欢迎访问《应用生态学报》官方网站,今天是 分享到:

应用生态学报 ›› 2022, Vol. 33 ›› Issue (9): 2331-2338.doi: 10.13287/j.1001-9332.202209.004

• • 上一篇    下一篇

遮阴和干旱对白桦幼苗光诱导的气孔动力学影响

赵霖玉1, 李秧秧2*   

  1. 1 西北农林科技大学林学院, 陕西杨凌 712100;
    2西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100
  • 收稿日期:2022-01-18 接受日期:2022-05-16 出版日期:2022-09-15 发布日期:2023-03-15
  • 通讯作者: * E-mail: yyli@ms.iswc.ac.cn
  • 作者简介:赵霖玉, 女, 1997年生, 硕士研究生。主要从事植物水分生理生态研究。E-mail: zly180625@126.com
  • 基金资助:
    中国科学院战略性先导科技专项(B类)(XDB20020202)资助。

Effects of shading and drought on light-induced stomatal dynamics in Betula platyphylla seedlings

ZHAO Lin-yu1, LI Yang-yang2*   

  1. 1College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China;
    2State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2022-01-18 Accepted:2022-05-16 Online:2022-09-15 Published:2023-03-15

摘要: 以黄土丘陵区演替早期种白桦的幼龄实生苗为材料,采用全光照和遮阴(光照为全光照的30%)以及正常水分(田间持水量的75%~80%)和干旱(田间持水量的40%~45%)处理,研究了遮阴和干旱下白桦幼苗光诱导的气孔动力学参数、气孔解剖特征、整株植物生长和水分利用的变化。结果表明: 遮阴使气孔开放过程的滞后时间和响应时间显著增加0.8和1.8倍,气孔开放和关闭过程的响应速度显著降低82.2%和65.0%,气孔开放和关闭过程的响应幅度显著降低43.3%和56.9%;干旱使气孔开放过程的响应幅度显著降低43.9%、气孔关闭过程的响应速度显著降低33.0%;二者仅对气孔开放过程的滞后时间存在交互作用。白桦幼苗气孔关闭过程的响应速度与气孔密度和气孔指数呈显著正相关,其他气孔动力学参数与气孔解剖结构间无显著相关性。白桦气孔关闭过程中的响应速度与整株生物量、耗水量呈显著正相关,所有气孔动力学参数和整株水分利用效率间无显著相关性。遮阴和干旱对白桦光诱导的气孔动力学参数的影响与其对气孔解剖结构的影响有关,动态光下的气孔动力学参数可在一定程度上阐释白桦不同生境下生长的差异。

关键词: 白桦, 遮阴, 干旱, 气孔导度动力学, 水分利用

Abstract: Two factors-two levels experiment (full light and shading, the irradiance in the shading was 30% of the full light; normal water and drought, where soil moisture was maintained at 75%-80% and 40%-45% of field capacity, respectively) was conducted to study the variation of light-induced stomatal dynamics, stomatal traits, whole plant growth and water use under shading and drought for the early succession stage species Betula platyphylla seedlings in the hilly area of the Loess Plateau. Results showed that shading significantly increased lag and response time by 0.8 and 1.8 times during stomatal opening, decreased response speed significantly by 82.2% and 65.0%, and response amplitude by 43.3% and 56.9% during stomatal opening and closing, respectively. Drought significantly reduced response amplitude by 43.9% during stomatal opening and response speed by 33.0% during stomatal closing. The interaction of shading and drought only affected lag time during stomatal opening. The response speed during stomatal closing was significantly positively correlated with stomatal density and stomatal index. There was no significant correlation between other stomatal dynamic parameters and stomatal anatomical structure. Response speed during stomatal closing was positively correlated with whole plant biomass and water consumption, and there was no correlation between stomatal dynamics parameters and water use efficiency. The results showed that the effects of shading and drought on light-induced stomatal dynamics were partly attributed to the alteration of stomata anatomical structure, and that the light-induced stomatal dynamic parameters could partly explain the alterations of B. platyphylla growth under different habitats.

Key words: Betula platyphylla, shading, drought, stomatal conductance dynamics, water use