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草业学报 ›› 2025, Vol. 34 ›› Issue (9): 87-96.DOI: 10.11686/cyxb2024393

• 研究论文 • 上一篇    下一篇

干旱胁迫对珍珠猪毛菜水力特征的影响

张兴隆(), 单立山(), 王红永, 解婷婷, 马静   

  1. 甘肃农业大学林学院,甘肃 兰州 730070
  • 收稿日期:2024-10-12 修回日期:2024-12-25 出版日期:2025-09-20 发布日期:2025-07-02
  • 通讯作者: 单立山
  • 作者简介:E-mail: shanls@gsau.edu.cn
    张兴隆(1995-),男,甘肃临夏人,在读硕士。E-mail: zhangxingl@st.gsau.edu.cn
  • 基金资助:
    国家自然科学基金(32160253);国家自然科学基金(U23A2061);甘肃省重点研发计划项目(22YF7FA117);甘肃省科技重大专项计划(22ZD6FA052)

Effect of drought stress on the hydraulic traits of Salsola passerina

Xing-long ZHANG(), Li-shan SHAN(), Hong-yong WANG, Ting-ting XIE, Jing MA   

  1. College of Forestry,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2024-10-12 Revised:2024-12-25 Online:2025-09-20 Published:2025-07-02
  • Contact: Li-shan SHAN

摘要:

水分是干旱区植物生存和生长的主要限制因子,可利用土壤水分的降低直接影响植物的水分运输能力和栓塞抗性。但是在干旱胁迫下荒漠植物水力性状动态变化特征的相关研究仍不清晰。因此,本研究以干旱、半干旱地区优势种和建群种珍珠猪毛菜为研究对象,设置对照组(充分供水)和干旱处理(不浇水),测定干旱胁迫至不同时间珍珠猪毛菜的水力参数。结果表明:1)随干旱胁迫时间增加,珍珠猪毛菜的叶比导率显著降低,栓塞抗性显著增加,水力安全边界显著降低,边材比导率无显著差异;2)与对照相比,干旱处理的珍珠猪毛菜水分调节对策更趋向于变水行为;3)干旱处理的珍珠猪毛菜栓塞抗性和水分运输效率之间解耦;4)水力安全边界和边材比导率是珍珠猪毛菜响应干旱胁迫的主要性状,可通过调控以上指标来适应土壤水分变化。总之,珍珠猪毛菜的水力性状受干旱胁迫影响显著,干旱胁迫下以栓塞抗性为代价维持较高的水分运输效率,但存在较高的水力风险。

关键词: 干旱胁迫, 珍珠猪毛菜, 水力性状, 水力效率-安全权衡, 水力策略

Abstract:

Moisture is a major limiting factor for plant survival and growth in arid zones, and reductions in available soil moisture directly affect the water transport capacity and embolism vulnerability of plants. Nevertheless, related studies on the dynamic change characteristics of hydraulic traits in desert plants under drought stress are still unclear. Therefore, in this research Salsola passerine, a dominant species in arid, semi-arid regions, was studied. Control (sufficient water supply) and drought treatments (no watering) were set up to determine the hydraulic parameters of S. passerina subjected to drought stress to different growth stages. The results demonstrated that, with increase in drought stress duration: 1) the leaf specific hydraulic conductivity of S. passerina exhibited a notable decline, embolism vulnerability notably increased, and the hydraulic safety boundary showed a significant decline, while sapwood-specific hydraulic conductivity did not differ significantly between control and drought treatments; 2) the water regulation responses of S. passerina subjected to drought stress exhibited a proclivity towards water-variable behavior, in comparison to the control; 3) decoupling between embolism resistance and water transport efficiency of drought-treated S. passerina; 4) hydraulic safety boundary and sapwood-specific hydraulic conductivity are the main adaptive traits of S. passerina in response to drought stress. Furthermore, these responses can be modulated to adapt to soil moisture changes. In conclusion, the hydraulic traits of S. passerina were significantly modified by drought stress, with higher water transport efficiency maintained at the cost of embolism vulnerability under drought stress. Thus, higher hydraulic risk exists.

Key words: drought stress, Salsola passerina, hydraulic traits, hydraulic efficiency-safety trade-off, hydraulic strategies