护坡植物根系分布特征及抗拉强度研究  

Study on Distribution Characteristic and Tensile Strength of Slope Eco-Engineering Plant Root

作　　者：冯国建[1] 沈凡[1] 王世通[1] 

机构地区：[1]昆明学院城乡建设与工程管理学院,昆明650412

出　　处：《重庆师范大学学报（自然科学版）》2013年第2期115-118,共4页Journal of Chongqing Normal University:Natural Science

基　　金：云南省教育厅科学研究一般项目(No.2011Y233)

摘　　要：为研究植物根系固土护坡的力学机理,以芦竹(Arundo donax)、狗牙根(Cynodon dactylon)和早熟禾(Poa annua)为研究对象,对它们的根系分布特征及抗拉特性进行研究。结果表明,在根系分布特征方面,随着土层深度的增加,3种植物的根系数量逐渐减小,并且大部分集中在土层的上表面。数据拟合表明,采用幂函数模型能较好反映根系的空间分布;在根系抗拉特性方面,3种植物根系均表现出一定的抗拉能力,根系抗拉力与根径呈幂函数正相关关系,随根径增大而增大,3种植物按根系抗拉力由大到小依次排列为:芦竹、狗牙根、早熟禾;根系抗拉强度与根径呈幂函数负相关关系,随根径增大而减小。In order to study the mechanism of plant root, taking Cynodon dactylon. Arundo donax and Poa annua as the research projects, to study the distribution characteristic and tensile strength, the results show that with the increase of the soil depth, the amount of these 3 kinds of plant roots are gradually reducing, and the most roots on top of the soil. Through the fitting, the power function model can better reflect the roots spatial distribution. On the roots tensile properties, 3 kinds of plant roots showed the tensile capacity, the roots tensile force show positive power function correlated relation with the roots diameter, 3 kinds of roots tensile force ordinal for Arundo donax 〉 Cynodon dactylon 〉Poa annua. The tensile strength show negative power function relation with the root diameter, with the roots diameters enlarge, the tensile strength is gradually reducing.

关 键 词：分布特征 抗拉特性 芦竹 狗牙根 早熟禾 幂函数 

分 类 号：Q944.54[生物学—植物学] Q947.6