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中国沙漠 ›› 2026, Vol. 46 ›› Issue (3): 120-130.DOI: 10.7522/j.issn.1000-694X.2025.00111

• • 上一篇    

河西走廊荒漠区典型C3C4 荒漠灌木对模拟增温的响应

罗维成1(), 赵文智1(), 任珩1, 郭彬2, 安宁1,3, 刘冰1, 刘佳艺1,3   

  1. 1.中国科学院西北生态环境资源研究院 临泽内陆河流域研究站/国家林业和草原局山水林田湖草沙系统治理重点实验室/干旱区生态安全与可持续发展全国重点实验室,甘肃 兰州 730000
    2.甘肃农业大学 林学院,甘肃 兰州 730070
    3.中国科学院大学,北京 100049
  • 收稿日期:2025-04-08 修回日期:2025-05-06 出版日期:2026-05-20 发布日期:2026-06-11
  • 通讯作者: 赵文智
  • 作者简介:罗维成(1987—),男,甘肃靖远人,理学博士,副研究员,研究方向为荒漠植物生态学。E-mail: luoweicheng@lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(42230720);国家自然科学基金项目(42177457);中国科学院“西部之光”青年学者项目

Responses of typical C3 and C4 desert shrubs to simulated warming in Hexi Corridor

Weicheng Luo1(), Wenzhi Zhao1(), Heng Ren1, Bin Guo2, Ning An1,3, Bing Liu1, Jiayi Liu1,3   

  1. 1.Linze Inland River Basin Research Station / Key Laboratory of State Forestry and Grassland Administration on“Mountain-River-Forest-Farmland-Lake-Grassland-Desert System Governance / State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.College of Forestry,Gansu Agricultural University,Lanzhou 730070,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2025-04-08 Revised:2025-05-06 Online:2026-05-20 Published:2026-06-11
  • Contact: Wenzhi Zhao

摘要:

全球气候变暖给荒漠生态系统带来巨大影响,也给荒漠固沙稳定性维持及可持续性管理带来新的挑战。本研究利用开顶箱(Open-top chamber, OTC)模拟增温装置研究增温对典型荒漠固沙植物泡泡刺(Nitraria sphaerocarpa,C3植物)和梭梭(Haloxylon ammodendron,C4植物)光合生理及化学计量元素含量的影响。结果表明:(1)不同植物光合指标对增温的响应明显不同,不同增温幅度(ΔT)下,泡泡刺净光合作用速率(Pn)和水分利用效率(WUE)均显著低于梭梭;泡泡刺Pn和ΔT间为显著的线性关系,而梭梭Pn与ΔT呈二次曲线关系;泡泡刺WUE随着ΔT的增加而增加,而梭梭先降低后增大。(2)增温也对两种植物叶片C、N和P含量有显著影响,两种植物叶片C、N和P含量均随ΔT的增加而增大,但泡泡刺C、N和P含量高于梭梭。(3)ΔT和泡泡刺光合指标呈显著正相关,而和叶片C、N、P含量呈负相关关系;ΔT和梭梭Pn显著正相关,但和WUE显著负相关,且和叶片C、P含量也呈正相关关系。这说明两种荒漠植物对高温都有很强的适应能力,C3植物泡泡刺通过增加叶片C、N和P的累积来应对高温胁迫,呈现出“高储存-高防御”的适应策略;而C4植物梭梭通过增加C、N和P的消耗来加速生长,呈现出“快速生长-高效利用”的适应策略。总之,C3植物和C4植物光合指标和叶片化学计量元素含量对增温的响应截然不同。以上结果对于深入理解气候变化对荒漠植物生长发育的调控具有重要意义,同时也为干旱区人工固沙植被的稳定性维持及科学性管理提供了科学支撑。

关键词: C3植物, 泡泡刺(Nitraria sphaerocarpa), C4植物, 梭梭(Haloxylon ammodendron), 模拟增温, 光合生理, 化学计量元素.

Abstract:

Global warming has brought great impact on desert ecosystems, and also brought new challenges to the establishment and management of desert sand-fixation vegetation. This study investigated the effects of varying degrees of warming on the photosynthetic physiology and stoichiometric element content of two typical desert sand-fixing plants—Nitraria sphaerocarpa (a C3 plant) and Haloxylon ammodendron (a C4 plant)—using Open-top chambers (OTCs) as warming simulation devices. The results showed that: (1) The photosynthetic responses of the two plants to warming differed significantly. Under different warming magnitudes (ΔT), N. sphaerocarpa exhibited significantly lower net photosynthetic rate (Pn) and water use efficiency (WUE) than H. ammodendron. The Pn of N. sphaerocarpa showed a linear relationship with ΔT, while that of H. ammodendron followed a quadratic relationship. The WUE of N. sphaerocarpa increased with ΔT, whereas that of H. ammodendron first decreased and then increased. (2) Warming also significantly affected the leaf C, N, and P contents of two plants. The C, N, and P contents of both species increased with ΔT, but N. sphaerocarpa had higher levels than H. ammodendron. (3) ΔT was positively correlated with the photosynthetic parameters of N. sphaerocarpa but negatively correlated with its leaf C, N, and P contents. In contrast, ΔT was positively correlated with the Pn of H. ammodendron but negatively correlated with its WUE, while showing a positive correlation with its leaf C and P contents. These findings indicate that both desert plants exhibit strong adaptability to warming through different strategies: The C3 plant N. sphaerocarpa adopts a "high storage-high defense" strategy by increasing leaf C, N, and P contents to enhance photosynthetic capacity under thermal stress. The C4 plant H. ammodendron employs a "fast growth-efficient utilization" strategy by accelerating growth through increased consumption of C, N, and P. In summary, the responses of photosynthetic traits and leaf stoichiometric element contents to warming were markedly different between the C3 plant N. sphaerocarpa and the C4 plant H. ammodendron. These results provide important insights into how climate change regulates the growth and development of desert plants and provides scientific support for the stability maintenance and scientific management of artificial sand-fixing vegetation in arid desert areas.

Key words: C3 plant, Nitraria sphaerocarpa, C4 plant, Haloxylon ammodendron, simulated warming, photosynthetic traits, stoichiometric element content

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