小兴安岭不同径级白桦枝叶性状变异及权衡  

Variations and trade-offs of twig-leaf traits for Betula platyphylla with different diameter classes in Xiaoxing’an Mountains of northeastern China

作　　者：解书文 金光泽[1] 刘志理[1] Xie Shuwen;Jin Guangze;Liu Zhili(Center for Ecological Research,Key Laboratory of Sustainable Forest Ecosystem Management of Ministry of Education,Northeast Forestry University,Harbin 150040,Heilongjiang,China)

机构地区：[1]东北林业大学生态研究中心,森林生态系统可持续经营教育部重点实验室,黑龙江哈尔滨150040

出　　处：《北京林业大学学报》2023年第12期32-40,共9页Journal of Beijing Forestry University

基　　金：国家重点研发青年科学家项目(2022YFD2201100);国家自然科学基金项目(31971636);中央高校基本科研业务费专项(2572022DS13)。

摘　　要：【目的】植物可以通过调整自身性状变化从而更有效地利用资源。探究不同径级植物枝叶性状间的变异及其相关关系,对理解植物功能性状种内变异及对资源的获取策略具有重要意义。【方法】以黑龙江凉水国家级自然保护区阔叶红松林中的白桦为研究对象,选取3个径级(小树、中等树、大树)的样树,测定其枝横截面积、单叶面积、总叶面积、总叶干质量、枝干质量和出叶强度。采用单因素方差分析检验枝叶性状在不同径级间是否存在显著差异;以标准化主轴预估检验径级对白桦枝叶性状间的相关关系是否存在影响。【结果】随着径级的增加,枝横截面积呈上升趋势,单叶面积和总叶面积呈下降趋势,而总叶干质量、枝干质量、出叶强度不存在显著差异。不同径级白桦的枝横截面积与单叶面积、总叶面积和总叶干质量呈显著正相关,与出叶强度呈显著负相关,其中,小树和大树枝横截面积与总叶面积和总叶干质量呈接近1的等速生长关系,而中等树呈接近1.5的异速生长关系;单叶面积与出叶强度显著负相关,呈异速生长关系。径级对白桦枝叶性状相关关系的斜率或截距存在显著影响。【结论】在同一群落内,不同径级的白桦枝叶性状存在差异是其自身的一种资源获取策略,且枝叶性状为了获得有效的资源而协同变化。[Objective]Plants can use resources more efficiently by adjusting their own traits.Exploring the variation and correlation between twig and leaf traits of plants with different diameter classes is of great significance for understanding the intraspecific variation of plant functional traits and the resource acquisition strategies of plants.[Method]In Liangshui National Nature Reserve of Heilongjiang Province of northeastern China,three diameter classes of Betula platyphylla were selected(including small tree,middle tree and large tree).The twig cross-sectional area,individual leaf area,total leaf area,total leaf dry mass,twig dry mass and volume-based leafing intensity were measured in different diameter classes.Oneway analysis of variance was used to test whether there were significant differences in twig-leaf traits among varied diameter classes.The method of standardized main axis estimation was used to test whether the diameter class had an effect on the correlation between the twig and leaf traits.[Result]With the increase of diameter class,twig cross-sectional area showed an upward trend,individual leaf area and total leaf area showed a downward trend,but there was no significant difference in total leaf dry mass,twig dry mass,volume-based leafing intensity.The twig cross-sectional area was significantly positively correlated with individual leaf area,total leaf area and total leaf dry mass,but was significantly negatively correlated with volume-based leafing intensity,among them,the cross-sectional area of small trees and large trees had an isokinetic growth relationship of close to 1 with the total leaf area and total leaf dry mass,while the medium tree had an allometric growth relationship close to 1.5;individual leaf area exhibited significantly negative correlations with volume-based leafing intensity,showing an allometric relationship;the diameter class had a significant effect on the slope or intercept of the correlations between twig-leaf traits.[Conclusion]Within the same community,the difference i

关 键 词：白桦 径级 枝叶性状 变异 

分 类 号：S792.153[农业科学—林木遗传育种]