%, 52.61%, 34.97% and 109.53% (P<0.05), respectively. Regression analysis indicated a significant positive linear correlation under the elevated CO2 between aboveground biomass and leaf width, plant height, tiller number, belowground biomass, the relative growth rates of leaf width, plant height, and tiller number, with a higher coefficient of determination than under ambient CO2 conditions. These findings suggest that the “fertilization effect” of elevated atmospheric CO2 on plant biomass accumulation is closely related to plant growth characteristics and growth rates.

Key words: Nitrogen addition, Elevated CO2 concentration, Agropyron mongolicum, Relative growth rate, Biomass

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