水土保持研究2024，Vol.31Issue(6)：130-138,9.DOI:10.13869/j.cnki.rswc.2024.06.026
4种消落带适生草本根系抗拉特性及与微观结构的关系
Relationship Between Tensile Properties and Microstructures of Four Kinds of Herbaceous Root in the Water-Level-Fluctuating Zone
摘要
Abstract
[Objective]The aims of this study are to examine the effect of the anatomical structure of herbaceous root systems on the mechanical properties of single roots,and to provide a basis for elucidating the micromechanical mechanism of soil consolidation by herbaceous root systems in water-level-fluctuating zone.[Methods]Four species of water-level-fluctuating zone herbs(Acorus calamus L.;Cynodon dactylon(Linn.)Pers.;Cy perus involucratus Rottb.;Arundo donax'Versicolor')were selected as research objects,and the single tensile test and microstructure determination test was carried out.[Results](1)The tensile force and tensile strength of the root system increased and decreased as a power function of diameter,respectively.The average tensile force of the root system of the four species of herbs was the largest in Arundo donax'Versicolor'(13.02 N),the smallest in Acorus calamus L.(5.90 N),which was significantly larger than the other three species of herbs(p＜0.05).The tensile strength was greatest for Cynodon dactylon(Linn.)Pers.(42.79 MPa)and smallest for Arundo donax'Versicolor'(24.16 MPa),with Acorus calamus L.and Cynodon dactylon(Linn.)Pers.being highly significantly greater than the other two herbs(p＜0.01).(2)The average ultimate elongation of the root systems of the four herbs was the largest for Cyperus involucratus Rottb.(36.18％)and the smallest for Cynodon dactylon(Linn.)Pers.(23.38％),which was significantly larger than that of the remaining herbs(p＜0.05).The modulus of elasticity of the root system decreased as a power function with increasing diameter,and the average modulus of elasticity was the largest for Cynodon dactylon(Linn.)Pers.(195.85 MPa)and the smallest for Cyperus involucratus Rottb.(72.00 MPa),Acorus calamus L.and Cynodon dactylon(Linn.)Pers.were significantly greater than Cyperus involucratus Rottb.(p＜0.05).(3)Except for Arundo donax'Versicolor',the basic structure with the cortical thickness was the largest,and the thickness of vascular bundle was the smallest.Except for Acorus calamus L.,the microstructural organization ratio with the area of the cortex accounted for the largest percentage,the area of the stele was the second largest,and the area of the phloem accounted for the smallest percentage.(4)The tensile performance of Acorus calamus L.was influenced by the surface area of the epidermis and pulp.The tensile performance of Cynodon dactylon(Linn.)Pers.was influenced by the surface area of the epidermis,xylem and phloem.The tensile performance of Arundo donax'Versicolor'was influenced by the surface area of the cortex and pulp.[Conclusion]Each of the four water-level-fluctuating zone herbs has its own advantages in terms of root sequestration capacity.Acorus calamus L.and Cyperus involucratus Rottb.mainly play the role in slowing down the deformation and damage of the slope in the subsidence zone.Arundo donax'Versicolor'mainly plays the role in consolidating soil.Cynodon dactylon(Linn.)Pers.can both buffer soil sliding and play the anchoring role.关键词
水库消落带/草本植物/抗拉特性/微观结构Key words
water level fluctuation zone/herbaceous plants/tensile characteristics/microstructure分类
农业科技引用本文复制引用
段继琪,李建兴,王波,杜技能,张立芸,段青松..4种消落带适生草本根系抗拉特性及与微观结构的关系[J].水土保持研究,2024,31(6):130-138,9.基金项目
国家自然科学基金"三江并流区水库消落带草本植物根系水下固土机理研究"(42167046) （42167046）
