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Contrast in vulnerability to freezing-induced xylem embolism contributes to divergence in spring phenology between diffuse-and ring-porous temperate trees

引用

Forest Ecosystems 2022年第6期9卷 734-744页

作者： Ai-Ying Wang Han-Xiao Cui Xue-Wei Gong Jing-Jing Guo Nan Wu Guang-You Hao School of Life Sciences and Engineering Shenyang UniversityShenyang110044LiaoningChina Liaoning Key Laboratory of Urban Integrated Pest Management and Ecological Security College of Life Science and BioengineeringShenyang UniversityShenyang110044LiaoningChina CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang110016China University of Chinese Academy of Sciences Beijing100049China Tree Laboratory Shenyang Academy of Landscape-gardeningShenyang110016LiaoningChina

Background:The spring phenology and growth strategy of temperate tree species can be strongly linked to their sensitivity to frosts,which deserve more profound investigations under the background of climate warming particularly considering the advancement of spring phenology as well as the increase in frequency and intensity of spring cold ***:Spring phenologies,stem radial growth characteristics,frost sensitivity of leaves and stem hydraulic systems were studied in five diffuse-porous and five ring-porous temperate tree species under a common garden ***:The results showed that the spring leaf phenology of the diffuse-porous species was one to two weeks earlier than that of the ring-porous *** ring-porous species had significantly higher stem hydraulic conductivity than the diffuse-porous species(1.81 and 0.95 kg·m^(-1)·s^(-1)·MPa^(-1),Pporous species,while it only increased from 21.3%to 38.3%in the diffuse-porous *** spring phenology was clearly correlated with vulnerability to freeze-thaw induced embolism,with the more vulnerable ring-porous species exhibited substantially delayed phenology to reduce risks of catastrophic hydraulic dysfunction during spring ***,ring-porous species can offset the postponed onset of growth and gained even higher annual growth due to significantly higher hydraulic efficiency and leaf gas exchange ***:Contrasts between ring-porous and diffuse-porous species in resistance to freeze-thaw induced embolism suggest that they face different selective pressures from early spring frosts,which may at least be partially responsible for their divergence in spring phenology and growth strategy and can potentially lead to di

关键词： diffuse-porous trees Freeze-thaw cycle Frost damage Ring-porous trees Spring phenology Xylem embolism

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