不同年龄白桦比叶面积的生长阶段变异及冠层差异

doi:10.11707/j.1001-7488.20180903

摘要/Abstract

摘要： [目的]研究不同年龄植株叶片比叶面积的生长阶段变异特征及冠层高度差异，分析不同资源环境条件对比叶面积与其他叶性状相关关系的影响，为更好地阐明资源环境对性状的影响机制提供科学依据。[方法]以阔叶红松林演替前期树种白桦为研究对象，针对成年树和幼树，分别在叶生长期（6月）、叶稳定期（7月）和叶衰落期（9月）测定上、中和下3个冠层高度（只针对成年树）叶片的比叶面积、叶厚和干物质含量，分析植株年龄、生长阶段及冠层高度下3种叶性状的变异情况及其相关关系，并运用标准化主轴估计法（SMA）检验植株年龄、生长阶段和冠层高度对这些相关关系是否存在显著影响。[结果]成年树和幼树在不同生长阶段及成年树在不同冠层高度比叶面积、叶厚、干物质含量均存在显著变化。叶厚、干物质含量及二者乘积对比叶面积的解释程度在不同植株年龄、生长阶段、冠层高度均存在显著差异。在不同植株年龄、生长阶段及冠层高度比叶面积与叶厚、干物质含量均显著负相关，且比叶面积-叶厚及比叶面积-干物质含量之间相关关系的斜率在不同植株年龄、生长阶段及冠层高度均存在显著差异。[结论]不同植株年龄白桦比叶面积均随生长阶段的变化显著下降，随冠层高度的降低显著增加，且植株年龄、生长阶段和冠层高度均对比叶面积与叶厚、干物质含量间的相关关系存在显著影响。

关键词: 白桦, 比叶面积, 叶厚, 干物质含量, 相关关系

Abstract: [Objective] In this study, we investigatedvariations of specific leaf area (SLA) indifferent growth periods and canopy positions of Betula platyphylla at different ages, and analyzed the effects of different resources and environment conditions on SLA and its relationship with other leaf traits,which wouldhelp us to learn more about SLA variations and its influencing factors and provides the basis for better understanding of the impact of resources and environment on the traits.[Methods] B. platyphylla, an early successional tree species of broadleaved-Korean pine (Pinus koraiensis) forest, was selected as the study object. During the growth periods of leaf growth (June), leaf stabilization (July) and leaf senescence (September), the SLA, leaf thickness (LT) and leaf dry matter content (LDMC) of adult trees and saplings were measured, and the SLA, LT and LDMC in different canopy positions of adult treeswere also measured. The variation of the three leaf traits and their relationships in different plant ages, growth periods, and canopy positions were analyzed.Further, we tested whether plant age, growth period and canopy position significantly affected these relationships by using Standardized Major Axis (SMA) method.[Result] There were significant variations in SLA, LT and LDMC of adult trees and saplings in different growth periods and canopy positions. The influence degree of LT, LDMC and LT×LDMC on SLA significantly varied with plant ages. There were significant negative correlations between SLA and LT, LDMC in different plant age, growth stage and canopy height and the slopes between SLA-LT and SLA-LDMC differed significantly with plant ages,growth periods and canopy positions.[Conclusion] SLA of B.platyphylla at different plant ages decreased significantly with growth periods, and increased significantly with the decrease of canopy positions,and the relationship between SLA and LT, LDMC wassignificantly influenced by plant age, growthperiod and canopy position.

Key words: Betula platyphylla, specific leaf area, leaf thickness, leaf dry matter content, correlation

中图分类号:

S757

金明月, 姜峰, 金光泽, 刘志理. 不同年龄白桦比叶面积的生长阶段变异及冠层差异[J]. 林业科学, 2018, 54(9): 18-26.

Jin Mingyue, Jiang Feng, Jin Guangze, Liu Zhili. Variations of Specific Leaf Area in Different Growth Periods and Canopy Positions of Betula platyphylla at Different Ages[J]. Scientia Silvae Sinicae, 2018, 54(9): 18-26.

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