干旱河谷鞍叶羊蹄甲(Bauhinia brachycarpa)叶脉性状的纬度格局及成因  

Latitudinal pattern and causes of leaf vein traits of Bauhinia brachycarpa in arid valley

作　　者：吴一苓 李芳兰 包维楷[1,2] 胡慧 杨婷惠[1,2] 黎小娟 WU Yiling;LI Fanglan;BAO Weikai;HU Hui;YANG Tinghui;LI Xiaojuan(CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization/Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China;Univer-sity of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院山地生态恢复与生物资源利用重点实验室/恢复与生物多样性保育四川省重点实验室/中国科学院成都生物研究所,成都610041 [2]中国科学院大学,北京100049

出　　处：《生态学杂志》2024年第11期3275-3282,共8页Chinese Journal of Ecology

基　　金：国家重大研发计划项目(2017YFC0505105);第二次青藏高原综合考察研究(2019QZKK0301);国家科技基础资源调查专项(2019FY202300)资助。

摘　　要：为明确以叶脉密度为主的叶功能性状在物种水平上的生物地理格局特点及其影响机制,选取西南干旱河谷不同纬度(23°16′N—31°30′N,101°28′E—103°25′E)的优势灌木鞍叶羊蹄甲(Bauhinia brachycarpa)为研究对象,探讨其不同等级叶脉密度、叶形态性状在纬度梯度上的变化特点,并分析叶片性状之间的关系。结果表明:随纬度升高鞍叶羊蹄甲叶脉密度和叶片表面积呈现下降趋势,粗脉密度与比叶面积呈显著负相关,总密度、细脉密度均与叶表面积等叶形态性状相对独立,粗脉直径与叶形态性状和比叶面积具有较大的正相关性;叶脉性状随纬度的变化受旱季平均降水量、土壤阳离子交换量、海拔以及年平均气温等因子的综合作用。本研究结果有助于揭示干旱河谷地区旱生植物生态适应机理。The aim of this study was to clarify the biogeographic patterns of leaf functional traits of Bauhinia brachy⁃carpa,mainly vein density,and the influencing mechanisms.We investigated the variation characteristics of vein density in different grades and leaf morphology of Bauhinia brachycarpa,a dominant shrub along a latitude gradient(23°16′N-31°30′N,101°28′E-103°25′E)in the arid valley of southwest China,and analyzed the relationship among leaf traits.The results showed that vein density and leaf surface area decreased with increasing latitude,and that main vein density was negatively correlated with specific leaf area.The total vein density and minor vein density were independent of leaf morphological traits,such as leaf surface area,while the main vein diameter was positively correlated with leaf morphological traits and specific leaf area.The latitudinal variation of leaf vein traits was affect⁃ed by the average precipitation in dry season,soil cation exchange capacity,altitude,and annual average tempera⁃ture.Our results help reveal the ecological adaptation mechanism of xerophytes in arid valleys.

关 键 词：叶脉密度 叶表面积 干旱河谷 纬度梯度 

分 类 号：Q958.1[生物学—动物学]