摘要:植物叶形态与叶脉网络功能性状的协同变异与权衡关系，对深入理解植物叶脉网络功能性状对环境变异的生态适应，以及预测植物物种生活习性对城市化过程的响应具有重要意义。闽楠作为珍贵的常绿阔叶树种，正在城市绿化中逐步推广。针对不同生长环境中（行道与植物园混交林）的闽楠，开展了叶形态与叶脉网络功能性状关系对城市生长环境的响应研究。研究结果表明：闽楠叶性状值基本满足正态分布，各性状变异系数保持在10%-20%之间，群体内性状变异较为丰富，单因素方差分析表明两种环境对叶形态性状的影响比叶脉网络系统的影响更明显；两种生长环境下闽楠叶形态性状组与叶脉网络功能性状组都具有极显著相关性，行道和植物园混交林典型性相关系数分别为0.804和0.795，叶形态性状与叶脉直径呈显著正相关，形态性状、叶脉直径与初级脉密度呈显著负相关；闽楠在响应城市生长环境的过程中呈现出相应的经济权衡机制，行道环境中闽楠以较大的初级脉密度和较小叶面积来确保水分获取和光合之间的平衡，植物园闽楠则采用较低初级叶脉密度、较高叶面积和叶脉直径的叶形态和叶脉网络构建模式。在选择闽楠作为城市绿化树种时，可将叶片形态性状组与叶脉网络功能性状组的协同变化和权衡关系作为选种依据，以提高闽楠在城市环境中的成活率和适应性。



Abstract:The synergistic variation and trade-off relationship between leaf morphology and functional traits of vein network is of great significance for understanding the ecological adaptation of functional traits of vein network to environmental variation and predicting the response of plant species' habits to urbanization. As a precious evergreen broad-leaved tree species, Phoebe bournei is being gradually popularized in urban greening. In this study, we studied the response of leaf morphology and vein network functional trait relationship to different urban growth environments of Phoebe bournei (road and botanical garden mixed forest). The results showed that the values of leaf traits basically met the normal distribution, and the variation coefficients of each trait mostly kept between 10%-20%, and the variation of characters within the population was relatively rich. One-way analysis of variance showed that the influence of two environments on leaf morphological traits was more obvious than that of the vein network system. The leaf morphological traits were significantly correlated with the functional traits of vein network under the two growth environments. The typicality correlation coefficients were 0.804 and 0.795, respectively. The leaf morphological traits were positively correlated with vein diameter, and the morphological traits, vein diameter and primary vein density were negatively correlated. Phoebe bournei in response to the process of urban growth environment presents corresponding economic balance mechanism. In the road environment, the larger primary vein density and smaller leaf area were used to ensure the balance between water acquisition and photosynthesis, while in the botanical garden, the lower primary vein density, higher leaf area and vein diameter were used as the leaf morphology and vein network construction model. In order to improve the survival rate and adaptability in urban environment, the synergistic change and trade-off relationship between leaf morphological traits and vein network functional traits can be used as the selection basis when selecting Phoebe bournei as urban greening tree species.





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