摘要:垂直分层是森林群落的基本结构，但有关群落不同垂直层次植物水力结构策略的研究仍然比较缺乏。以浙江天童木荷林内25株高度不同的9种木本植物为对象，通过测量其枝条直径、边材面积、干材密度、导管直径、内腔面积以及枝条水分比导率，旨在检验植物水力结构与树高的关联性。结果显示：除干材密度外，枝条直径、导管直径、枝条和导管内腔面积、边材面积、水分比导率均随树高增加而显著增大。作为重要的水力结构特征，比导率与导管直径和内腔面积、枝直径和内腔面积、边材面积显著正关联。该结果强调了局域群落内不同垂直层次植物水力结构特征的显著差异，以及植物水分生态位在不同垂直层次的分化过程。



Abstract:Vertical stratification is the basic structure of the forest community, but plant hydraulic strategies related to community vertical layers are poorly understood. We tested the association between plant height and hydraulic architecture by measuring twig diameter, sapwood area, wood density, vessel diameter, vessel lumen area, and twig specific conductivity on 25 individuals of 9 species, in a Schima superba community in Tiantong, Zhejiang Province. The results showed that twig diameter, vessel diameter, vessel lumen area, twig lumen area, sapwood area, and twig specific conductivity increased significantly with plant height. As a key hydraulic trait, twig specific conductivity positively associated with vessel diameter and lumen area, twig diameter and lumen area, and sapwood area. The results highlight the remarkable differences of plant hydraulic architectures and the process of the hydraulic niche partition for plants between vertical layers in the local forest communities.





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