Vegetation effectively prevents soil erosion; however, little information is available on the effects of plant stems on sediment transport capacity. The purposes of this study were to investigate the effects of plant stem arrangement patterns on sediment transport capacity and to quantify this relationship. Artificial plant stems (stem diameter, 0.01 m) were arranged in five patterns: tessellated, random, bead, zigzag, and banding. Two discharges, two slope gradients, and two plant basal cover conditions were used to conduct flume experiments. Results revealed that plant stem arrangement affected flow regime, hydraulic parameters, hydrological connectivity, and sediment transport capacity. The structural index of connectivity (i.e., the index of sediment connectivity) and the functional index of connectivity (i.e., flow velocity) were used to quantify the effects of plant stem arrangement on sediment transport capacity. The latter exhibited a significant linear function with hydraulic parameters, including flow velocity (p < .05). Unit stream power had the greatest adjusted R² value and provided the best estimation of sediment transport capacity. Plant stem arrangement did not affect the relationship between sediment transport capacity and hydraulic parameters. These results are helpful and will enhance our predictions of different plant stem arrangement effects on sediment transport capacity.

中文翻译：

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对植物茎秆布置对农田沉积物输运能力的影响

植被可有效防止水土流失；但是，关于植物茎对沉积物传输能力影响的信息很少。这项研究的目的是调查植物茎安排模式对泥沙输送能力的影响并量化这种关系。人造植物茎（茎直径0.01 m）以五种样式排列：棋盘格状，随机，珠状，锯齿形和条带状。使用两个排水口，两个坡度梯度和两个植物基层覆盖条件进行了水槽实验。结果表明，植物茎的排列会影响流态，水力参数，水文连通性和泥沙输送能力。连通性的结构性指标（即泥沙连通性的指标）和连通性的功能性指标（即 流速）用于量化植物茎排列对沉积物传输能力的影响。后者在水力参数（包括流速（p  <.05）。单位流功率具有最大的调整后的R ²值，并且提供了对泥沙输送能力的最佳估计。植物茎的布置不影响泥沙输送能力与水力参数之间的关系。这些结果是有帮助的，并且将增强我们对不同植物茎排列对沉积物传输能力的影响的预测。