摘要
【目的】探究遮荫对白花泡桐叶片结构功能的影响。【方法】以白花泡桐(Paulownia fortunei)为材料,设置了无遮荫、(50%)中度遮荫和(90%)重度遮荫3个光照梯度,测定了不同光照处理下叶片经济学性状、水力学性状和叶片大小,分析3个性状间的关系。【结果】随遮荫程度的增加,叶片经济学性状中比叶面积显著增加,叶厚度、叶组织密度和比叶质量显著降低;叶水力学性状中叶脉密度、叶脉直径和气孔密度显著降低,而遮荫对气孔大小没有影响;遮荫后单个叶片面积显著增加。叶脉密度和叶脉直径呈强烈正相关关系,而气孔大小和气孔密度不相关,且叶片上述3类性状呈现较强的耦合关系。【结论】遮荫显著影响白花泡桐叶片的经济学性状、水力学性状和叶片大小。与中度遮荫相比,重度遮荫后叶经济学性状、水力学性状和叶片大小变化幅度更加明显。
【Objective】The purpose of our study is to explore the effect of different shading environments on leaf functional traits for Paulownia fortunei.【Method】Using the Paulownia fortunei as material,three light gradients were set up,namely no shading,medium(50%)shading,and heavy(90%)shading,respectively.We measured the leaf economic traits,leaf hydraulic traits and leaf size under different treatments,and the relationships among three leaf traits were analyzed.【Result】With the increase of shading intensity,specific leaf area in leaf economic traits increased significantly,while leaf thickness,leaf tissue density and specific leaf weight decreased significantly;leaf vein density,leaf vein diameter and stomatal density in leaf hydraulic traits significantly decreased,while stomatal size showed no response to the shading treatments;single leaf area,an index depicting leaf size,significantly increased after the shading.In addition,there was a strong and positive correlation between leaf vein density and leaf vein diameter,but no correlation between stomatal size and stomatal density.Moreover,a strong coupling of the leaf economic traits,leaf hydraulic traits and leaf size was found.【Conclusion】Shading significantly affected the leaf economic traits,leaf hydraulic traits and leaf size of Paulownia fortunei.Compared with the medium shading,much larger changes of the leaf traits were observed under the heavy shading.
作者
侯月爽
陈静
曹静静
王豪杰
孔德良
范国强
HOU Yueshuang;CHEN Jing;CAO Jingjing;WANG Haojie;KONG Deliang;FAN Guoqiang(College of Forestry,Henan Agricultural University,Zhengzhou 450046,China)
出处
《河南农业大学学报》
CAS
CSCD
2023年第4期581-590,共10页
Journal of Henan Agricultural University
基金
国家自然科学基金项目(32171746)
河南农业大学高层次人才引进启动费项目(30500854)
河南省留学人员科研择优资助经费项目(30602423)。
