小麦根系力学性能及微观结构研究  

Mechanical Properties and Micro-structure of Wheat Roots

作　　者：郭维俊[1] 黄高宝[2] 王芬娥[2] 雒六元[1] 张明朗[1] 

机构地区：[1]兰州工业高等专科学校建筑工程系,兰州730050 [2]甘肃农业大学工学院,兰州730070

出　　处：《农业机械学报》2010年第1期92-95,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家"863"高技术研究发展计划资助项目(2002AA623191);甘肃省教育厅科技计划资助项目(200418)

摘　　要：测定了小麦成熟期根系力学性能的主要指标,研究了根的应力-应变规律,观察了根的微观组织结构,得到了根的解剖构造图像,建立了小麦根的横截面力学模型。结果表明:小麦根是一种典型的多相、筛状、不连续、不均匀、各向异性的复合材料,根具有一定的强度和良好的弹性,其承载能力取决于机械组织厚度、维管束数量,以及各组织及其细胞之间的连接形式和连接强度,小麦初生根和次生根的强度极限分别为21.21～57.25 MPa和3.08～13.07 MPa。The mechanical properties of wheat roots in mature were tested,and the curves on stress-strain of wheat roots were measured by the electronic testing machine CMT2502.The micro-structure of wheat roots was observed,and the SEM images of wheat roots were scanned by electron microscope.The relation between mechanical properties and micro-structure of wheat roots was analyzed,and mechanical model of wheat roots was established.The results showed that wheat root was a typical porous,no-continuous,no-homogeneous and anisotropic composite material. Wheat roots had enough strength and good flexibility,and its carrying capacity depended on the thickness of thick-walled cells and the numbers of vascular bundles,as well as the connection form and strength of cells in roots.The strength of primary root and secondary root were 21.21～57.25MPa and 3.08～13.07MPa,respectively.

关 键 词：小麦 根系 力学性能 微观结构 

分 类 号：S12[农业科学—农业基础科学] Q947.6[生物学—植物学]