草本植物根系的生长形态及其对土壤的机械加固作用对防止水土流失具有积极作用。草本植物的根随着生育期的增加而生长，从而导致不同生育期的根系几何形状和机械加固方式不同。为探究不同生长期草本植物根系特征的差异及其对土壤加固的影响，以藜和狗尾草两种草本植物为研究对象。, 被作为研究对象。首先通过像素换算测量两个草本植物根系在每个生长期的直径，然后计算根面积比（RAR），并用拉力计测量每个生长期根系的拉力. 将测量结果代入Wu-Waldron模型(WWM)，并通过直剪试验对WWM进行修正。修改后的WWM用于计算不同生长期根系的机械加固效果。其次，计算了两种草本植物在不同生长期的平均根面积比（ARAR）和平均根附加内聚力（Ac r ）。最后，为了表征草本植物根系在不同生长期的加固效果，FLAC3D用于模拟根土复合材料在无侧限压缩状态下的抗压强度。结果表明，藜和狗尾草的RAR随着生长期的增加而增加，78d后RAR的标准差高于前期。藜14d和狗尾草21d根系拉力最小，继续生长7d后根系拉力明显增加，进一步生长效果不明显。藜与狗尾草的根系附加凝聚随着生长期的增加而波动。藜和狗尾草的ARAR和Ac r随着生长期的增加而增加，呈显着正相关（p < 0.01）。随着生长期的增加，根土复合材料的抗压强度呈线性增加。当草本植物生长至131d时，藜和狗尾草根土复合体的抗压强度较无根土壤分别提高了24%和21%。该研究可为利用草本植物根系的机械加固作用抑制水土流失的研究提供参考。

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The growth form of herbaceous plant roots and their mechanical reinforcement effect on soil play a positive role in preventing soil erosion. Herbaceous plant roots grow with increasing growth periods, thus resulting in different root geometry and mechanical reinforcement in different growth periods. To explore the difference in root system characteristics of herbaceous plants and their effect on soil reinforcement in different growth periods, two herbaceous plants, Chenopodium album, and Setaria viridis, were taken as the research objects. First, the diameters of the two herbaceous plant roots in each growth period were measured by pixel conversion, and then the root area ratio (RAR) was calculated, and the tensile force of the roots in each growth period was measured with a tensile force meter. The measurement results were substituted into the Wu-Waldron model (WWM), and the WWM was corrected by the direct shear test. The modified WWM was used to calculate the mechanical reinforcement effect of roots at different growth periods. Second, the average root area ratio (ARAR) and the average root additional cohesion (Acr) in different growth periods of the two herbaceous plants were calculated. Finally, to characterize the reinforcement effect of herbaceous plant roots in different growth periods, FLAC3D was used to simulate the compressive strength of the root-soil composite in the unconfined compressive state. The results showed that the RAR of Chenopodium album and Setaria viridis increased with the increase of the growth period, and the standard deviation of RAR after 78d was higher than that in the previous period. The root tensile force of Chenopodium album on 14d and Setaria viridis on 21d was the smallest, and the tensile force of roots increased significantly after continued growth for 7d, and the effect of further growth was not obvious. The root additional cohesion of Chenopodium album and Setaria viridis fluctuated with increasing growth periods. The ARAR and Acr of Chenopodium album and Setaria viridis increased with the increase of the growth period and showed a significant positive correlation (p