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中国沙漠 ›› 2024, Vol. 44 ›› Issue (2): 90-98.DOI: 10.7522/j.issn.1000-694X.2023.00085

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毛乌素沙地不同龄级黑沙蒿( Artemisia ordosica )枝叶功能性状对干旱的响应

张建玲1(), 于明含1(), 孙慧媛1, 何莹莹2, 张富崇1   

  1. 1.北京林业大学 水土保持国家林业和草原局重点实验室/林业生态工程教育部工程研究中心/宁夏盐池毛乌素沙地生态系统国家定位观测研究站,北京 100083
    2.宁夏大学 林业与草业学院,宁夏 银川 750021
  • 收稿日期:2023-07-11 修回日期:2023-09-11 出版日期:2024-03-20 发布日期:2024-03-19
  • 通讯作者: 于明含
  • 作者简介:于明含(E-mail: ymh_2012tai@163.com
    张建玲(1999—),女,云南建水人,硕士研究生,主要研究方向为荒漠植被生理生态。E-mail: zjl15887231204@163.com
  • 基金资助:
    国家自然科学基金项目(31700639);国家重点研发计划项目(2019YFC0507601);省部级项目(632301012)

Response of functional characters of Artemisia ordosica at different ages to drought in Mu Us Sandy Land

Jianling Zhang1(), Minghan Yu1(), Huiyuan Sun1, Yingying He2, Fuchong Zhang1   

  1. 1.Key Laboratory of State Forestry Administration on Soil and Water Conservation / MOE Engineering Research Center of Forestry Ecological Engineering / Yanchi Ecology Research Station of the Mu Us Desert,Beijing Forestry University,Beijing 100083,China
    2.College of Forestry and Prataculture,Ningxia University,Yinchuan 750021,China
  • Received:2023-07-11 Revised:2023-09-11 Online:2024-03-20 Published:2024-03-19
  • Contact: Minghan Yu

摘要:

探究荒漠植物枝叶性状对干旱胁迫的响应及龄级差异,可以为理解由降水模式变化所引起的极端干旱下荒漠植物适应性和预测荒漠植被演替趋势提供理论依据。本研究以荒漠地区典型沙生植物黑沙蒿(Artemisia ordosica)为研究对象,通过野外降水控制试验,设置4个降雨梯度(自然降雨量和30%、50%、70%降雨量)模拟黑沙蒿轻度、中度、极端干旱的生长环境;以形态学特征为龄级划分依据,对不同龄级黑沙蒿主要的枝叶性状进行研究。结果表明:(1)黑沙蒿通过增加叶片厚度、减少小枝叶片数量、增大小枝横截面积、减短小枝长度、增大胡伯尔值等多种功能性状的调节以响应不同程度的干旱胁迫。(2)不同龄级植株在枝叶功能性状中具有天然的差异性,高龄级黑沙蒿的叶片厚度、小枝叶片总面积、叶片数量、小枝长度、小枝横截面积等功能性状均显著高于低龄级个体。(3)不同龄级黑沙蒿在应对降水变化时具有差异响应,低龄级黑沙蒿在逆境中主要调节比叶面积、小枝叶片总面积、出叶强度功能性状。随着龄级的增加,黑沙蒿主要调节的功能性状为胡伯尔值,通过提升小枝向叶片供水的潜力增加其抗旱能力。

关键词: 黑沙蒿(Artemisia ordosica), 龄级, 干旱胁迫, 比叶面积, 胡伯尔值

Abstract:

The purpose of this study was to explore the response and age class differences of desert plant of twig and leaf functional traits to drought stress, and to provide theoretical basis for understanding the adaptability of desert plants under extreme drought caused by changes in precipitation patterns and predicting the succession trend of desert plant. In this study, Artemisia ordosica, a typical sand plant in desert areas, was selected as the research object. There were four rainfall gradients, including a control and rainfall reductions of 30%, 50% and 70%, each with three replications. The growth environment of mild, moderate and extreme drought was simulated. On the basis of morphological characteristics, the main twig and leaf functional trait in different age class were studied. Results showed that: (1) A. ordosica could respond to drought stress by increasing leaf thickness, reducing the leaf number, increasing the twig cross-sectional area, reducing the twig length and increasing huber value. (2) Plants of different ages had natural differences in functional traits of twig and leaf. The leaf thickness, total leaf area, leaf number, twig cross-sectional area and twig length were significantly higher in older plants than in younger class. (3) A. ordosica has different responses to precipitation changes in different age class, and low-age A. ordosica mainly regulates specific leaf area, total leaf area, and leafing intensity under adversity. With the increase of age grade, the main regulating functional trait of A. ordosica was the huber value, and the drought resistance of A. ordosica was increased by increasing the potential of water supply from twigs to leaves.

Key words: Artemisia ordosica, age class, drought stress, specific leaf area, huber value

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