摘要
植物功能性状之间的不同组合和权衡决定了植物的生活史对策,反映了植物对环境变化的适应,个体水平功能性状的变异更是其能量投资策略的体现。为获取随树高变化叶功能性状的变化,对蛟河阔叶红松林两个主要树种白桦和青杨的5个叶功能性状指标进行比较分析。结果表明,除青杨氮磷比外,两个树种的比叶面积、叶干物质含量、氮含量、磷含量及白桦氮磷比均与树高存在显著相关性,且多数相关系数高于0.5。对树冠进行分层比较,除氮含量外,白桦比叶面积、叶干物质含量、磷含量和氮磷比在树冠不同层次间差异显著,中层氮磷比小于14,上下层氮磷比大于14,但未超过16;青杨叶片主要生长在树冠中上层,且除氮磷比外,其他功能性状指标在树冠不同部位也有显著差异。叶功能性状随树高变化而变化可以认为主要由光照在树冠垂直变化引起的,体现了植物对光环境的适应及资源的分配差异。
Different combinations of plant functional traits and trade-offs determine the plant life history strategy, reflect the adaptation to environmental changes, the variation of functional traits in the individual level reflect energy investment strategy. In order to understand the changes of leaf functional traits along tree crown, we chose five leaf functional trait index of two main species （Betula platyphylla and Populus ussuriensis） in broad-leaved/Korean to analyze the discrepancy. The results indicated that, there was significant correlation between specific leaf area, leaf dry matter content, unit mass of nitrogen content, unit mass phosphorus content, N/P ratio with tree height in both two species, except the unit mass of nitrogen content in P. ussuriensis. For layered canopy, there were significant differences of specific leaf area, leaf dry matter content, unit mass phosphorus content, N/P ratio of B. platyphylla in three layers （upper, middle, lower）, except unit mass of nitrogen content. The leaf of P. ussuriensis grew in the middle and upper canopy, there were significant differences of specific leaf area, leaf dry matter content, unit mass of nitrogen content, unit mass phosphorus content in two layers. Changes of leaf functional traits with tree height could be mainly caused by changes of light intensity in the vertical direction through crown, reflecting the adaptation of plants to light environment, and different resource allocation way.
出处
《广东农业科学》
CAS
CSCD
北大核心
2014年第12期55-58,71,共5页
Guangdong Agricultural Sciences
基金
国家科技支撑计划项目(2012BAC01B03)
国家自然科学基金青年基金(31000263)
教育部科学技术重点项目(107014)
关键词
树冠高度
叶功能性状
白桦
青杨
tree crown
leaf functional traits
Betula platyphylla
Populus ussuriensis
