16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  

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

作　　者：袁家梁 迟天淇 李秧秧 YUAN Jialiang;CHI Tianqi;LI Yangyang(College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Pla-teau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi,China)

机构地区：[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　　处：《生态学杂志》2023年第7期1561-1567,共7页Chinese Journal of Ecology

基　　金：中国科学院先导性项目B类子课题(XDB20020202)资助。

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。Selection of thermotolerant urban tree species is vital for coping with global frequent occurrence of heat-wave events and the aggravation of urban heat island effect in the future.In this study,we examined leaf photosyn-thetic thermotolerance(the corresponding temperature at 50%loss of PSII potential quantum efficiency,T 50)and its relationship with leaf morpho-anatomical structure(leaf morphology,leaf surface traits and cross-sectional ana-tomical traits)across 16 urban greening tree species.The results showed that T 50 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 T 50 in tropi-cal trees.The T 50 was positively correlated with leaf area,and was not correlated with other morpho-anatomical traits.Leaf area and specific leaf mass could predict T 50 based on multilinear regression.These results are helpful for the selection of future urban greening trees in northern China.

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 

分 类 号：S688[农业科学—观赏园艺]