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中国沙漠 ›› 2025, Vol. 45 ›› Issue (3): 271-282.DOI: 10.7522/j.issn.1000-694X.2025.00063

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土壤水分与氮含量对宁夏荒漠草原甘肃蒿( Artemisia gansuensis )、胡枝子( Lespedeza bicolor )、针茅( Stipa capillata )生理的影响

丁甲1(), 唐逸云1, 李蕾1, 杨宏玉1, 张泽琦1, 王君1, 余舒畅1, 冯金朝1, 石莎1(), 杨昊天2   

  1. 1.中央民族大学 生命与环境科学学院,北京 100081
    2.中国科学院西北生态环境资源研究院 沙坡头沙漠研究试验站,甘肃 兰州 730000
  • 收稿日期:2025-03-21 修回日期:2025-05-06 出版日期:2025-05-20 发布日期:2025-06-30
  • 通讯作者: 石莎
  • 作者简介:丁甲(2001—),男,宁夏吴忠人,硕士研究生,主要从事植物生态学研究。E-mail: 23302585@muc.edu.cn
  • 基金资助:
    国家自然科学基金项目(31570407);宁夏回族自治区农业科技自主创新资金项目(NGSB-2021-14-04);农业遗产保护与利用项目(2021XSTD02);中央民族大学2023年度“道中华”专项建设项目(104-0220050329)

Effects of soil water and nitrogen content on Artemisia gansuensisLespedeza bicolor and Stipa capillata in the Ningxia Desert Steppe

Jia Ding1(), Yiyun Tang1, Lei Li1, Hongyu Yang1, Zeqi Zhang1, Jun Wang1, Shuchang Yu1, Jinchao Feng1, Sha Shi1(), Haotian Yang2   

  1. 1.College of Life and Environmental Sciences,Minzu University of China,Beijing 100081,China
    2.Shapotou Desert Research and Experiment Station,Northwest Institute of Eco-Environment and Resources,Lanzhou 730000,China
  • Received:2025-03-21 Revised:2025-05-06 Online:2025-05-20 Published:2025-06-30
  • Contact: Sha Shi

摘要:

甘肃蒿(Artemisia gansuensis)、胡枝子(Lespedeza bicolor)、针茅(Stipacapillata)是宁夏荒漠草原典型植物,具有重要的生态功能。在干旱加剧、氮沉降等环境条件下,荒漠草原植物的生理响应机制尚不明确。本研究通过野外控制实验,设置不同水、氮条件,分析荒漠草原3种植物光合作用与蒸腾特性的生理响应机制。结果表明:(1)甘肃蒿对环境水分变化的响应较为敏感,胡枝子对水分胁迫有着相对较高的适应性,3种植物通过不同模式的气孔调节行为适应环境水分变化;(2)适宜的氮素添加能够优化甘肃蒿的光合系统,增加其光合效率;(3)氮沉降对胡枝子产生较大影响,过多的氮素添加会导致胡枝子在群落中的竞争能力下降;(4)针茅面对环境氮素的改变反应甚微,对氮素利用表现出高度的保守策略。

关键词: 生理响应, 氮添加, 光合作用, 荒漠植物, 梯度水分控制

Abstract:

Artemisia gansuensisLespedeza bicolor, and Stipa capillata are three typical native plant species in the Ningxia desert steppe, playing significant ecological roles. However, their physiological response mechanisms under environmental stressors such as intensified drought and nitrogen deposition remain unclear. This study conducted field-controlled experiments to investigate the physiological responses and adaptive strategies of these desert steppe plants by analyzing their photosynthetic and transpiration characteristics under varying water and nitrogen conditions. The results indicate that: (1) Artemisia gansuensis exhibits high sensitivity to changes in water availability, while Lespedeza bicolor demonstrates relatively higher adaptability to water stress. All three species adapt to water variability through distinct stomatal regulation strategies; (2) Appropriate nitrogen addition optimizes the photosynthetic system of Artemisia gansuensis, enhancing its photosynthetic efficiency; (3) Nitrogen deposition significantly affects Lespedeza bicolor, with excessive nitrogen addition reducing its competitive ability within the plant community; (4) Stipa capillata shows minimal response to changes in nitrogen availability, adopting a highly conservative nitrogen utilization strategy. This study provides insights into the physiological responses and adaptation mechanisms of Artemisia gansuensisLespedeza bicolor, and Stipa capillata under water and nitrogen gradients, offering a scientific basis for further research on desert steppe plants and their conservation and restoration.

Key words: physiological response, nitrogen addition, photosynthesis, desert plants, graded water treatment

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