Soil saturated hydraulic conductivity plays a crucial role in the fields of hydrology, geotechnical and geological engineering. This study investigated the relationship between root characteristics and soil saturated hydraulic conductivity in a grassed soil. The saturated hydraulic conductivity of soil specimens with varying soil dry densities and planting densities were experimentally determined. Root parameters of each specimen were measured, and the relationship between root parameters and soil saturated hydraulic conductivity was determined through the stepwise multiple regression analysis. Experimental results show that both soil dry density and planting density significantly influence root growth and the saturated hydraulic conductivity of the grassed soil. Root length ratio (>4 cm), root length, and root weight density exhibit a positive correlation with planting density, while root length density and root length ratio (>4 cm) are negatively correlated with dry density. Higher dry density leads to lower soil saturated hydraulic conductivity and the permeable effects become more pronounced with increased planting density. When planting density is higher, roots create more preferential flow channels in the soil, resulting in increased soil saturated hydraulic conductivity. Root length density exerts the most significant effect on soil saturated hydraulic conductivity (|r| = 0.82, p＜0.01), followed by root length ratio (>4 cm) and root weight density. This study provides insights into the relationship between root parameters and soil saturated hydraulic conductivity, and identifies key root parameters that govern the saturated hydraulic conductivity of soil. These findings hold significant implications for enhancing the understanding of slope protection using vegetation.

中文翻译：

---

草质粘土中根系特性与饱和导水率之间的关系


土壤饱和导水率在水文学、岩土工程和地质工程领域起着至关重要的作用。本研究调查了草地土壤中根系特性与土壤饱和导水率之间的关系。实验测定了不同土壤干密度和种植密度的土壤标本的饱和导水率。测定每个试件的根系参数，并通过逐步多元回归分析确定根系参数与土壤饱和导水率之间的关系。试验结果表明，土壤干密度和种植密度都显著影响根系生长和草地土壤的饱和导水率。根长比 （>4 cm）、根长和根重密度与种植密度呈正相关，而根长密度和根长比 （>4 cm） 与干密度呈负相关。较高的干密度导致较低的土壤饱和导水率，并且随着种植密度的增加，渗透效应变得更加明显。当种植密度较高时，根系在土壤中产生更优先的流道，导致土壤饱和导水率增加。根长密度对土壤饱和导水率 （|r| = 0.82， p<0.01） 影响最显著，其次是根长比 （>4 cm） 和根重密度。本研究深入了解了根系参数与土壤饱和导水率之间的关系，并确定了控制土壤饱和导水率的关键根系参数。 这些发现对于加强对利用植被保护的边坡的理解具有重要意义。