img

官方微信

高级检索

中国沙漠 ›› 2026, Vol. 46 ›› Issue (2): 242-250.DOI: 10.7522/j.issn.1000-694X.2025.00163

• • 上一篇    

腾格里沙漠人工植被区柠条( Caragana korshinskii )水力结构特征及安全效率权衡

徐永武1(), 黄磊2(), 赵莹2   

  1. 1.甘肃省耕地质量建设保护总站,甘肃 兰州 730020
    2.宁夏大学 林业与草业学院,宁夏 银川 750021
  • 收稿日期:2025-09-25 修回日期:2025-10-21 出版日期:2026-03-20 发布日期:2026-04-13
  • 通讯作者: 黄磊
  • 作者简介:徐永武(1967—),男,甘肃景泰人,高级农艺师,主要从事干旱区生态学方面的研究。E-mail: 229527217@qq.com
  • 基金资助:
    宁夏回族自治区自然科学基金项目(2024AAC02027);宁夏回族自治区重点研发计划(引才专项)项目;宁夏留学回国人员创新项目

Hydraulic architecture and the safety-efficiency trade-off of Caragana korshinskii in the Tengger Desert

Yongwu Xu1(), Lei Huang2(), Ying Zhao2   

  1. 1.The General Station of Construction and Protection for the Cultivated Land Quality of Gansu Province,Lanzhou 730020,China
    2.School of Forestry and Grassland,Ningxia University,Yinchuan 750021,China
  • Received:2025-09-25 Revised:2025-10-21 Online:2026-03-20 Published:2026-04-13
  • Contact: Lei Huang

摘要:

水力结构及其安全效率权衡是植物适应干旱胁迫的重要水力学机制。为探究干旱荒漠人工植被演替过程中植物水力功能的变化规律,以腾格里沙漠东南缘不同建植年份(1956—2020年)的柠条(Caragana korshinskii)人工固沙植被为对象,系统测定边材比导率(Kₛ)、叶比导率(Kₗ)、导水率损失百分比(PLC)、胡伯尔值(Hv)及木质部栓塞脆弱性(P50,发生50%栓塞时的水势)等关键水力指标,并分析其变化趋势。结果表明:(1)柠条Kₛ和Kₗ随植被建植年限增加呈显著递减趋势,从2020年的3.8±0.2 kg·m⁻¹·s⁻¹·MPa⁻¹和5.2±0.25 kg·m⁻¹·s⁻¹·MPa⁻¹分别降至1956年的1.4±0.08 kg·m⁻¹·s⁻¹·MPa⁻¹和2.0±0.10 kg·m⁻¹·s⁻¹·MPa⁻¹;(2)柠条PLCP₅₀呈现先减少再增加的非线性变化模式,演替中期柠条植被表现出最强的栓塞抗性(PLC=48%±2.3%,P₅₀=-3.25 MPa);(3)柠条Hᵥ呈单峰分布,在1981年植被区达到峰值(15.5±0.72 cm²·mm⁻²);(4)柠条Kₛ、Kₗ与P₅₀呈显著正相关关系(P<0.05),证实存在水力效率-安全性权衡。研究结果揭示柠条水力功能策略从早期高效率-高风险向中期结构补偿-安全优先再到后期功能衰退的演替规律,为理解干旱区人工植被的水分适应机制和可持续管理提供重要的生理生态学依据。

关键词: 柠条, 水力导度, 栓塞脆弱性, 效率-安全性权衡

Abstract:

Hydraulic architecture represents the morphological strategies related to water transport that plants develop in response to environmental conditions. To investigate the age-related effects on hydraulic functions and the corresponding adaptation mechanisms of artificial vegetation in arid regions, we selectedCaragana korshinskii plantations established in different years (ranging from 1956 to 2020) on the southeastern edge of the Tengger Desert. Key hydraulic traits, including sapwood-specific hydraulic conductivity (Kₛ), leaf-specific hydraulic conductivity (Kₗ), percentage loss of conductivity (PLC), Huber value (Hᵥ), and xylem embolism vulnerability (P₅₀), were systematically measured. The results indicated that: (1) Both Kₛ and Kₗ exhibited a significant decreasing trend with increasing stand age, declining from 3.8±0.2 kg·m⁻¹·s⁻¹·MPa⁻¹ and 5.2±0.25 kg·m⁻¹·s⁻¹·MPa⁻¹, respectively, in the 2020 stand to 1.4±0.08 kg·m⁻¹·s⁻¹·MPa⁻¹ and 2.0±0.10 kg·m⁻¹·s⁻¹·MPa⁻¹ in the 1956 stand. (2) PLC and P50 followed a pattern of initially decreasing and then increasing, with the middle-aged stand (established in 1981) demonstrating the highest resistance to embolism (PLC=48%±2.3%; P50=-3.25 MPa). (3) The Huber value (Hᵥ) exhibited a unimodal distribution, peaking at 15.5±0.72 cm²·mm⁻² in the 1981 stand, which suggests that middle-aged plants mitigate the decline in hydraulic efficiency via structural compensation. (4) A significant positive correlation was found between Kₛ and P50r=0.817, P<0.05), confirming the existence of the hydraulic efficiency-safety trade-off. This study reveals a successional pattern in the hydraulic strategy of C. korshinskii, shifting from a high efficiency-high risk approach in the early stage, to a structural compensation-safety priority strategy in the middle stage, and finally to functional decline in the senescent stage. These findings provide a crucial physio-ecological basis for understanding the water adaptation mechanisms of artificial vegetation in arid regions and for their sustainable management.

Key words: Caragana korshinskii, hydraulic conductivity, embolism vulnerability, efficiency-safety trade-off

中图分类号: