干旱区研究 ›› 2023, Vol. 40 ›› Issue (2): 257-267.doi: 10.13866/j.azr.2023.02.10
徐梦琦1,2,3,4(),高艳菊1,2,3,4,张志浩1,2,3,黄彩变1,2,3,曾凡江1,2,3,4(
)
收稿日期:
2022-07-27
修回日期:
2022-10-06
出版日期:
2023-02-15
发布日期:
2023-03-08
通讯作者:
曾凡江
作者简介:
徐梦琦(1997-),女,硕士研究生,主要从事荒漠植物生理生态研究. E-mail: 基金资助:
XU Mengqi1,2,3,4(),GAO Yanju1,2,3,4,ZHANG Zhihao1,2,3,HUANG Caibian1,2,3,ZENG Fanjiang1,2,3,4(
)
Received:
2022-07-27
Revised:
2022-10-06
Online:
2023-02-15
Published:
2023-03-08
Contact:
Fanjiang ZENG
摘要:
叶片和根系能通过形态、生理和生物量累积的变化响应干旱胁迫。以策勒绿洲-沙漠过渡带的优势植物疏叶骆驼刺(Alhagi sparsifolia Shap.)为研究对象,通过盆栽试验模拟3种水分条件(充分灌溉CK:土壤含水量占最大田间持水量的70%~75%;轻度胁迫W1:田间持水量的50%~55%;重度胁迫W2:田间持水量的25%~30%),分析一年生骆驼刺幼苗叶片和根系生长、生理的变化特征,揭示骆驼刺对干旱胁迫的适应策略。结果表明:(1) 干旱显著抑制骆驼刺地上和地下各器官生长,主要表现为:叶面积、根长、根表面积、根组织密度以及叶和根的可溶性糖含量显著减小(P<0.05);叶组织密度、叶干物质含量、比根长以及叶和根的脯氨酸、丙二醛含量增大。(2) 生长前期,各处理地上生物量均占比较大(CK、W1、W2下根冠比分别为0.43±0.14、0.59±0.1、0.83±0.83);而生长后期各处理地下生物量占比较大,其中重度胁迫下根冠比最大(3.12±0.32),表明骆驼刺在生长后期增强了地下部分的资源投入,且这种资源分配特征在重度干旱胁迫下更明显。(3) Pearson相关性分析表明,骆驼刺叶形态与根生理相关的核心性状存在显著的权衡关系(P<0.05),同时叶与根在生理代谢上能够协同变化。初步说明,骆驼刺幼苗在干旱下表现出干物质储存和防御能力高、水分消耗低的适应特征,能够协调叶片和根系的资源分配关系,随胁迫时间的增加逐步形成缓慢投资、保守生长的策略。该结果为该区域荒漠植被恢复和管理提供参考。
徐梦琦,高艳菊,张志浩,黄彩变,曾凡江. 干旱胁迫对疏叶骆驼刺幼苗生长和生理的影响[J]. 干旱区研究, 2023, 40(2): 257-267.
XU Mengqi,GAO Yanju,ZHANG Zhihao,HUANG Caibian,ZENG Fanjiang. Effects of drought stress on growth and physiology of Alhagi sparsifolia seedlings[J]. Arid Zone Research, 2023, 40(2): 257-267.
表1
干旱胁迫下骆驼刺的生物量累积"
生长时期 | 水分处理 | 叶生物量 | 地上生物量 | 地下生物量 | 根冠比 |
---|---|---|---|---|---|
生长前期 | CK | 8.34±1.31a | 17.71±3.81a | 7.21±1.23a | 0.43±0.14b |
W1 | 4.23±0.76b | 9.05±1.41b | 5.23±0.13ab | 0.59±0.10ab | |
W2 | 1.57±0.01c | 4.59±0.88b | 3.90±1.63b | 0.83±0.24a | |
生长后期 | CK | 4.30±1.16a | 10.45±2.62a | 24.74±8.24a | 2.33±0.32b |
W1 | 2.70±0.15b | 6.65±0.69b | 15.82±1.12a | 2.39±0.12b | |
W2 | 0.67±0.30c | 1.76±0.43c | 5.44±0.99b | 3.12±0.32a |
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