作　　者： (石洋）; (苌姗姗）; (胡进波）; (刘元）;

机构地区： 中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处： 《中南林业科技大学学报》 2017年第7期123-129,共7页

摘　　要： 应拉木形成时往往伴随着产生高拉伸应力,以使树木在应对环境变化时,维持定向生长。胶质层是许多应拉木树种最典型的细胞结构特征。由于具有特殊的形态构造和化学成分,胶质层在应拉木拉伸应力形成时发挥的作用不容忽视,已成为当前的研究热点。本文从应拉木异常高的纵向干缩特性入手,分析胶质层在应拉木拉伸应力产生中发挥的重要作用,并总结归纳应拉木拉伸应力形成机理的研究,在此基础上提出细胞腔液体压力假说。针对目前拉伸应力产生机理研究中诸多亟待解决的问题,提出今后研究应结合多学科的研究方法和手段,以深入探究胶质层在应拉木高拉伸应力产生中的作用和拉伸应力产生的根本原因。 To keep their oriented growth, trees form tension wood with the generation of high growth stresses when facing the variation of the surroundings. Gelatinous layer is the most typical cell structure characteristic in many tension wood species. Owing to the distinctive structure and chemical contents, the contribution of gelatinous layer to tensile stress formation of tension wood shouldn＇t be neglected, and it has become a research hotspot to investigate the mechanism of tensile stress generation in tension wood. This paper starts with the peculiarly high longitudinal shrinkage of tension wood, analyzes the role of gelatinous layer in the generation of tensile stress, reviews research on the mechanism of tensile stress generation in tension wood and proposes a new hypothesis in terms of the liquid pressure of cell lumen. There still remain questions about the research of mechanism of tensile stress generation to be solved. Some proposals about combining with multidisciplinary research methods are also put forward to explore the role of gelatinous layer in tensile stress generation of tension wood and the basic mechanism of the tensile stress generation.

关 键 词： 应拉木 胶质层 拉伸应力 形成机理