青藏高原东缘松科植物叶脉性状的变异

doi:10.13287/j.1001-9332.202305.018

摘要/Abstract

摘要： 为探究松科单叶脉植物沿环境梯度的变异规律及适应策略,本研究在青藏高原东缘沿纬度梯度(26°58′—35°33′ N)获取了48个取样点内57个松科植物的叶片,包括冷杉属、落叶松属、松属和云杉属,测定叶脉密度、叶脉直径和单位叶片体积叶脉体积等叶脉性状,分析叶脉性状之间的权衡及与环境变化的关系。结果表明: 叶脉密度在不同属间无显著差异,而叶脉直径和单位叶片体积叶脉体积在不同属间差异显著;在不同属中,叶脉直径和单位叶片体积叶脉体积之间均存在显著正相关关系,而叶脉密度与叶脉直径和单位叶片体积叶脉体积之间相关关系不显著;叶脉直径和单位叶片体积叶脉体积随纬度的增加而显著减小,而叶脉密度没有显著变化;年均温是影响松科植物叶脉直径和单位叶片体积叶脉体积变异的主要因子,叶脉密度与环境因子的关系较弱。松科植物特殊的单叶脉结构,具有与网状脉等复杂叶脉结构不同的环境适应策略,其主要通过调整叶脉直径和单位叶片体积叶脉体积来适应外界环境的变化。

关键词: 叶脉性状, 松科, 纬度, 青藏高原

Abstract: To explore the adaptative strategies of single-veined plants along the environmental gradient, we collec-ted leaves of 57 Pinaceae species (including Abies, Larix, Pinus and Picea) from 48 sites along a latitudinal gradient (26°58′-35°33′ N) on the eastern Qinghai-Tibet Plateau. By measuring three traits of leaf vein, including vein length per leaf area, vein diameter, and vein volume per unit leaf volume, we analyzed the trade-off between vein traits and their relationship with environmental changes. The results showed no significant difference in vein length per leaf area among different genera, but significant difference in vein diameter and vein volume per unit leaf volume. There was a positive correlation between vein diameter and vein volume per unit leaf volume for all genera. There was no significant correlation of vein length per leaf area with vein diameter and vein volume per unit leaf volume. With the increases of latitude, vein diameter and vein volume per unit leaf volume significantly decreased. In contrast, vein length per leaf area did not show a latitudinal trend. Mean annual temperature was the main factor driving the variation in vein diameter and vein volume per unit leaf volume. The relationships between vein length per leaf area and environmental factors were relatively weak. These results indicated that the single-veined Pinaceae plants have a special adaptative strategy to environmental changes through adjusting vein diameter and vein volume per unit leaf volume, which is quite different from complex vein structures such as reticular veins.

Key words: leaf vein trait, Pinaceae, latitude, Qinghai-Tibet Plateau

朱荣, 杨雪, 龚浩鑫, 王志波, 陈爽, 王小春, 王瑞丽. 青藏高原东缘松科植物叶脉性状的变异[J]. 应用生态学报, 2023, 34(5): 1203-1210.

ZHU Rong, YANG Xue, GONG Haoxin, WANG Zhibo, CHEN Shuang, WANG Xiaochun, WANG Ruili. Variation in leaf vein traits of Pinaceae plants on the eastern Qinghai-Tibet Plateau, China[J]. Chinese Journal of Applied Ecology, 2023, 34(5): 1203-1210.

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