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Forest and Grassland Resources Research >

2025 , Vol. 0 >Issue 5: 96 - 104

DOI: https://doi.org/10.13466/j.cnki.lczyyj.2025.05.010

Canopy variation in leaf functional traits and seasonal characteristics of ecological strategies in Ulmus pumila ‘Jinye’

  • WANG Chao ,
  • LIU Ting ,
  • XU Shuang ,
  • CAI Shishu ,
  • LAI Zeyu ,
  • LU Jie
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  • 1. Institute of Xizang Plateau Ecology, Xizang Agricultural and Animal Husbandry University, LinZhi 860000,Xizang, China
    2. Key Laboratory of Forest Ecology in Xizang Plateau(Xizang Agricultural and Animal Husbandry University), Ministry of Education, LinZhi 860000,Xizang, China
    3. LinZhi National Forest Ecosystem Observation and Research Station of Xizang, LinZhi 860000,Xizang, China
    4. National Forestry and Grassland Administration’s Scientific Research and Monitoring Base for Forests and Grasslands on the Qinghai-Tibet Plateau, LinZhi 860000,Xizang, China
    5. Key Laboratory of Alpine Vegetation Ecological Security in Xizang, LinZhi 860000,Xizang, China

Received date: 2025-08-12

  Revised date: 2025-10-11

  Online published: 2026-04-17

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Abstract

To elucidate the multidimensional adaptation mechanisms of Ulmus pumila ‘Jinye’,an urban greening colored-leaf tree species in high-altitude regions,this study quantified eight leaf functional traits[relative chlorophyll content(RCC),specific leaf area(SLA),leaf dry matter content(LDMC),leaf volume(LV),leaf tissue density(LTD),leaf relative water content(LRWC),leaf thickness(LT),and leaf area(LA)]across a vertical canopy gradient(upper,middle,and basal layers)during the growing season(May-October)in Linzhi,Xizang.The analysis integrated vertical canopy stratification with the CSR plant ecological strategy model to examine adaptations across spatial and temporal scales.The results showed that:1)The eight functional traits exhibited moderate variation(Cv range:20%-50%)with a "stability-plasticity" dual pattern:leaf relative water content(Cv=7.68%)maintained the highest stability,while relative chlorophyll content(Cv=44.24%)manifested the maximum plasticity.2)Significant trade-offs existed among traits:the photosynthetic trait(SLA)was exhibited a highly significant negative correlation with structural traits(LTD,LDMC)(P<0.01),but positively correlated with water retention capacity(LRWC)(P<0.05),indicating a synergy between photosynthesis and water maintenance.3)Along the vertical canopy gradient,trait combinations shifted from a resource-acquisitive type(higher SLA at the base)to a conservative type(higher LT at the top),reflecting a spatial trade-off between light resource capture and environmental stress.4)Seasonal dynamics revealed a continuous shift in resource allocation toward stress tolerance(S value:increasing from 39% to 66%),accompanied by a decline in reproductive investment(R)and relative stability in competitiveness(C)(19%-27%).This substantiates a resource allocation pattern dominated by stress tolerance,which drove the ecological strategy transition from the stress-tolerant/ruderal/competitive-stress-tolerant-ruderal(SR/CSR)strategy,through the stress-tolerant/competitive-stress-tolerant-ruderal(S/CSR)strategy,to ultimately evolve into the stress-tolerant/competitive-stress-tolerant(S/CS)strategy by the end of the growing season.In conclusion,Ulmus pumila ‘Jinye’ has developed a spatiotemporally complementary multidimensional adaptation mechanism to mitigate high-altitude environmental stress through trait trade-offs and strategic shifts along the vertical canopy gradient and across seasonal dynamics.

Key words： ecological strategy; CSR strategy; canopy height; seasonal variation

Cite this article

WANG Chao , LIU Ting , XU Shuang , CAI Shishu , LAI Zeyu , LU Jie . Canopy variation in leaf functional traits and seasonal characteristics of ecological strategies in Ulmus pumila ‘Jinye’[J]. Forest and Grassland Resources Research, 2025 , 0(5) : 96 -104 . DOI: 10.13466/j.cnki.lczyyj.2025.05.010

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