垂直结构对桂西北干热河谷木本植物枝叶关系的影响  

Effects of vertical structure on relationship between twigs and leaves of woody plants in the dry-hot valley of northwest Guangxi

作　　者：韦海航 张莉苑 杨景竣 卢志锋 田红灯[1] 李进华[1] 樊东函 覃杰[1] 刘佳哲 王智慧 WEI Hai-hang;ZHANG Li-yuan;YANG Jing-jun;LU Zhi-feng;TIAN Hong-deng;LI Jin-hua;FAN Dong-han;QIN Jie;LIU Jia-zhe;WANG Zhi-hui(Guangxi Forestry Research Institute/Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning 530002,China;Guangxi Terrestrial Endangered Animal Rescue and Epidemic Disease Monitoring Center,Nanning 530000,China;Guangxi State Owned Yachang Forest Farm,Baise,Guangxi 533200,China;Qinzhou Forestry Research Institute,Qinzhou,Guangxi 535000,China)

机构地区：[1]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,南宁530002 [2]广西壮族自治区陆生野生动物救护研究与疫源疫病监测中心,南宁530000 [3]广西国有雅长林场,广西百色533200 [4]钦州市林业科学研究所,广西钦州535000

出　　处：《西南农业学报》2024年第5期1071-1077,共7页Southwest China Journal of Agricultural Sciences

基　　金：广西科技计划项目(桂科AB21220026);广西优良用材林资源培育重点实验室开放课题(2020-A-04-04)。

摘　　要：【目的】探索桂西北干热河谷木本植物枝叶大小关系在垂直结构上的变化规律,为桂西北干热河谷地区植物保护及植被恢复提供理论依据。【方法】以广西雅长林场天然次生林群落为研究对象,采用单因素方差分析法、标准化主轴估计法和相关分析法,分析不同林层木本植物枝叶的性状大小差异、枝叶性状间的异速生长关系及相关关系。【结果】不同林层木本植物大部分枝叶性状存在显著差异(P<0.05,下同),随着林层的升高,枝条鲜质量、枝条干质量、小枝直径、总叶面积、叶片鲜质量、叶片干质量和叶片干物质含量均呈上升趋势,枝条相对含水量、分梢密度、单叶面积、叶片相对含水量和比叶面积均呈下降趋势。不同林层木本植物小枝横截面积与总叶面积均呈显著正向的异速生长关系,与分梢密度呈显著负向的异速生长关系,均存在共同斜率,且回归方程截距均存在显著差异,说明垂直结构变化未能改变木本植物枝条大小与枝条数量和叶面积的生物量权衡关系,但可显著改变枝叶性状资源配置比例,其中,高林层木本植物单位面积小枝上所支持的小枝数量更少,所支撑的总叶面积更多;相关分析结果表明,垂直结构变化对木本植物枝叶性状间相关性影响显著,相较于上层林,下层和中层林木本植物枝叶性状间的相关性更紧密。【结论】垂直结构变化未对木本植物枝叶性状间的权衡关系产生显著影响,但对枝叶的生物量配置方式影响显著,上层林木本植物单位面积小枝上具有更高的叶面积,而下层林木本植物单位面积枝条上所支撑的小枝数量更多,这是桂西北干热河谷木本植物适应异质环境所采取的生态策略。[Objective]The present paper aimed to explore the changing law of twig and leaf size relationship in the vertical structure of wood-y plants in the dry-hot valley of northwest Guangxi,and provide a theoretical basis for plant protection and vegetation restoration in the dry-hot valley of northwest Guangxi.[Method]The natural secondary forest community in Yachang Forest Farm in the dry-hot valley of northwest Guangxi was studied by using one-way ANOVA,standardized principal axis estimation and correlation analysis to analyze the size diference allometric growth relationship and correlation relationship among twigs and leaves in diferent forest layers.[Result]There were significant differences in the traits of most twigs and leaves in different forest layers(P<0.05,the same as below).With the increase of forest layer,twig fresh weight,twig dry weight,twig diameter,total leaf area,leaf fresh weight,leaf dry weight and leaf dry mater content showed an increasing trend,while twig relative water content,branching intensity,individual leaf area,leaf relative water content and specific leaf area showed a de-creasing trend.There was a significant positive allometric growth relationship between twig cross-sectional area and total leaf area,and a sig-nificant negative allometric growth relationship between twig cross-sectional area and branching density in different forest layers,with a com-mon slope and significant differences in the intercept of the regression equation,indicating that vertical structure changes do not change the ecological tradeoff between branch size,branch number and leaf area,but significantly changed the proportion of resource allocation for twig and leaf traits.Tall forest plants supported fewer twigs per unit area and more total leaf area.Correlation analysis showed that vertical structure changes have a significant impact on plant twig and leaf traits,and the correlation between plant twig and leaf traits was closer in lower and middle forest than in upper forest.[Conclusion]Vertical structural cha

关 键 词：木本植物 枝叶关系 垂直结构 异速生长 干热河谷 

分 类 号：S719[农业科学—林学]