甘肃科学学报

为研究草本植物对泥流的制约机制，在泥石流沟道现场调查基础上，采用量测法、公式计算法、统计图解法和分维法，分析了草本植物特征、草本植物与冲蚀的关系、冲蚀分形特征及其与冲蚀深度的关系，研究了草本植物对沟道冲蚀的影响及分形特征。结果表明：冲蚀沟呈中间深两侧浅的“U”形；根系分布角度相近时，根系横向长度越大，则深度越大，横向长度相近时，角度越大则深度越大，根系较长时，根系角度随横向长度增长变化越快，根系影响范围越大；距离草本植物越远冲蚀深度越大，明显影响范围为20 cm;分维值和冲蚀深度整体呈负相关关系，分维值越小，冲蚀深度越大，分维值越大，冲蚀深度越小。研究结果可为泥石流形成机制、起动条件及生物防治措施提供参考依据。

In order to study the restraining mechanism of herbaceous plants on mudflow, on the basis of the field investigation of the mudflow gully, the characteristics of herbaceous plants, the relationship between herbaceous plants and erosion, the fractal characteristics of erosion and the relationship with the depth of erosion were analyzed by using quantitative measurement method, formula calculation method, statistical graphic method and fractal method, and the influence of herbaceous plants on the erosion of the gully and its fractal characteristics were investigated.The results showed that the erosion gully was “U”-shaped with the middle deep and two sides shallow.When the root distribution angle was similar, the larger the lateral length of the root system was, the greater the depth was; when the lateral length was similar, the larger the angle was, the greater the depth was, when the root system was long, the angle of the root system was changing faster with the growth of the lateral length.The further the distance from the herbaceous plants, the greater the depth of erosion, with an obvious range of influence of 20 cm.The fractal dimension value and the depth of erosion were negatively correlated, the smaller the fractal dimension value, the greater the depth of erosion.The overall negative correlation between fractal values and erosion depth was observed, the smaller the fractal values, the larger the erosion depth the larger the fractal values, the smaller the erosion depth was.The results of the study can provide reference for the initiation of mudflow formation and biological control measures.