Leaf traits of nine tropical lianas and their response to light
[Objective]Lianas are the characteristic groups of tropical gardens and the main materials of urban vertical greening.The growth and development are affected and restricted by light.Leaves are important photosynthetic sites of plants,and leaf traits can reflect the adaptability of plants to the light environment.Therefore,studying the response of leaf traits of lianas to light will provide theoretical basis and practical reference for the selection and configuration of lianas in urban landscaping construction.[Method]In this study,9 kinds of lianas commonly planted in gardens of Guangzhou city were selected.By comparing the differences of leaf thickness(TH),specific leaf area(SLA),upper and lower epidermal cells(TUE and TLE),palisade tissue(TPT),sponge tissue(TST)and other indicators between the sunny group and the shade group under natural conditions,the characteristics of leaf traits,coefficient of variation and phenotypic plasticity index were analyzed,and the response of leaf traits to light was explored.[Result](1)The difference of leaf dry weight(DW)and leaf fresh weight(FW)between different lianas was large,and the difference of DMC was the smallest and the most stable;(2)Nine species of lianas showed different leaf trait strategies in response to the two light environments.The TH of Parthenocissus dalzieliis in the full sun group was larger than that in the shade group,and the SLA in the shade group was larger than that in the full sun group.In the low light environment,the material exchange resistance was reduced and the light capture area was increased.The leaf traits of Allamanda cathartica had the opposite characteristics,and the traits performance of the other lianas in the two light environments were between the two;(3)The leaves of lianas in the shade group generally showed the characteristics of small TH,larger SLA,and small TUE,TLE,TPT and TST,which were in line with the characteristics of shade leaves;(4)The coefficient of variation of TPT in Lonicera japonica and Ficus pumila was higher than 50%,which was an ecologically adaptive trait,and the phenotypic plasticity index of DMC content was the smallest,which was the most stable trait.The plasticity of TLE,DW and TPT and other traits were highly plastic.[Conclusion]Lianas can be divided into three categories according to light adaptability.Parthenocissus dalzielii is a shade-tolerant liana;Allamanda cathartica and Quisqualis indica were sun-friendly lianas;The vines of Ficus pumila and Lonicera japonica,have a wider range of light adaptation,Artabotrys hexapetalus and Thunbergia grandiflora are neutral and inclined to be sun-friendly.
万方数据
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