16种苏铁属植物叶片的水力学特征（附录）

吴虹佳<sup>1</sup>; 王阳艳<sup>1</sup>; 杨泉光<sup>2</sup>; 朱师丹<sup>1*</sup>

引用本文:	吴虹佳, 王阳艳, 杨泉光, 朱师丹.16种苏铁属植物叶片的水力学特征（附录）[J].广西植物,2025,45(6):1175-1185.[点击复制]
	WU Hongjia, WANG Yangyan, YANG Quanguang, ZHU Shidan.Leaf hydraulic characteristics of 16 Cycas species[J].Guihaia,2025,45(6):1175-1185.[点击复制]

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16种苏铁属植物叶片的水力学特征（附录）
吴虹佳¹, 王阳艳¹, 杨泉光², 朱师丹^1*
1. 广西大学林学院, 广西森林生态与保育重点实验室, 广西高校亚热带人工林培育与利用重点实验室, 南宁 530004;2. 南宁植物园,南宁青秀山风景名胜旅游开发有限责任公司, 南宁 530029

摘要:

我国苏铁类植物主要分布在热带和亚热带地区不同生境中,绝大部分处于濒危状态。研究苏铁植物叶片(羽片)水力学性状有助于了解其对水分环境的适应及对气候变化的响应机制。该研究以南宁植物园苏铁专类园中原产于我国的16种苏铁属植物为研究对象,测定叶片形态解剖特征、压力-容积曲线、导水率和抗栓塞能力等指标,同时收集同区域被子植物的叶片性状进行对比分析。结果表明:(1)16种苏铁属植物水力学性状的种间变异较小,并且分布于喀斯特和非喀斯特生境的2个类群的水力性状无显著性差异。(2)与被子植物相比,苏铁植物叶片最大导水率(K_leaf-max)较高、抗栓塞能力(P_50leaf)较弱、气孔安全边界HSM_tlp较小,趋于采取冒险的气孔调节策略。(3)与被子植物不同,苏铁属植物K_leaf-max和P_50leaf之间无显著权衡关系,部分原因在于苏铁属植物的叶水力学性状受解剖结构影响较小。该研究揭示了苏铁植物的水力策略,认为苏铁属植物叶片的水力风险较高,亟须对自然分布种群进行水分生理监测以提高保护管理能力。

关键词: 热带亚热带, 解剖结构, 水力学性状, 苏铁属, 生境

DOI：10.11931/guihaia.gxzw202407006

分类号:Q945

文章编号:1000-3142(2025)06-1175-11

基金项目:广西自然科学基金(2023GXNSFFA026008); 青秀山管委会科学研究项目(QXS2021-05)。

Leaf hydraulic characteristics of 16 Cycas species

WU Hongjia¹, WANG Yangyan¹, YANG Quanguang², ZHU Shidan^1*

1. Guangxi Key Laboratory of Forest Ecology and Conservation, Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation, College of Forestry, Guangxi University, Nanning 530004, China;2. Nanning Botanical Garden, Nanning Qingxiu Mountain Scenic Spots Tourism Development Co., Ltd., Nanning 530029, China 1. Guangxi Key Laboratory of Forest Ecology and Conservation, Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation, College of Forestry, Guangxi University, Nanning 530004, China; 2. Nanning Botanical Garden, Nanning Qingxiu Mountain Scenic Spots Tourism Development Co., Ltd., Nanning 530029, China

Abstract:

Cycads of China are mainly distributed across diverse habitats in tropical and subtropical regions, with most species are highly endangered. The study of leaf hydraulic traits in cycads species enhances our understanding of their adaptation to the water environments and responses to climate change. We selected 16 native Cycas species from Nanning Botanical Garden and measured leaf morphological and anatomical characteristics, pressure-volume curves, hydraulic conductance, and cavitation resistance. Additionally, we collected leaf traits of tropical-subtropical angiosperms from the same region for comparative analysis. The results were as follows:(1)There was slight interspecific variation in hydraulic traits across the 16 Cycas species, and no significant differences were found in hydraulic traits between the two groups distributed in karst and non-karst.(2)Compared to angiosperms, Cycas species showed higher leaf maximum hydraulic conductance(K_leaf-max), lower cavitation resistance(P_50leaf), and smaller stomatal safety margin(HSM_tlp), tend to adopt a risky stomatal regulation strategy.(3)Different from angiosperms, we found a no significant trade-off between K_leaf-max and P_50leaf in Cycas species, which partly due to the fact leaf hydraulic traits of Cycas were less influenced by anatomical structure. This study reveals the hydraulic strategies of Cycas species, illustrates the high leaf hydraulic risk of Cycas, and recommends monitoring water relations of their field populations to improve the level of conservation.

Key words: tropical and subtropical, anatomical structure, hydraulic traits, Cycas, habitat