竖向荷载作用下黄茅根系抗拔承载力试验分析
Experimental Analysis of the Tension Bearing Capacity of Heteropogon contortus Roots Under Vertical Load

为了探索整株植物的抗拔承载力与生物量指标之间的关系，以黄茅为研究对象，采用直接施加竖向荷载的方法进行了野外原位抗拔承载力试验，获得了黄茅的分枝数、根系质量、地上部分质量、根冠比等生物量指标以及整株植物的抗拔承载力等力学指标，采用数理统计方法对黄茅的生物量指标和力学指标进行分析，得到这些指标值的变化区间和分布频率.试验结果表明：有73%的黄茅分枝数低于50个，根系质量和地上部分质量分别集中在0~40 g和0~100 g，69%的黄茅根冠比小于1，根系抗拔承载力集中在200~600 N.黄茅的根系抗拔承载力与根系质量、分枝数、地上部分质量有关，随着分枝数增多，根系质量和地上部分质量增加，根系抗拔承载力也随之增加，通过数据拟合，根系抗拔承载力与根系质量呈幂函数相关关系，与分枝数和地上部分质量呈线性函数相关关系.
In an in-situ pullout test carried out in the field, the method of direct vertical load was applied to Heteropogon contortus to explore the relationship between the tension bearing capacity of the whole plant and the biomass indexes. The biomass indexes of the plant such as branch number, root mass, shoot mass and root-shoot ratio and the mechanics indexes such as bearing capacity were obtained. These indexes were analyzed with the method of mathematical statistics, and their change intervals and distribution frequencies were obtained. The results showed that about 73 percent of the plants had a branch number of < 50, their root mass and shoot mass were mostly distributed in the range of 0-40 and 0-100, respectively, about 69 percent of the of the plants had a root-shoot ratio of < 1, and the tension bearing capacity was mostly in the range of 200-600. The tension bearing capacity of H. contortus was associated with branch number, root mass and shoot mass. The tension bearing capacity of the root system increased with the increase in branch number, root mass and shoot mass of the plant. Data fitting showed a power function correlation between tension bearing capacity and root mass and a linear function correlation between tension bearing capacity and branch number or shoot mass