首页|桂西南岩溶区植物叶性状的系统发育信号及其关联分析

桂西南岩溶区植物叶性状的系统发育信号及其关联分析

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[目的]探究岩溶植物叶性状在不同生活型水平上的差异以及系统发育保守性，有助于深入理解植物对异质性生境的适应机制，进而为岩溶植被的保护与恢复提供科学依据。[方法]以桂西南岩溶区20 种常见阔叶木本植物为对象，采用K值法检验了叶性状的系统发育信号，并运用系统发育独立比较(PIC)和标准化主轴估计(SMA)的方法分析了叶性状间的关联适应性。[结果]1)研究区植物群落 10 个叶性状均未表现出较强的系统发育保守性，系统发育结构与性状结构并不完全一致。2)叶面积(LA)与叶长(LL)、叶宽(LW)以及叶组织密度(LTD)与LL、叶体积(LV)间均呈异速生长关系，而LL与LW、LA与叶干质量(LDW)间均呈等速生长关系;其中，LTD与LL的生长关系在常绿植物组发生了改变，由异速生长关系转变为等速生长关系;其他性状组合间的生长关系并未因生活型的不同而引起差异，表明常绿植物倾向于限制LL以适应环境的变化;3)LA、LL和LW以及LTD与LL、LV在常绿和落叶植物组间的斜率均沿共同主轴方向显著漂移(P＜0。05)，表明常绿和落叶植物对环境的适应策略发生了位移，常绿植物倾向于选择小叶、组织密度大的资源保守型生长策略，而落叶植物则倾向于选择大叶、组织密度小的资源获取型生长策略。[结论]生态位分化在很大程度上是促进亚热带阔叶林群落物种共存和生物多样性维持的重要机制。
Phylogenetic signals of plant leaf traits and their correlation analysis in the karst region of southwestern Guangxi
[Objective]Exploring the differences in leaf traits and phylogenetic conservatism of karst plants of different life types can help to deeply understand the adaptive mechanisms of plants to highly heterogeneous habitat,and provide scientific basis for the conservation and restoration of karst vegetation.[Method]Twenty common broad-leaved woody plants in a karst region of southwestern Guangxi were studied.The Phylogenetic signals and correlations among leaf traits were tested by using Blomber's K value,phylogenetic independent contrast(PIC)and standardized major axis estimation(SMA).[Result]1)None of the studied ten leaf traits showed strong phylogenetic conservatism,and the phylogenetic structure was not fully consistent with the trait structure.2)Overall,there were allometric growth relationship between leaf area(LA)and leaf length(LL)and width(LW),and between leaf tissue density(LTD)and leaf length(LL)and volume(LV).In contrast,the isokinetic growth relationship were found between leaf length and leaf width,and between leaf area and leaf mass.Except that the growth relationship between LTD and LL shifted from allometric to isokineticin the deciduous plant,the growth relationship between other trait combinations didn't differ between life forms,which indicated that ever-green plant tends to limit LL growth for adapting the environment changes.3)The slopes between LA and LL and LW,as well as between LTD and LL and LV for both of ever-green and deciduous plant significantly along the direction of the common principal axis(P＜0.05),suggesting a change of adaptive strategies of evergreen and deciduous plants to their environment.The ever-green plant tended to choose the resource-conserving growth strategy with smaller leaf area and higher leaf tissue density,whereas the deciduous plant tends to choose the resource-acquiring growth strategy with larger leaf area and lower leaf tissue density.[Conclusion]Ecological niche differentiation is largely an important mechanism to promote species coexistence and biodiversity maintenance in broadleaf forest communities in subtropical regions.

leaf traitstandardized major axis estimationphylogenetic independent contrastallometric growthphylogenetic signalkarst

庞世龙、欧芷阳、申文辉、叶斯进、黄宝珍、凌福诚、陆国导

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广西壮族自治区林业科学研究院国家林业和草原局中南速生材繁育实验室,广西 南宁 530002

广西壮族自治区林业科学研究院广西优良用材林资源培育重点实验室,广西 南宁 530002

南宁青秀山风景名胜旅游开发有限责任公司,广西 南宁 530022

平果市林业局,广西 平果 531499

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叶性状 标准化主轴估计 系统发育独立比较 异速生长 系统发育信号 岩溶

广西林业科技推广示范项目中央财政林业科技推广示范项目广西科技基地和人才专项

桂林科研[2022]24号[2022]TG23号桂科22-035-130-02

2024

10.14067/j.cnki.1673-923x.2024.07.001

中南林业科技大学学报
中南林业科技大学

中南林业科技大学学报

CSTPCD北大核心
影响因子：1.442
ISSN：1673-923X
年,卷(期)：2024.44(7)