摘要
为探究不同海拔梯度(1250~1650 m)下常绿树种及落叶树种的性状响应机制,以湖北星斗山国家自然保护区为对象,共采集植物样本230份,其中常绿植物样本148份,落叶植物样本82份,包含37个植物种,测定不同叶习性树种的叶片功能性状并进行研究。结果表明:叶绿素与叶片厚度呈显著的正相关关系(P<0.01),叶面积受叶宽(R^(2)=0.64~0.79)和叶长(R^(2)=0.13~0.80)共同影响,其中常绿树种叶宽对叶面积的解释度更高;常绿植物叶厚和叶绿素含量极显著高于落叶植物(P<0.001),而落叶植物叶宽和比叶面积显著更大(P<0.05);落叶植物叶绿素含量、叶片厚度均整体较常绿植物下降,叶片宽度、叶片长度、叶面积、比叶面积与干物质含量在所有海拔梯度中未发现显著变化。研究揭示了常绿树种及落叶树种通过权衡策略适应山地环境:常绿树种以叶厚、高叶绿素维持持续光合能力,落叶树种以宽叶、高比叶面积实现资源快速获取,为亚热带常绿落叶阔叶混交林植被适应机制提供研究依据。
To investigate the trait response mechanisms of evergreen and deciduous tree species along different altitude gradients(1250~1650 meters),Hubei Xingdou Mountain National Nature Reserve was selected as the study area.A total of 230 plant samples(148 evergreen plant samples and 82 deciduous plant samples)were collected,involving 37 plant species.The leaf functional traits of different leaf habit tree species were measured for research.The results showed that chlorophyll was significantly positively correlated with leaf thickness(P<0.01),and leaf area was influenced by both leaf width(R^(2)=0.64~0.79)and leaf length(R^(2)=0.13~0.80),with evergreen tree species having a higher explanatory power for leaf area;The leaf thickness and chlorophyll content of evergreen plants were significantly higher than those of deciduous plants(P<0.001),while the leaf width and specific leaf area of deciduous plants were significantly larger(P<0.05);The overall chlorophyll content and the overall leaf thickness of deciduous plants decreased compared to evergreen plants.No significant changes were found in leaf width,length,leaf area,specific leaf area,and dry matter content across all altitude gradients.The study revealed that evergreen and deciduous tree species adapt to mountainous environments through a trade-off strategy:evergreen tree species maintain sustained photosynthetic capacity with thick leaves and high chlorophyll content,while deciduous tree species achieved rapid resource acquisition with wide leaves and high specific leaf area.This study provided a research basis for vegetation adaptation mechanisms in subtropical evergreen deciduous broad-leaved mixed forests.
作者
王留洋
庞京艳
张科燕
WANG Liuyang;PANG Jingyan;ZHANG Keyan(Key Laboratory of Biological Resources Protection and Utilization in Hubei Province,Hubei Minzu University,Enshi 445000,China)
出处
《湖北民族大学学报(自然科学版)》
2025年第4期451-457,共7页
Journal of Hubei Minzu University:Natural Science Edition
基金
湖北民族大学博士启动基金项目(MY2018B027)。
关键词
常绿落叶阔叶混交林
植物功能性状
海拔梯度
叶习性
生活策略
evergreen and deciduous broad-leaved mixed forest
plant functional traits
altitude gradient
leaf habits
life strategy
