16种苏铁属植物叶片的水力学特征
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中图分类号：Q945 文献标识码：A 文章编号：1000-3142（2025）06-1175-11
Leaf hydraulic characteristics of 16 Cycas species
WU Hongjia'，WANG Yangyan1，YANG Quanguang²，ZHU Shidan （1.GuangxiKbatofstoodCseaogilsdUestKbotoiaodt ofSubtropicalorestPlatation，ColegeofForestryGuangxiUiversity，Naing30o，hina;2.NaningBotaicalGaden， Nanning Qingxiu Mountain Scenic Spots Tourism Development Co.，Ltd.，Nanning 53O029，China）
Abstract：Cycads ofChina are mainlydistributedacrossdiverse habitats in tropicaland subtropical regions，withmost species are endangered.The study of leaf hydraulic traits in cycads species enhances our understanding of their adaptation tothe water environments and responses to climate change.Weselected16 nativeCycas species from Nanning Botanical Garden and measured leaf morphological andanatomical characteristics，pressre-volume curves，hydraulic conductance，andcavitationresistance.Additionally，wecollectedleaf traitsof tropical-subtropicalangiosperms fromthe sameregion for comparativeanalysis.Theresults wereas follows：（1）There was slight interspecific variation in hydraulic traits across the16 Cycas species，andno significantdiferences were found in hydraulic traits betweenthe two groups distributed in karstand non-karst.（2）Compared toangiosperms，Cycas species showed higher leaf maximum hydraulic conductance （ Kleaf-max ），lower cavitation resistance（ P50leaf ），and smaller stomatal safety margin （ HSMtlp ）， tend toadoptarisky stomatalregulation strategy.（3）Diferentfromangiosperms，we foundano significanttrade-off between Kleaf-max and P50leaf in Cycas species，which partly due to the fact that leaf hydraulic traits of Cycas were less influencedbyanatomical structure.Thisstudyreveals thehydraulicstrategiesofCycas species，ilustrates the high leaf hydraulic risk of Cycas ，and there is an urgent need to conduct water physiological monitoring on natural distribution populations to enhance conservation management capabilities.
Keywords：tropical and subtropical，anatomical structure，hydraulic traits，Cycas，habitat
苏铁因其特殊的形态结构和中生代祖先相似的形态特征，被称为植物界的“活化石”（Brenneretal.，2003；Coiroetal.，2023）。（剩余24008字）