热水河小流域香薷根系力学性能分析

探究植被根系力学性能，对于山区小流域滑坡、泥石流等地质灾害防治过程中如何评估植被护坡性能具有重要意义。以四川省凉山彝族自治州喜德县境内热水河小流域的常见植物香薷为研究对象，对其进行原位拉拔试验与室内单根拉伸试验以获取其根系力学性能指标，并采用灰色关联分析法研究了香薷根幅、根长、地径、冠幅、株高与其原位抗拔力的关联性，分析了香薷单根根径、根长、根系含水条件对其室内单根抗拉力的影响。结果表明：（1）香薷不同生长量指标与其原位抗拔力的关联度由大到小依次为根幅、根长、地径、冠幅和株高，换言之，由香薷地下生长量指标（根幅与根长）表征香薷原位抗拔力效果更好；（2）香薷室内单根抗拉力与根径之间关系呈现正相关；香薷自然根系和浸泡根系的平均抗拉强度随根长增长总体呈现降低趋势，而干燥根系情况正好相反；香薷根系平均抗拉强度随根系含水率降低总体呈现增大趋势。上述研究结果可为热水河等山区小流域植被生态护坡和水土保持研究提供一定参考。

Analysis of Mechanical Properties of Elsholtzia Root in The Small Watershed of Reshui River

Exploring the mechanical properties of vegetation root is of great significance for how to evaluate the performance of vegetation slope protection in the process of preventing geological disasters such as landslides and debris flows in small watersheds in mountainous areas. Taking Elsholtzia, a common plant in the small watershed of Rehui River in Xide County, Liangshan Yi Autonomous Prefecture, Sichuan Province, as the research object, the in-situ pull-out test and indoor single root tensile test were carried out to obtain the mechanical properties of the root. The gray correlation analysis method was used to study the correlation between the root breadth, root length, root diameter, crown breadth, plant height of Elsholtzia and the in-situ pull-out resistance of Elsholtzia. Furthermore, the influences of the single root diameter, root length, and root water conditions of Elsholtzia on its indoor single root tensile strength are also analyzed. The results show that: (1) The correlation degree values between the different growth indexes of Elsholtzia and its in-situ pull-out resistance in descending order are root breadth, root length, root diameter, crown width and plant height, which means the in-situ pull-out resistance of Elsholtzia can be better characterized by the underground growth indexes (i.e., root breadth and root length); (2) The single root tensile force of Elsholtzia has a positive correlation with root diameter; The average tensile strength of the natural root and the immersed root generally decreases with an increasing of root length, as contrasted to the dry root; The average tensile strength of the root of Elsholtzia generally increases with the decrease of root moisture content. The above research results can provide a certain reference for ecological slope protection as well as soil and water conservation research in the small watershed in mountainous areas such as Reshui River.