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生态学杂志 ›› 2023, Vol. 42 ›› Issue (7): 1561-1567.doi: 10.13292/j.1000-4890.202307.012

• 研究报告 • 上一篇    下一篇

6种城市园林落叶树种光合耐热性及其与叶形态、解剖结构的关系

袁家梁1,迟天淇1,李秧秧2*


  

  1. 1西北农林科技大学林学院, 陕西杨凌 712100; 2黄土高原土壤侵蚀与旱地农业国家重点实验室, 西北农林科技大学水土保持研究所, 陕西杨凌 712100)

  • 出版日期:2023-07-10 发布日期:2023-07-04

Leaf photosynthetic thermotolerance in 16 urban tree species and its relationship with leaf morpho-anatomical structure.

YUAN Jialiang1, CHI Tianqi1, LI Yangyang2*   

  1. (1College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China; 2State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China).

  • Online:2023-07-10 Published:2023-07-04

摘要: 为应对未来全球热浪事件频发及城市热岛效应加剧,筛选耐热性强的城市绿化树种尤为必要。本文选取16个城市园林树种,研究了其叶光合耐热性阈值(PSII潜在量子效率损失50%所对应的温度T50)及其与叶形态、解剖结构的关系。结果表明:16个园林树种的T50介于46.1~50.6 ℃,平均值为48.6 ℃,与热带树木的T50接近,其中悬铃木的光合耐热性最强而垂柳的最弱。16个树种的光合耐热性阈值与叶面积呈显著正相关,而与其他形态和解剖结构参数间无显著相关性。叶面积和比叶质量可以较好预测叶光合耐热性。研究结果对未来北方城市绿化树种筛选有一定价值。


关键词: 光合耐热性, PSII潜在量子效率, 落叶树种, 叶形态, 叶解剖结构

Abstract: Selection of thermotolerant urban tree species is vital for coping with global frequent occurrence of heatwave events and the aggravation of urban heat island effect in the future. In this study, we examined leaf photosynthetic thermotolerance (the corresponding temperature at 50% loss of PSII potential quantum efficiency, T50) and its relationship with leaf morpho-anatomical structure (leaf morphology, leaf surface traits and cross-sectional anatomical traits) across 16 urban greening tree species. The results showed that T50 in these tree species ranged from 46.1 ℃ in Salix babylonica to 50.6 ℃ in Platanus acerifolia, and averaged 48.6 ℃, almost the same as T50 in tropical trees. The T50 was positively correlated with leaf area, and was not correlated with other morpho-anatomical traits. Leaf area and specific leaf mass could predict T50 based on multilinear regression. These results are helpful for the selection of future urban greening trees in northern China.


Key words: photosynthetic thermotolerance, PSII potential quantum efficiency, deciduous tree, leaf morphological trait, leaf anatomical structure.